ArcGIS接口详细说明之个人开发心得

1. 关于IField接口（esriGeoDatabase）3楼2. 关于IFieldEdit接口（esriGeoDatabase）4楼3. 关于IFields接口（esriGeoDatabase）5楼4. 关于IPoint接口（esriGeometry）6楼5. 关于IPointArray接口（esriGeometry）7楼6. 关于IPointCollection接口（esriGeometry）8楼 7. 关于IPolyline接口（esriGeometry）9楼8. 关于IGeometry接口（esriGeometry）10楼9.
关于IArea接口（esriGeometry）11楼10. 关于IEnvelope接口（esriGeometry）12楼11. 关于IFeature接口（esriGeoDatabase）13楼12. 关于IRow接口（esriGeoDatabase）14楼13. 关于IFeatureClass接口（esriGeoDatabase）15楼14. 关于ITable接口（esriGeoDatabase）16楼15. 关于IFeatureCursor接口（esriGeoDatabase）17楼16. 关于IQueryFilter接口（esriGeoDatabase）18楼17.
关于IFeatureLayer接口（esriCarto）19楼18. 关于IFeatureSelection接口（esriCarto）20楼19. 关于IMap接口(esriCarto) 21楼20. 关于IPropertySet接口(esriSystem) 22楼21. 关于IFeatureWorkspace接口（esriGeoDatabase）23楼22. 关于IWorkspaceEdit接口（esriGeoDatabase）24楼23. 关于IWorkspaceFactory接口（esriGeoDatabase）25楼24.
关于ITopologicalOperator接口（esriGeometry）26楼25. 创建Buffer并选择里面的要素 27楼26. Merge要素Union要素 28楼27. 怎样从Table中获取具体需求值的Row 42楼28. 怎样ZoomInCenter 43楼29. 怎样读取一个字段内的所有值 44楼30. 怎样编辑更改属性字段的值 45楼31. 怎样将MapControl中的Map复制到PageLayoutControl中 47楼32. 怎样判断是否出于编辑状态 63楼33. 怎样用点创建一个Polygon
64楼34. 怎样运用属性来计算总面积 65楼35. 关于属性域的一些心得 82楼36. 怎样实现翻折Flip方法 83楼37. 回答cumtbGIS关于ITopologicalOperator接口Clip方法的问题 87楼38. 回答机器猫FJJ关于ISpatialFilter接口方法的问题（完整函数） 91楼39. 回答网友韶华响当当关于更改符号的代码（完整函数） 100楼40. 回答网友韶华响当当关于显示属性的代码（完整函数） 101楼41. 回答gjw1015关于IFeature变量添加进List数组里的问题
112楼1. 关于IField接口（esriGeoDatabase）IField接口的第一个属性AliasName（只读，获得字段的别名）IField接口的第二个方法CheckValue（Value）（方法，对于指定的属性字段，基于字段类型判断参数值是否有效，有效，则返回True，否则返回False）例子代码： IFeatureClass pFC_SCP_PT;editPT = new FieldClass();editPT.Precision_2 = 8;editPT.Scale_2 = 3;editPT.Name_2
= “ELEV1”;editPT.Type_2 = esriFieldType.esriFieldTypeDouble;IField接口的其他属性均为只读属性，常用有Name（只读，获得字段的名称）例子代码： Dim pFields As IFieldsDim pField As IFieldDim pGeoDef As IGeometryDefDim pDomain As IDomainDim i As LongSet pFields = pFeatClass.FieldsFor i = 0 To pFields.FieldCount-
1 Set pField= pFields.Field(i) If pField.Type= esriFieldTypeGeometry Then Set pGeoDef= pField.GeometryDef Else Debug.PrintpField.AliasName Debug.PrintpField.DefaultValue Set pDomain= pField.Domain Debug.PrintpField.Editable Debug.PrintpField.IsNullable Debug.PrintpField.Length
Debug.PrintpField.Name Debug.PrintpField.Precision Debug.PrintpField.Required Debug.PrintpField.Scale Debug.PrintpField.Type Debug.PrintpField.VarType End IfNext 2. 关于IFieldEdit接口（esriGeoDatabase）所有该接口的属性均为可读可写，经常用与对新建字段的设置，因为字段一旦被设置，其基本属性就不能被更改，所以就需要该接口类型的变量去转换，方法为：IFeatureClass
pFC_SCP_PT; IFieldEdit editPT = new FieldClass(); pFC_SCP_PT.AddField((IField)editPT); 如果在vb中去编写代码，则赋值和获取均为同一属性，而在C#中，为了区分设置和获取，属性均有两个，类似于Name和Name_2，这样就可以区分了，普遍用设置的带有_2的那个属性。IFieldEdit接口的第一个属性Name （读写，设置或者获取该变量类型变量字段的名称）IFieldEdit接口的第二个属性Precision（读写，设置或者获取该变量类型变量字段的长度）IFieldEdit接口的第三个属性Scale（读写，设置或者获取该变量类型变量字段的精度）IFieldEdit接口的第四个属性Type（读写，设置或者获取该变量类型变量字段的类型）例子代码：
IFeatureClass pFC_SCP_PT;editPT = new FieldClass();editPT.Precision_2 = 8;editPT.Scale_2 = 3;editPT.Name_2 = “ELEV1”;editPT.Type_2 = esriFieldType.esriFieldTypeDouble; 3. 关于IFields接口（esriGeoDatabase）IFields接口的第一个属性Field(Index)（只读，以用于获取具体的字段，返回类型为IField）IFields接口的第二个属性FieldCount（只读，以用于获取属性的数量）利用上面两个接口并用索引去依次循环获得每一列的属性pField（Ifield接口）例子代码：
Dim i As LongDim pField As IFieldFor i = 0 To (pFields.FieldCount- 1) Set pField= pFields.Field(i) Debug.PrintpField.Name & “: ” & pField.TypeNext iIFields接口的第三个方法FindField(Name)（方法，输入想要查找的属性域字段的名称，如果有，则返回该属性域字段在此Fields的索引，没有则返回-1）例子代码：Dim i AsIntegerDim pFields
AsIFieldsDim pField AsIField’Get FieldsSet pFields = pFeatClass.Fields’Find the fieldnamed”average_income”i =pFields.FindField(“average_income”)’Set the currentfieldSet pField = pFields.Field(i)’Delete field fromfeatureclasspFeatClass.DeleteFieldpField IFields接口的第四个方法FindFieldByAliasName(Name)（方法，与第三个方法类似，此时输入的为该列属性字段的别名，此方法不经常用）例子代码：Dim
i AsIntegerDim pFields AsIFieldsDim pField AsIField’Get FieldsSet pFields = pFeatClass.Fields’Find the fieldwiththealiasname”currentpopulation”i =pFields.FindFieldByAliasName(“currentpopulation”)’Set the currentfieldSet pField = pFields.Field(i)’Delete field
fromfeatureclasspFeatClass.DeleteFieldpField 4. 关于IPoint接口（esriGeometry）IPoint接口的第一个方法PutCoords(X,Y)（方法，设置该点的坐标）或者直接调用可以读写的属性X和Y，将坐标赋值给X和Y例子代码：Dim pPoint AsIPointSet pPoint = NewPointpPoint.PutCoords100,100IPoint接口的第二个方法QueryCoords(X,Y)（方法，得到该点的坐标）例子代码：Dim
pPoint asIPointDim dX asDouble,dYasDoublepPoint.QueryCoordsdX,dYIPoint接口的第三个方法ConstrainAngle (constraintAngle, anchor, allowOpposite ) （方法，如果第三个参数allowOpposite为True，则将第二个参数anchor这个点作为一个原点，然后以第一个参数 constraintAngle为与x轴的角度，做一条直线，再将调用此参数的点向该直线做垂线并交于一个新点，并将调用此方法的点移动到该点）例子代码：’Finds
the closespointtolinefrom(0,0)withangles ‘defined by stepsofpi/4(Noteallanglesinradians) Dim pApointAsIPoint Dim pNpointAsIPoint Dim piAsDouble Dim dAngleAsDouble Dim iAsLong Set pApoint =NewPoint pi = 4 *Atn(1) dAngle = 0 pApoint.PutCoords 0,0 Set pNpoint
=NewPoint For i =0To7 pNpoint.PutCoords 1,0 dAngle = i *pi/4 pNpoint.ConstrainAngle dAngle,pApoint,True MsgBox”angle= ” & i & “*pi/4″& vbCrLf & pNpoint.X & “,”& pNpoint.Y Next iIPoint接口的第四个方法ConstrainDistance(constraintRadius, anchor ) （方法，以第二个参数anchor这个点为圆心，然后以第一个参数constraintRadius为半径做一个圆，将调用此参数的点移动到该点与圆心做线段交于该圆的交点上）例子代码：Public
Sub t_constraindistance() Dim pPointAsIPoint Dim pNPointAsIPoint Dim dRadiusAsDouble Set pPoint =NewPoint pPoint.PutCoords 0,0 Set pNPoint =NewPoint pNPoint.PutCoords 2,2 dRadius = 1.4142135623731 pNPoint.ConstrainDistance dRadius,pPoint MsgBox “Radius =”
&dRadius& ” x,y = ” &pNPoint.X& “,” & pNPoint.Y EndSub 5. 关于IPointArray接口（esriGeometry）IPointArray接口的第一个方法Add(p) （方法，向该类型的数组变量添加Point）IPointArray接口的第二个属性Count （只读，获得该数组变量中Point的个数，返回Long类型变量）IPointArray接口的第三个属性Element(Index)（只读，获得该数组变量中位于参数Index索引位置的点Point，返回一个Point类型的变量）IPointArray接口的第四个方法Insert
(Index, p ) （方法，向索引位置Index插入一个点Point）IPointArray接口的第五个方法Remove (Index ) （方法，移除索引位置Index的点Point）IPointArray接口的第六个方法RemoveAll （方法，移除所有在此数组中的点） 6. 关于IPointCollection接口（esriGeometry）IPointCollection接口的第一个方法AddPoint(inPoint [,before] [,after]) （方法，向该类型的点集变量添加Point，第一个参数为添加的Point，第二个第三个参数为可选择的参数，默认添加进点集的末尾）IPointCollection接口的第二个属性Point（i）
（只读，获得该点集变量中第i个位置的Point，返回IPoint类型变量，i从0计算开始）IPointCollection接口的第三个属性PointCount （只读，获得该点集变量中点的个数，返回Long类型变量，切记，如果一个PointCollection变量是由闭合的Geometry转换而来的话，那么点的个数比节点数多一个，因为是闭合的，所以首位节点是同一个点） 7. 关于IPolyline接口（esriGeometry）IPolyline接口的第一个属性FromPoint与ToPoint（读写，设置或者读取该点的起始点和终止点，返回都是IPoint类型的变量）IPolyline接口的第二个方法QueryFromPoint
(from )（方法，返回IPoint类型的变量到参数from）IPolyline接口的第三个方法QueryToPoint (to ) （方法，返回IPoint类型的变量到参数to） Public Sub t_ICurve_QueryPoints() Dim pIDAsNewUID pID = “esriEditor.editor” Dim pEditorAsIEditor Dim pAppAsIApplication Set pApp =MxApplication Set pEditor =pApp.FindExtensionByCLSID(pID)
If pEditor.SelectionCount<> 1 Then MsgBox”selectoneCurve” ExitSub End If Dim pEnumFeatAsIEnumFeature Dim pFeatureAsIFeature Set pEnumFeat =pEditor.EditSelection Dim pCurveAsICurve Dim pPointFromAsIPoint Dim pPointToAsIPoint Set pPointFrom =NewPoint Set pPointTo
=NewPoint Set pFeature =pEnumFeat.Next While NotpFeatureIsNothing IfpFeature.Shape.GeometryType= esriGeometryPolyline Or_ esriGeometryPolyline OresriGeometryLineThen SetpCurve =pFeature.Shape pCurve.QueryFromPoint pPointFrom pCurve.QueryToPoint pPointTo MsgBox”+++ICurveproperties…”&
vbCrLf _ & “Curve.QueryFromPoint(x,y) =” &pPointFrom.X& “,” & pPointFrom.Y &vbCrLf_ & “Curve.QueryToPoint(x,y) =” &pPointTo.X& “,” & pPointTo.Y &vbCrLf EndIf SetpFeature =pEnumFeat.Next WendEnd Sub IPolyline接口的第四个方法Generalize (maxAllowableOffset ) （方法，用道格拉斯普克发来简化polyline）IPolyline接口的第五个方法Weed
(maxAllowableOffsetFactor ) （方法，和方法Generalize类似，均为简化polyline的方法，不同的是参数。） 8. 关于IGeometry接口（esriGeometry）Public Sub t_IGeometry_polygon() Dim pIDAsNewUID pID = “esriEditor.editor” Dim pEditorAsIEditor Dim pAppAsIApplication Set pApp =Application Set pEditor
=pApp.FindExtensionByCLSID(pID) If pEditor.SelectionCount<> 1Then MsgBox”selectonepolygon” ExitSub End If Dim pEnumFeatAsIEnumFeature Dim pFeatureAsIFeature Set pEnumFeat =pEditor.EditSelection Dim pGeometryAsIGeometry Set pFeature =pEnumFeat.Next While NotpFeatureIsNothing
IfpFeature.Shape.GeometryType= esriGeometryPolygon Then（通过pFeature.Shape获得Geometry） SetpGeometry =pFeature.Shape MsgBox”+++Polygon::IGeometry properties…” &vbCrLf_ & “Dimension =” &pGeometry.Dimension& vbCrLf _ & “Geometry type =” &pGeometry.GeometryType&
vbCrLf _ & “Envelope = ” &pGeometry.Envelope.XMin& “,” & pGeometry.Envelope.YMin& “,” _ & pGeometry.Envelope.XMax &”,”& pGeometry.Envelope.YMin & vbCrLf_ & “IsEmpty = ” &pGeometry.IsEmpty& vbCrLf _ & “SpatialReference =” &pGeometry.SpatialReference.Name EndIf
SetpFeature =pEnumFeat.Next Wend EndSub IGeometry接口的第一个属性Dimension（只读，返回一个类型为esriGeometryDimension的该图形的几何维度）-1 esriGeometryNoDimension1 esriGeometry0Dimension2 esriGeometry1Dimension4 esriGeometry2Dimension5 esriGeometry25Dimension6 esriGeometry3DimensionIGeometry接口的第二个属性Extent（只读，返回一个类型为IEnvelope的该图形的几何范围的最大边框）IGeometry接口的第三个属性GeometryType（只读，返回一个类型为esriGeometryType的该图形的几何类型）esriGeometryNull
= 0esriGeometryPoint = 1esriGeometryMultipoint = 2esriGeometryPolyline = 3esriGeometryPolygon = 4esriGeometryEnvelope = 5esriGeometryPath = 6esriGeometryAny = 7esriGeometryMultiPatch = 9esriGeometryRing = 11esriGeometryLine = 13esriGeometryCircularArc = 14esriGeometryBezier3Curve
= 15esriGeometryEllipticArc = 16esriGeometryBag = 17esriGeometryTriangleStrip= 18esriGeometryTriangleFan = 19esriGeometryRay = 20esriGeometrySphere = 21 9. 关于IArea接口（esriGeometry） Public Sub t_IArea_polygon() Dim pIDAsNewUID pID = “esriEditor.editor” Dim pEditorAsIEditor
Dim pAppAsIApplication Set pApp =Application Set pEditor =pApp.FindExtensionByCLSID(pID) If pEditor.SelectionCount<> 1Then MsgBox”selectonepolygon” ExitSub End If Dim pEnumFeatAsIEnumFeature Dim pFeatureAsIFeature Dim iAsLong Set pEnumFeat =pEditor.EditSelection
Dim pAreaAsIArea Dim pCenterAsIPoint Dim pLabelAsIPoint Set pCenter =NewPoint Set pLabel =NewPoint Set pFeature =pEnumFeat.Next While NotpFeatureIsNothing IfpFeature.Shape.GeometryType= esriGeometryPolygon Then SetpArea =pFeature.Shape MsgBox”+++Polygon::IArea
properties…” &vbCrLf_ & “Area = ” &pArea.Area& vbCrLf _ & “Center.X = ” &pArea.Centroid.X& vbCrLf _ & “Center.Y = ” &pArea.Centroid.Y& vbCrLf _ & pArea.LabelPoint.X &vbCrLf_ & “LabelPoint.Y =” &pArea.LabelPoint.Y pArea.QueryCentroid pCenter pArea.QueryLabelPoint
pLabel MsgBox”+++Polygon::IArea Queries…” &vbCrLf_ & “Center = ” &pCenter.X& “,” & pCenter.Y &vbCrLf_ & “Label = ” &pLabel.X& “,” & pLabel.Y &vbCrLf EndIf SetpFeature =pEnumFeat.Next WendEnd Sub IArea接口的第一个属性Area（只读，返回一个double类型的数值，为此Area的面积）IArea接口的第二个属性Centroid（只读，返回一个IPoint类型的变量，为此Area的重心）IArea接口的第三个属性LablePoint（只读，返回一个IPoint类型的变量，为此Area的标签的位置，一般都在此Area的内部）IArea接口的第四个方法QueryCentroid
(Center ) （方法，Center参数为一个IPoint类型的变量，通过调用此方法将重心点赋值给参数Center）IArea接口的第五个方法QueryLablePoint (LablePoint ) （方法，LablePoint参数为设置IPoint类型的变量，通过调用此方法将标签点赋值给参数LablePoint） 10. 关于IEnvelope接口（esriGeometry）应用：（中心放大） Public Sub ZoomInCenter() Dim pMxDocumentAsIMxDocument
Dim pActiveViewAsIActiveView Dim pDisplayTransformAsIDisplayTransformation Dim pEnvelopeAsIEnvelope Dim pCenterPointAsIPoint Set pMxDocument =Application.Document Set pActiveView =pMxDocument.FocusMap Set pDisplayTransform= pActiveView.ScreenDisplay.DisplayTransformation
Set pEnvelope =pDisplayTransform.VisibleBounds ‘In thiscase,wecouldhavesetpEnvelopetoIActiveView::Extent ‘Set pEnvelope =pActiveView.Extent Set pCenterPoint =NewPoint pCenterPoint.x =((pEnvelope.XMax- pEnvelope.XMin) /2)+pEnvelope.XMin pCenterPoint.y =((pEnvelope.YMax-
pEnvelope.YMin) /2)+pEnvelope.YMin pEnvelope.width =pEnvelope.width/2 pEnvelope.height =pEnvelope.height/2 pEnvelope.CenterAtpCenterPoint pDisplayTransform.VisibleBounds= pEnvelope pActiveView.RefreshEnd Sub IEnvelope接口的第一个方法CenterAt(pPoint) （方法，将这个矩形的边框移动到参数pPoint的位置，但是其他属性不变，如它的Width和Height）例子代码：
‘ The example showshowtomoveanEnvelopetoanew’centerpoint(pPoint).Public Sub t_EnvCenterAt() Dim pEnv1AsIEnvelope Dim pPointAsIPoint Set pEnv1 =NewEnvelope Set pPoint =NewPoint pEnv1.PutCoords100,100,200,200 pPoint.PutCoords0,0 pEnv1.CenterAtpPoint Dim dXminAsDouble,dYminAsDouble,dXmaxAsDouble,dYmaxAsDouble
pEnv1.QueryCoordsdXmin,dYmin,dXmax,dYmax If pEnv1.IsEmptyThen MsgBox “envelopeisempty” Else MsgBox dXmin &”,”& dYmin & “,” &dXmax &”,”& dYmax End IfEnd Sub IEnvelope接口的长宽属性Height和Width属性（读写，可以通过该属性获取或设置该边框的长和宽）IEnvelope接口的4个顶点属性UpperLeft、UpperRight、LowerLeft和LowerRight（读写，返回IPoint类型的四个顶点，比直接获得最值坐标更加方便严谨）例子代码：
Private Sub Form_Load() Set m_pEnveLope =NewEnvelope Set m_pCPoint =NewPoint m_pEnveLope.XMin = 0 m_pEnveLope.YMin = 0 m_pEnveLope.XMax = 0 m_pEnveLope.YMax = 0 m_pCPoint.X = 0 m_pCPoint.Y = 0 Set m_pLowerLeft =NewPoint Set m_pLowerRight =NewPoint Set m_pUpperLeft
=NewPoint Set m_pUpperRight =NewPoint update_props EndSub PrivateSubupdate_props() Set m_pLowerLeft =m_pEnveLope.LowerLeft edtLlx.Text = m_pLowerLeft.X edtLly.Text = m_pLowerLeft.Y Set m_pLowerRight =m_pEnveLope.LowerRight edtLrx.Text = m_pLowerRight.X edtLry.Text
= m_pLowerRight.Y Set m_pUpperLeft =m_pEnveLope.UpperLeft edtUlx.Text = m_pUpperLeft.X edtUly.Text = m_pUpperLeft.Y Set m_pUpperRight =m_pEnveLope.UpperRight edtUrx.Text = m_pUpperRight.X edtUry.Text = m_pUpperRight.Y EndSub IEnvelope接口的最值坐标属性XMax、XMin、YMax和YMin（读写，可以通过该属性获取或设置该边框的四个顶点的坐标）IEnvelope接口的第五个方法Union
(inEnvelope ) （方法，将参数输入的几何边框和调用该方法的几何边框求并集，并将结果赋值给第一个边框，即调用此方法的object）例子代码： Public Sub t_EnvUnion() Dim pEnv1AsIEnvelope Dim pEnv2AsIEnvelope Set pEnv1 =NewEnvelope Set pEnv2 =NewEnvelope pEnv1.PutCoords 100,100,200,200 pEnv2.PutCoords 150,150,250,250 pEnv1.Union
pEnv2 Dim dXminAsDouble,dYminAsDouble,dXmaxAsDouble,dYmaxAsDouble pEnv1.QueryCoords dXmin,dYmin,dXmax,dYmaxEnd Sub IEnvelope接口的第六个方法Union (inEnvelope ) （方法，返回与输入参数相交的区域的几何边框，并将结果赋值给第一个边框，即调用此方法的object）例子代码： ‘ The example showshowtointersect2envelopes.Theresultisputin’thefirstenvelope.
PublicSubt_EnvIntersect() Dim pEnv1AsIEnvelope Dim pEnv2AsIEnvelope Set pEnv1 =NewEnvelope Set pEnv2 =NewEnvelope pEnv1.PutCoords 100,100,200,200 pEnv2.PutCoords 150,150,250,250 pEnv1.Intersect pEnv2 Dim dXminAsDouble,dYminAsDouble,dXmaxAsDouble,dYmaxAsDouble
pEnv1.QueryCoords dXmin,dYmin,dXmax,dYmax If pEnv1.IsEmptyThen MsgBox”envelopeisempty” Else MsgBoxdXmin &”,”& dYmin & “,” &dXmax &”,”& dYmax End IfEnd Sub IEnvelope接口的第七个方法PutCoords (XMin, YMin,XMax,YMax) （方法，将新建的一个边框的4个极坐标设置为输入的参数）例子代码： Public Function CreateEnvXY(dblXMinAsDouble,dblYMinAsDouble,_
dblXMax As Double,dblYMaxAsDouble)AsIEnvelope Set CreateEnvXY =NewesriGeometry.Envelope CreateEnvXY.PutCoordsdblXMin,dblYMin,dblXMax,dblYMaxEnd Function IEnvelope接口的第八个方法QueryCoords (XMin, YMin,XMax,YMax)（方法，将已有的一个边框的4个极坐标输出到参数当中以备后用）IEnvelope接口的第九个方法Expand
(dx, dy, asRatio) （方法，按照输入的dx与dy参数来放大或者缩小当前的边框，用与对ArcMap窗体的中心放大或缩小，或者点击屏幕获得点击点的坐标，并将中心点设置成点击点，并进行一定比例的放大或者缩小）例子代码： Public Sub t_EnvExpand() Dim pEnv1AsIEnvelope Set pEnv1 =NewEnvelope pEnv1.PutCoords 100,100,200,200 pEnv1.Expand 0.5, 0.5,True Dim dXminAsDouble,dYminAsDouble,dXmaxAsDouble,dYmaxAsDouble
pEnv1.QueryCoords dXmin,dYmin,dXmax,dYmax If pEnv1.IsEmptyThen MsgBox”envelopeisempty” Else MsgBoxdXmin &”,”& dYmin & “,” &dXmax &”,”& dYmax End IfEnd Sub 注意！！！一般情况设置为True，来控制倍数的放大 Expand scales thesizeoftheEnvelope. IfasRatio =FALSE,theexpansionisadditive.XMin
= XMin – dxYMin = YMin – dyXMax = XMax +dxYMax = YMax +dyIf asRatio = TRUE,theexpansionismultiplicative.XMin = (XMin – dx*Width)/2YMin = (YMin – dy*Height)/2XMax = (XMax +dx*Width)/2YMax = (YMax +dy*Height)/2The Envelope remainscenteredatthesameposition. IEnvelope接口的第十个方法Offset
(X, Y)（方法，将已有的一个边框的按照输入参数的大小来进行水平竖直的移动）例子代码： Private Sub btnOffset_Click() m_pEnveLope.Offset10,20 update_propsEnd Sub注意！！！The new positionoftheEnvelopeisasfollows:newXMin = old XMin+XnewYMin =oldYMin+YnewXMax =oldXMax+XnewYMax =oldYMax+Y 11. 关于IFeature接口（esriGeoDatabase）IFeature接口的第一个属性Class（只读）IFeature接口的第二个方法Delete（方法，删除该行。因为一个Feature在表格中对应的就是一行数据，删除该行就能相应的删除这个Feature）IFeature接口的第三个属性Extent（只读，获取该Feature要素在地图上的一个矩形范围，返回值为IEnvelope类型）IFeature接口的第四个属性FeatureType（只读，获取该Feature要素的要素类型，返回值为枚举类型的esriFeatureType）IFeature接口的第五个属性Fields（只读，获取该Feature要素的字段集合，返回值为IFields类型）IFeature接口的第六个属性Shape（读写，获取该Feature要素的图形，返回值为IGeometry类型，或者各种实体化的类型，如IPolyline）IFeature接口的第七个属性ShapeCopy（只读，克隆该Feature要素的几何图形，返回值为IGeometry类型）IFeature
接口的第八个方法Store（方法，保存该行。）此属性可用于对Feature要素的几何图形进行操作，步骤如下：用IFeature.ShapeCopy方法获取一个已经存在的Geometry，或者新建一个Geometry对Geometry进行操作通过IFeature.Shape属性将Geometry写入通过IFeature.Store方法保存该Feature要素例子代码： Dim pFeature AsIFeatureDim pGeo AsIGeometrySet pGeo = pFeature.ShapeCopy’Change
the shapepFeature.Shape =pGeopFeature.Store IFeature接口的第九个属性Value（读写，利用字段的索引进行对该要素该字段的值的读写）注意，索引Index是从0开始的。object.Value(Index ) = [ value ]IFeature 接口的第十个属性Table（只读，将该行要素转换成ITable格式的数据，即可对一张表进行数据操作，具体方法查看ITable接口）例子代码： Dim pTable AsITableSet pTable = pRow.Table
12. 关于IRow接口（esriGeoDatabase）IRow接口的第一个方法Delete（方法，删除该行）IRow接口的第二个属性Fields（只读，获取该Feature要素的字段集合，返回值为IFields类型）此方法类似于IFeature接口的Fields属性IRow 接口的第三个方法Store（方法，保存该行。）此方法类似于IFeature接口的Store方法IRow接口的第四个属性Table（只读，获取该行所在的表格，返回值为ITable类型）例子代码： Dim pTable AsITableSet
pTable = pRow.Table IRow接口的第五个属性Value(Index) （读写，获取该行在参数索引的字段的值，注意，索引Index是从0开始的。）object.Value(Index ) = [ value ]IRow接口的第六个属性HasOID（只读，判断指出该行是否有OID）IRow接口的第七个属性OID（只读，获取该行的OID值）例子代码： If pRow.HasOID Then Debug.Print pRow.OIDEnd If 13. 关于IFeatureClass接口（esriGeoDatabase）
Dim pFeatcls AsIFeatureClassDim pFeatLayer AsIFeatureLayerDim pDoc AsIMxDocumentDim pMap AsIMap Set pDoc = ThisDocumentSet pMap = pDoc.Maps.Item(0)Set pFeatLayer = pMap.Layer(0)Set pFeatcls = pFeatLayer.FeatureClass IFeatureClass接口的第一个方法AddField(Field) （方法，增加一个属性字段到这个要素类，其中传入的参数为一个IField接口的变量，此变量可以由其他要素类获得并赋值给要操作的要素类，可用IFeilds接口的Field属性来获得）IFeatureClass接口的第二个方法DeleteField(Field)
（方法，删除一个属性字段，其中传入的参数为一个IField接口的变量）IFeatureClass接口的第三个属性Fields（只读，获取该要素类的全部属性字段，返回一个IFields类型的变量）例子代码： ‘Assume we haveareferencetoafeatureclass,pFCDim pFields AsIFieldsDim pField AsIFieldSet pFields = pFC.FieldsSet pField = pFields.Field(pFields.FindField(“MyField”))
pFC.DeleteFieldpField IFeatureClass接口的第四个方法FindField(Name)（方法，去查找在该要素类里面是否含有参数名字的属性字段，如果有，则返回索引，没有，则返回-1）IFeatureClass接口的第五个属性AreaField（只读，获取属性字段为geometry的那一个Field）例子代码： Dim pFeatcls AsIfeatureClassDim pFeatLayer AsIFeatureLayerDim pDoc AsIMxDocumentDim pMap
AsImap Set pDoc = ThisDocumentSet pMap = pDoc.Maps.Item(0)Set pFeatLayer = pMap.Layer(0)Set pFeatcls = pFeatLayer.FeatureClass Dim pFld AsIFieldSet pFld = pFeatcls.AreaField If Not pFldIsNothingThenMsgBox pFld.NameEnd If IFeatureClass接口的第六个方法Search (filter,
Recycling) （方法，去得到一个IFeatureCursor类型的游标，该游标由filter来控制赛选，如果filter等于null，则返回整个featureclass的游标，再用IfeatureCursor的NextFeature的方法依次得到每一个Feature）例子代码： Dim pFeatcls AsIFeatureClassDim pFeatLayer AsIFeatureLayerDim pDoc AsIMxDocumentDim pMap AsIMap Set pDoc = ThisDocumentSet
pMap = pDoc.Maps.Item(0)Set pFeatLayer = pMap.Layer(0)Set pFeatcls = pFeatLayer.FeatureClass ‘+++createthequeryfilter,andgive’+++itawhereclauseDim pQFilt AsIQueryFilterDim pFeatCur AsIFeatureCursor Set pQFilt = NewQueryFilterpQFilt.WhereClause= “subtype =
‘COM'”Set pFeatCur = pFeatcls.Search(pQFilt,False) ‘+++gettheareafieldDim pFlds AsIFieldsDim pFld AsIFieldDim lAIndex AsLong Set pFlds = pFeatcls.FieldslAIndex =pFlds.FindField(“Area”)Set pFld = pFlds.Field(lAIndex) ‘+++avariabletoholdthetotalareaDim dtotArea
AsDoubledtotArea =0# ‘+++loopthroughallofthefeaturesand’+++calculatethesumofalloftheareasDim pFeat AsIFeatureSet pFeat = pFeatCur.NextFeatureDodtotArea =dtotArea+pFeat.Value(lAIndex)Set pFeat = pFeatCur.NextFeatureLoop Until pFeatIsNothing ‘+++sendthetotalareatoamessageboxMsgBox
dtotArea IFeatureClass接口的第七个方法Insert(useBuffering) （方法， 去得到一个IFeatureCursor类型的游标，来用作插入新的Features，useBuffering是一个布尔型参数，当为True时即可以 插入新的Feature，再用IFeatureCursor的InsertFeature (buffer)的方法去插入一个新的Feature）例子代码： Dim pFeatcls AsIFeatureClassDim pFeatLayer AsIFeatureLayerDim
pDoc AsIMxDocumentDim pMap AsImap Set pDoc = ThisDocumentSet pMap = pDoc.Maps.Item(0)Set pFeatLayer = pMap.Layer(0)Set pFeatcls = pFeatLayer.FeatureClass Dim pFeatCur AsIFeatureCursorDim pFeatBuf AsIFeatureBufferDim v AsVariant Set pFeatCur = pFeatcls.Insert(True)Set
pFeatBuf = pFeatcls.CreateFeatureBufferv =pFeatCur.InsertFeature(pFeatBuf) IFeatureClass接口的第八个方法CreateFeatureBuffer（方法，新建一个缓冲，返回一个IFeatureBuffer类型的变量，然后再对这个变量进行操作）例子代码： Dim pFeatcls AsIFeatureClassDim pFeatLayer AsIFeatureLayerDim pDoc AsIMxDocumentDim pMap
AsIMap Set pDoc = ThisDocumentSet pMap = pDoc.Maps.Item(0)Set pFeatLayer = pMap.Layer(0)Set pFeatcls = pFeatLayer.FeatureClass ‘createafeaturecursorandfeaturebufferinterfaceDim pFeatCur AsIFeatureCursorDim pFeatBuf AsIFeatureBuffer ‘openthefeaturecursorandfeaturebufferSet
pFeatCur = pFeatcls.Insert(True)Set pFeatBuf = pFeatcls.CreateFeatureBuffer ‘getthelistoffieldsDim pFlds AsIFieldsDim pFld AsIFieldDim i AsLongDim pPolygon AsIPolygonDim pPolyline AsIPolylineDim pPt AsIPoint Set pPolygon = NewPolygonSet pPolyline = NewPolylineSet
pPt = NewPoint ‘findthegeometryfield,basedontheshapetype,’setthevalueforthefieldtotheappropriateobjectSet pFlds = pFeatcls.FieldsFor i = 1TopFlds.FieldCount- 1Set pFld = pFlds.Field(i)If (pFld.Type = esriFieldTypeGeometry)ThenDim pGeom AsIGeometry Select CasepFeatcls.ShapeType
CaseesriGeometryPolygon SetpGeom =pPolygon CaseesriGeometryPolyline SetpGeom =pPolyline CaseesriGeometryPoint SetpGeom =pPt End Select ‘set the valueinthefeaturebuffer pFeatBuf.Value(i) = pGeom ‘if it isnotageometrycolumn,determinewhatkindof ‘field it is,andinserttheequivalentofanullvalue
‘for that fieldtype Else IfpFld.Type =esriFieldTypeIntegerThen pFeatBuf.Value(i) = CLng(0) ElseIfpFld.Type =esriFieldTypeDoubleThen pFeatBuf.Value(i) = CDbl(0) ElseIfpFld.Type =esriFieldTypeSmallIntegerThen pFeatBuf.Value(i) = CInt(0) ElseIfpFld.Type =esriFieldTypeStringThen
pFeatBuf.Value(i) = “” Else MsgBox”Needtohandlethisfieldtype” EndIf End IfNext i ‘insertthefeaturefromthebufferintothedatabasepFeatCur.InsertFeaturepFeatBuf 14. 关于ITable接口（esriGeoDatabase）ITable是把要素类当成一个表格来看，每一列对应一个字段（Field），每一行对应一个要素（Feature），所以对要素类（IFeatureClass）接口的操作均可以类似的在Itable接口中找到。两个接口可以进行如下强制转化：VB语言Dim
pFC AsIFeatureClassDim pTable AsITableSet pTable = pFC C#语言IFeatureClass pFC;ITable pTable;pTable =(ITable)pFC; ITable接口的第一个方法AddField(Field)（方法，增加一个属性字段到这个表，其中传入的参数为一个IField接口的变量，此变量可以由其他表获得并赋值给要操作的表，可用IFeilds接口的Field属性来获得）ITable接口的第二个方法GetRow(OID) （方法，通过OID来从表格数据库中获取一行，返回一个IRow接口的变量）此方法类似于IFeatureClass接口的GetFeature方法例子代码：
Dim pWorkspace AsIWorkspaceDim pFact AsIWorkspaceFactory ‘ This example usesanSDEconnection.Thiscodeworksthe’sameforanyopenIWorkspace. Dim pPropset AsIPropertySetSet pPropset = NewPropertySetWith pPropset .SetProperty “Server”,”fred” .SetProperty “Instance”,”5203″
.SetProperty “Database”,”sdedata” .SetProperty “user”,”test” .SetProperty “password”,”test” .SetProperty “version”,”sde.DEFAULT”End WithSet pFact = NewSdeWorkspaceFactorySet pWorkspace = pFact.Open(pPropset,Me.hWnd)Dim pFeatureWorkspaceAsIFeatureWorkspaceSet
pFeatureWorkspace =pWorkspace Dim pTable AsITableSet pTable = pFeatureWorkspace.OpenTable(“Pavement”)Dim pRow AsIRowSet pRow = pTable.GetRow(59)Debug.Print pRow.Value(2) ITable接口的第三个方法GetRows(oids, Recycling) （方法，得到一个游标ICursor，通过一个oids的OID数组参数和一个Recycling的布尔类型的参数，一般为True）此方法类似于IFeatureClass接口的GetFeatures方法例子代码：
Dim iOIDList() AsLongDim iOIDListCount AsLongiOIDListCount =5 ReDim iOIDList(iOIDListCount)iOIDList(0) =1iOIDList(1) =2iOIDList(2) =3iOIDList(3) =4iOIDList(4) =50 Dim pCursor AsICursorSet pCursor = pTable.GetRows(iOIDList,True)Dim pRow AsIRowSet pRow = pCursor.NextRowWhile
Not pRowIsNothing Debug.Print pRow.Value(2) Set pRow =pCursor.NextRowWend ITable接口的第四个方法RowCount(QueryFilter) （方法，得到满足查询过滤器条件的行数。此方法IFeatureClass接口没有，所以是一个很好的有条件查询要素数量的一个方法） 15. 关于IFeatureCursor接口（esriGeoDatabase）Dim pFeatureSelectionAsIFeatureSelectionSet
pFeatureSelection =pFeatureLayerDim pSelectionSet AsISelectionSetSet pSelectionSet = pFeatureSelection.SelectionSetDim pFeatureCursor AsIFeatureCursorpSelectionSet.SearchNothing,True,pFeatureCursorDim pDataStats AsIDataStatisticsSet pDataStats = NewDataStatisticsSet
pDataStats.Cursor =pFeatureCursorpDataStats.Field =”POP1990″MsgBox pDataStats.Statistics.Mean IFeatureCursor接口的第一个方法NextFeature（方法，将游标向前跳到下一个位置，并且返回该位置的Feature）IFeatureCursor接口的第二个方法UpdateFeature(Feature) （方法，对当前游标位置的Feature进行更新）例子代码： ‘Assume we alreadyhaveareferencetoafeatureclasswiththem_pFClassvariable
Dim pFCursorAsIFeatureCursor Dim pFieldsAsIFields Dim pFeatureAsIFeature Dim iAsLong Set pFields =m_pFClass.Fields i =pFields.FindField(“NAME”) ‘Assume wehavealreadyspecifiedaqueryfilter Set pFCursor =m_pFClass.Update(pQueryFilter,False) Set pFeature =pFCursor.NextFeature
Do UntilpFeatureIsNothing ‘Update theFieldNAMEwiththevalue” Southern California” pFeature.value(i) = “Southern California” pFCursor.UpdateFeature pFeature Set pFeature =pFCursor.NextFeature Loop IFeatureCursor接口的第三个方法InsertFeature(buffer) （方法，用参数传进来的属性值插入一个新的要素到数据库中，返回该插入新的Feature的ID值，其中参数类型为IFeatureBuffer）例子代码：
Public Sub FeatureBufferCode() Dim pWorFactAsIWorkspaceFactory Dim pWorAsIWorkspace Dim pFeatWorAsIFeatureWorkspace Dim pWorEditAsIWorkspaceEdit Dim pFCAsIFeatureClass Dim pFeatureBufferAsIFeatureBuffer Dim pFeatureCursorAsIFeatureCursor Dim pFeatureAsIFeature
Dim pPolylineAsIPolyline Dim ptAsIPoint Dim qAsLong,iAsLong Set pWorFact =NewAccessWorkspaceFactory Set pWor =pWorFact.OpenFromFile(“D:\Testing\Data\GDB1.mdb”,0) Set pFeatWor =pWor Set pWorEdit =pWor Set pFC =pFeatWor.OpenFeatureClass(“casing”) pWorEdit.StartEditing
True pWorEdit.StartEditOperation SetpFeatureBuffer= pFC.CreateFeatureBuffer SetpFeatureCursor= pFC.Insert(True) SetpFeature =pFeatureBuffer SetpPolyline =NewPolyline ‘Create100featuresusingFeatureBufferandinsertintoafeaturecursor Fori =0To99 ‘Create the polylinegeometrytoassigntothenewfeature
Set pt = NewPoint pt.X = 2213300+i pt.Y = 396500+i pPolyline.FromPoint =pt Set pt = NewPoint pt.X = 2213300+i pt.Y = 396500+i pPolyline.ToPoint =pt ‘Set the feature’sshape Set pFeature.Shape = pPolyline ‘Insert the featureintothefeaturecursor q = pFeatureCursor.InsertFeature(pFeatureBuffer)
Nexti ‘Flushthefeaturecursortothedatabase pFeatureCursor.Flush pWorEdit.StopEditOperation pWorEdit.StopEditing TrueEnd Sub 16. 关于IQueryFilter接口（esriGeoDatabase）Dim pQueryFilter AsIQueryFilterSet pQueryFilter = NewQueryFilter pQueryFilter.SubFields= “STATE_NAME,POPULATION”pQueryFilter.WhereClause=
“STATE_NAME = ‘California'” Dim pFeatureCursor AsIFeatureCursorSet pFeatureCursor = pFeatureClass.Search(pQueryFilter,False)IQueryFilter接口的第一个属性WhereClause（读写，为过滤器设置条件语句）注意！各种不同的数据，设置条件查询语句的语法是不相同的，如一个shp文件在设置字段的时候要加“””双引号，而在SDE数据连接中，则什么都不加；在gdb文件的语句中，符号是“*”，而在SDE或者shp文件查询中则是“%”IQueryFilter接口的第二个属性SubFields（读写，为过滤器设置提供赛选的字段，用逗号来分隔每一个逗号，如果不设置该属性，则当做所有字段均为查找字段）
17. 关于IFeatureLayer接口（esriCarto）Sub AddLayer()’createsaFeatureLayerfromashapefileandaddstothemapinArcMap Dim pShpWksFactAsIWorkspaceFactory Dim pFeatWksAsIFeatureWorkspace Dim pFeatClassAsIFeatureClass Dim pFeatLayerAsIFeatureLayer Dim pDataSetAsIDataset Dim
pMxDocAsIMxDocument Dim pMapAsIMap Set pShpWksFact =NewShapefileWorkspaceFactory Set pFeatWks =pShpWksFact.OpenFromFile(“D:\Data\CentreCounty”,0) Set pFeatClass =pFeatWks.OpenFeatureClass(“roads”) Set pFeatLayer =NewFeatureLayer Set pFeatLayer.FeatureClass=
pFeatClass Set pDataSet =pFeatClass pFeatLayer.Name =pDataSet.Name Set pMxDoc =Application.Document Set pMap =pMxDoc.FocusMap pMap.AddLayerpFeatLayerEnd Sub IFeatureLayer接口的第一个属性FeatureClass（读写，设置或者读取此layer的要素类）IFeatureLayer接口的第二个属性MaximumScale（读写，设置或者读取此layer显示的最大比例尺）IFeatureLayer接口的第三个属性MinimumScale（读写，设置或者读取此layer显示的最小比例尺）IFeatureLayer接口的第四个方法Search
(queryFilter, recycling ) （方法，创建一个游标去查询相应设置的过滤器的查询）IFeatureLayer接口的第五个属性Visible（读写，设置或者读取此layer的可见性）IFeatureLayer接口的第六个属性AreaOfInterest（只读，读取此layer的最大范围，回返一个IEnvelope接口的变量） 18. 关于IFeatureSelection接口（esriCarto）IFeatureSelection接口的第一个方法SelectFeatures (Filter,
Method, justOne ) （方法，根据指定的标准过滤器filter和方法，选择要素，第一个参数为QueryFilter类型的变量，第二个参数为esriSelectionResultEnum类型的变量，第三个参数为布尔型变量，通常为false） 19. 关于IMap接口(esriCarto)IMap接口的第一个属性Layers (uid, recursive ) （只读，第二个参数为True的时候，该属性获取第一个参数uid指定的Layers，赋值给一个IEnumLayer的变量）例子代码：Sub
GetFeatureLayers() Dim pMxDocumentAsIMxDocument Dim pMapAsIMap Dim pEnumLayerAsIEnumLayer Dim pLayerAsILayer Dim pIdAsNewUID Set pMxDocument =Application.Document Set pMap =pMxDocument.FocusMap pId =”{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}” Set pEnumLayer =pMap.Layers(pId,True)
pEnumLayer.Reset Set pLayer =pEnumLayer.Next Do WhileNotpLayerIsNothing MsgBox pLayer.Name Set pLayer =pEnumLayer.Next LoopEnd Sub 其中比较常用的UID参数值如下： {6CA416B1-E160-11D2-9F4E-00C04F6BC78E} IDataLayer{40A9E885-5533-11d0-98BE-00805F7CED21} IFeatureLayer{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}
IGeoFeatureLayer{34B2EF81-F4AC-11D1-A245-080009B6F22B} IGraphicsLayer{5CEAE408-4C0A-437F-9DB3-054D83919850} IFDOGraphicsLayer{0C22A4C7-DAFD-11D2-9F46-00C04F6BC78E} ICoverageAnnotationLayer{EDAD6644-1810-11D1-86AE-0000F8751720} IGroupLayer IMap接口的第二个属性LayerCount（只读，返回该map里面Layer的个数）IMap接口的第三个属性Layer（Index）
（只读，返回指定索引index位置的Layer）IMap接口的第四个方法AddLayer（Layer） （方法，向该map添加一个Layer）例子代码： Public Sub AddShapeFile() Dim pWorkspaceFactoryAsIWorkspaceFactory Dim pFeatureWorkspaceAsIFeatureWorkspace Dim pFeatureLayerAsIFeatureLayer Dim pMxDocumentAsIMxDocument Dim pMapAsIMap
Set pWorkspaceFactory= New ShapefileWorkspaceFactory Set pFeatureWorkspace= pWorkspaceFactory.OpenFromFile(“d:\digitizing”,0) Set pFeatureLayer =NewFeatureLayer Set pFeatureLayer.FeatureClass= pFeatureWorkspace.OpenFeatureClass(“Parcel”) pFeatureLayer.Name=
pFeatureLayer.FeatureClass.AliasName Set pMxDocument =Application.Document Set pMap =pMxDocument.FocusMap pMap.AddLayerpFeatureLayer’alternatively,wecouldcallAddLayeronIMXDocumentEnd Sub IMap接口的第五个方法AddLayers（Layers, autoArrange） （方法，添加一个EnumLayer变量的layers到该map，第一个参数为IEnumLayer类型，第二个参数为bool型变量）IMap接口的第六个方法ClearLayers（方法，将所有的layer从map中移除）IMap接口的第七个方法ClearSelection（方法，将该map中选择的要素清空）IMap接口的第八个属性SelectionCount（只读，返回该map被选中要素的个数）IMap接口的第九个方法SelectFeature(Layer,Feature)
（方法，从一个Layer中选择一个Feature）IMap接口的第十个属性MapScale（读写，获取或者设置当前map的地图比例尺，double类型）IMap接口的第十一个方法MoveLayer(Layer,toIndex) （方法，把一个Layer从当前的位置移动到指定的索引位置）例子代码： Public Sub MoveLayer() Dim pMxDocumentAsIMxDocument Dim pMapAsIMap Dim pLayerAsILayer Set pMxDocument =Application.Document
Set pMap =pMxDocument.FocusMap Set pLayer =pMxDocument.SelectedLayer pMap.MoveLayer pLayer, pMap.LayerCount- 1End Sub IMap接口的第十二个方法SelectByShape(Shape, env, justOne) （方法，从Layer中依靠一个图形的范围shape和一个选择的环境env来选择要素，而在所有图层中只从IFeatureLayer的图层中进行选择） 20. 关于IPropertySet接口(esriSystem)IPropertySet接口的第一个方法SetProperties
(names, values ) （方法，设置属性）IPropertySet接口的第二个方法SetProperty (name, value ) （方法，设置属性）例子代码： Dim pPropset AsIPropertySetSet pPropset = NewPropertySetWith pPropset.SetProperty”Server”,m_SDEServerName.SetProperty”Instance”,m_SDEServerInst.SetProperty”user”,m_SDEServerUserName.SetProperty”password”,m_SDEServerPass.SetProperty”Database”,m_SDEDatabaseName.SetProperty”version”,m_SDEVersionNameEnd
With Dim pFactSDE AsIWorkspaceFactorySet pFactSDE = NewSdeWorkspaceFactory Dim pWorkSpaceSDE AsIWorkspaceSet pWorkSpaceSDE = pFactSDE.Open(pPropset,Me.hWnd) ‘Example of howtouseapropertysettoopenaPersonalGeodatabaseworkspace. Dim pPropset AsIPropertySetSet
pPropset = NewPropertySet pPropset.SetProperty”DATABASE”, “d:\\data\\Access Data\\First.mdb” Dim pFactAccess AsIWorkspaceFactorySet pFactAccess = NewAccessWorkspaceFactory Dim pWorkSpaceAccess AsIWorkspaceSet pWorkSpaceAccess =pFactAccess.Open(pPropset,Me.hWnd)21.
关于IFeatureWorkspace接口（esriGeoDatabase）IFeatureWorkspace接口的第一个方法OpenFeatureClass (Name) （方法，从一个要素工作空间打开一个要素，返回一个IFeatureClass类型的变量）例子代码： ‘This example opensashapefileasafeatureclass.Public Sub OpenFeatureClass_Example() Dim pWorkspaceFactoryAsIWorkspaceFactory
Set pWorkspaceFactory= New ShapefileWorkspaceFactory Dim pFeatureWorkspaceAsIFeatureWorkspace Set pFeatureWorkspace =pWorkspaceFactory.OpenFromFile(“D:\Data\Esridata\USA”, 0) Dim pFeatureClassAsIFeatureClass Set pFeatureClass =pFeatureWorkspace.OpenFeatureClass(“States”)
MsgBox “Thereare” &pFeatureClass.FeatureCount(Nothing)& ” states”End Sub 22. 关于IWorkspaceEdit接口（esriGeoDatabase）例子代码： Public Sub WorkspaceEdit() Dim pWorkspaceFactoryAsIWorkspaceFactory Set pWorkspaceFactory= New esriDataSourcesGDB.AccessWorkspaceFactory Dim
pFeatureWorkspaceAsIFeatureWorkspace Set pFeatureWorkspace = pWorkspaceFactory.OpenFromFile(“D:\Usa.mdb”,0) Dim pFeatureClassAsIFeatureClass Set pFeatureClass =pFeatureWorkspace.OpenFeatureClass(“States”) Dim pWorkspaceEditAsIWorkspaceEdit Set pWorkspaceEdit
=pFeatureWorkspace Dim pFeatureAsIFeature Dim iResponseAsInteger Dim bHasEditsAsBoolean pWorkspaceEdit.StartEditingTrue pWorkspaceEdit.StartEditOperation Set pFeature =pFeatureClass.GetFeature(1) pFeature.Delete pWorkspaceEdit.StopEditOperation iResponse =
MsgBox(“Undooperation?”, vbYesNo) If iResponse =vbYesThen pWorkspaceEdit.UndoEditOperation End If pWorkspaceEdit.HasEditsbHasEdits If bHasEditsThen pWorkspaceEdit.StopEditingMsgBox(“Save edits?”, vbYesNo) End IfEnd Sub 在实际问题中，如果有多次操作需要更改Feature的时候，切记要将操作对象重新赋值，不然在pWorkspaceEdit.StopEditing(true)的时候会出现错误，报错代码为-2147467259。（详细代码可见WindowsApplication6的代码，其中详细操作了对字段的编辑过程，其中涉及到很多对字段Field的方法
Add(Field)，Delete(Field)，get_value(object value)，set_value(intindex, object value)等等操作，其中还涉及到Feature经过ICursor类选取与经过FeatureClass类的方法GetFeature选取的区别） 23. 关于IWorkspaceFactory接口（esriGeoDatabase）IWorkspaceFactory接口的第一个方法Open (ConnectionProperties, hWnd ) （方法，从一个工作工厂打开一个工作空间，并返回IWorkspace类型的变量，方法中的第一个参数ConnectionProperties是IPropertySet接口的变量）例子代码：
Dim pSdeWorkspaceFactoryAsIWorkspaceFactoryDim pSdeWorkspace AsIWorkspaceDim pConnectionPropertiesAsIPropertySet Set pConnectionProperties =NewPropertySetWith pConnectionProperties .SetProperty”SERVER”,”Redarrow” .SetProperty”USER”,”vtest” .SetProperty”INSTANCE”,”sde4_ora”
.SetProperty”PASSWORD”,”go” .SetProperty”VERSION”,”SDE.DEFAULT”End With Set pSdeWorkspaceFactory =NewSdeWorkspaceFactorySet pSdeWorkspace = pSdeWorkspaceFactory.Open(pConnectionProperties,0) IWorkspaceFactory接口的第二个方法OpenFromFile (fileName, hWnd ) （方法，从一个路径打开一个工作空间，并返回IWorkspace类型的变量）例子代码：
Dim pSdeWorkspaceFactoryAsIWorkspaceFactoryDim pSdeWorkspace AsIWorkspace Set pSdeWorkspaceFactory =NewSdeWorkspaceFactorySet pSdeWorkspace = pSdeWorkspaceFactory.OpenFromFile(“D:\data\redarrow.sde”,0) 24. 关于ITopologicalOperator接口（esriGeometry）例子代码：Share a
linesegmentThissampleusesITopologicalOperator::Intersecttodotheequivalentofaselectbylocationwiththesharealinesegmentoperator.Public Sub ShareLineSegment() Dim pMxDocAsIMxDocument Set pMxDoc =ThisDocument Dim pMapAsIMap Set pMap =pMxDoc.FocusMap Dim pFL1AsIFeatureLayer,pFL2AsIFeatureLayer
Set pFL1 =pMap.Layer(0) ‘firstlayerofmap Set pFL2 =pMap.Layer(1) ‘secondlayer Dim pF1AsIFeature,pF2AsIFeature Set pF1 =pFL1.FeatureClass.GetFeature(1)’getfeaturewith infirstlayer’sfeatureclass Dim pfsAsIFeatureSelection Set pfs =pFL2 Dim idAsLong id =pfs.SelectionSet.IDs.Next
‘getfirstidinselectionsetanactualfunctionwouldprobablyloopovertheselection Set pF2 =pFL2.FeatureClass.GetFeature(id)’thisisline2 ‘isthereanintersectionbwthetwofeatures Dim pTopoAsITopologicalOperator Set pTopo =pF1.Shape’storetheline1shapeinthetopoop If NotpTopo.IsSimpleThenpTopo.Simplify
Dim pGeomAsIGeometry Set pGeom =pTopo.Intersect(pF2.Shape,esriGeometry1Dimension)’getintersectionwithline2 If pGeom.IsEmptyThen MsgBox “Theintersectionofthe2geometriesisemptyorconsistsofpoints” Exit Sub End If’pGeomnowcontainstheintersectionofpf1andpf2’becausedimension
=esriGeometry1Dimension’itisageometryoftypepolyline’iftheintersectionofthetwofeaturesconsistedofapointorpointspgeomwouldbeempty’wecoulduseITopologicalOperator::Intersectwith0dimensiontofindaboutthosepoints ‘ifpGeomcontainsonlytwoverticesthentheintersectionisasimplelinesegment’3verticesmeansit’sapolylinewithtwosuccessivesegments’>3
means we haveseveral segments or a polyline or a combination of these Dim ppc1AsIPointCollection Set ppc1 =pGeom Dim lAsLong,gAsLong l =ppc1.PointCount If l =2Then MsgBox “Thetwofeaturesshareasinglelinesegment” ElseIf l =3Then MsgBox “Theintersectionofthetwofeaturesisapolylineconsistingof2segments”
ElseIf l > 3 Then Dim pGeomCollAsIGeometryCollection Set pGeomColl =pGeom g = pGeomColl.GeometryCount MsgBox “Theintersectionofthetwofeaturesismadeof” &g &”polyline(s)and/orsegment(s)” End IfEnd Sub 可以将一个Polygon类型的数据或者Polyline的数据赋值给该接口的变量，如： Set pUnionedPolylines
=NewPolylineSet pTopOp = pUnionedPolylines ITopologicalOperator接口的第一个方法ConstructUnion(geometries ) （方法，合并图形的工具，输入的参数是一个IEnumGeometry类型的参数，此方法效率甚高）ITopologicalOperator接口的第二个方法Cut(cutter, leftGeom, rightGeom) （方法，剪切图形，第一个参数为剪切的线要素，为IPloyline类型，第二个第三个参数均为剪切后的图形，为输出参数）ITopologicalOperator接口的第三个方法Boundary（方法，获取一个图形的边框，一个Polygon的boundary是一个Polyline类型的要素，一个Polyline的boundary是一个nultipoint类型的要素，一个Point的boundary是为空的）ITopologicalOperator接口的第四个方法Buffer(distance)
（方法，创造一个Polygon的要素来显示缓冲区域，参数为缓冲距离）例子代码： ‘This example demonstrateshowtouseITopologicalOperator::BufferSub exampleITopologicalOperator_Buffer()Dim ptc AsIPointCollection,iAsLong,paAsIArea,ptopoAsITopologicalOperatorDim pt(4) AsIPoint,poutPolyAsIPolygonSet ptc
= NewPolygon’The spatial referenceshouldbesethereusingIGeometry::SpatialReference(Codeskippedhere)For i = 0To4 Set pt(i) =NewPointNextpt(0).PutCoords0,0pt(1).PutCoords0,10pt(2).PutCoords10,10pt(3).PutCoords10,0pt(4).PutCoords0,0ptc.AddPoints5,pt(0)Set pa =
ptcDebug.Print “Area originalpolygon: ” & pa.AreaSet ptopo = ptcSet poutPoly = ptopo.Buffer(1)’OutsidebufferSet pa = poutPolyDebug.Print “Area polygonpositivedistance: ” & pa.AreaSet poutPoly = ptopo.Buffer(-1)’InsidebufferSet pa = poutPolyDebug.Print “Area
polygonnegativedistance: ” & pa.AreaEnd Sub ITopologicalOperator接口的第五个方法Clip (clipperEnvelope ) （方法，输入一个IEnvelope类型的变量，来获取被这个边框剪切的要素，并将切割后的变量返回给调用方法的变量）ITopologicalOperator接口的第六个方法QueryClipped (clipperEnvelope, clippedGeometry ) （方法，与Clip类似，但是第二个参数为剪切后返回输出的参数，本身不会改变）ITopologicalOperator接口的第七个方法ConvexHull（方法，构造一个Geometry，大部分为Polygon类型的几何要素，该要素为调用此方法的ITopologicalOperator类型的变量最小的外边框）ITopologicalOperator接口的第八个方法SymmetricDifference
(other ) （方法，并集减去交集的部分，调用次方法的变量为第一个参数，other为第二个参数，最后返回变量到一个Geometry类型的变量，该变量的范围均在两个参数范围内，但不在两个参数相交的部分） 25. 创建Buffer并选择里面的要素===============================怎样创建buffer：（来源于管网线处理删除冗余节点）=============================== Dim pTopOper As ITopologicalOperatorSet pTopOper
= pfeature.ShapeDim pGeometry As IGeometrySet pGeometry = pTopOper.Buffer(1) (注意，这个pfeature是在前面定义的pfeature=pFeatureCursor.NextFeature,不用重新定义一个) ===============================怎样在buffer里面选择要素：===============================Dim pSpFilter AsISpatialFilterSet
pSpFilter = NewSpatialFilter Dim pTopOper AsITopologicalOperatorSet pTopOper = pfeature.ShapeDim pGeometry AsIGeometrySet pGeometry = pTopOper.Buffer(1) Set pSpFilter.Geometry =pGeometrypSpFilter.SpatialRel= esriSpatialRelContains’（esriSpatialRelContains是ISpatialFilter里面SpatialRel的一种参数esriSpatialRelEnum，值为8，代表在这个区域内包含的要素）
Set m_pSelGW_D = pLyr_Dm_pSelGW_D.SelectFeaturespSpFilter, esriSelectionResultNew, False’（m_pSelGW_D是IfeatureSelection类型的变量） pSpFilter.SpatialRel= esriSpatialRelIntersects Set m_pSelGW_X = pLyrm_pSelGW_X.SelectFeaturespSpFilter,esriSelectionResultNew,False
26. Merge要素Union要素Vb语言： Private Sub UnionSelected()Dim pMxDoc AsIMxDocumentDim pFtrLyr AsIFeatureLayerDim pFtrCls AsIFeatureClassDim pFtrSel AsIFeatureSelectionDim pFtr AsIFeatureDim pEnumGeom AsIEnumGeometryDim pEnumGeomBind AsIEnumGeometryBindDim pTopOp
AsITopologicalOperatorDim pUnionedPolylinesAsIPolyline ‘ Getareftotheselectedpolylinesinthe1stlayer Set pMxDoc =ThisDocument Set pFtrLyr =pMxDoc.FocusMap.Layer(0) Set pFtrSel =pFtrLyr Set pFtrCls =pFtrLyr.FeatureClass ‘ Createanenumerationoftheselectedpolyines
Set pEnumGeom =NewEnumFeatureGeometry Set pEnumGeomBind =pEnumGeom pEnumGeomBind.BindGeometrySource Nothing,pFtrSel.SelectionSet pEnumGeom.Reset ‘ Unionthepolylines Set pUnionedPolylines= New Polyline Set pTopOp =pUnionedPolylines pTopOp.ConstructUnion pEnumGeom
‘ Addthisnewunionedpolylinetothefeatureclass Set pFtr =pFtrCls.CreateFeature Set pFtr.Shape =pUnionedPolylines pFtr.Store End Sub C#语言：if(pFC.ShapeType== ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon){ IEnumGeometry pEnumGeom; IEnumGeometryBindpEnumGeomBind=
new EnumFeatureGeometryClass(); IFeatureLayer pLyr =newFeatureLayerClass(); pLyr.FeatureClass = pFC; IFeatureSelectionpFeatSel =(IFeatureSelection)pLyr; IQueryFilter pQfliter =newQueryFilterClass(); pQfliter.WhereClause = this.SQLText.Text; pFeatSel.SelectFeatures(pQfliter,
esriSelectionResultEnum.esriSelectionResultNew,false); pEnumGeomBind.BindGeometrySource(null,pFeatSel.SelectionSet); pEnumGeom = (IEnumGeometry)pEnumGeomBind; ITopologicalOperatorpTopo =newPolygonClass(); pTopo.ConstructUnion(pEnumGeom); pGeom = (IGeometry)pTopo;}returnpGeom;
===============================怎样从Table中获取具体需求值的Row：=============================== ITable pTable = (ITable)pFC; intindex =pTable.Fields.FindField(“FieldName”); IQueryFilter pQFilter = newQueryFilterClass(); ICursor pCur; pCur =pTable.Search(pQFilter,false);
IRow pRow = new Row(); IRow pAnswerRow = new Row(); pRow =pCur.NextRow(); while (pRow != null) { stringValue = pRow.get_Value(index).ToString(); if (Value == “Value”) { pAnswerRow = pRow; break; } pRow = pCur.NextRow(); }===============================怎样ZoomInCenter：===============================
Public Sub ZoomInCenter() Dim pMxDocumentAsIMxDocument Dim pActiveViewAsIActiveView Dim pDisplayTransformAsIDisplayTransformation Dim pEnvelopeAsIEnvelope Dim pCenterPointAsIPoint Set pMxDocument = Application.Document Set pActiveView = pMxDocument.FocusMap
Set pDisplayTransform =pActiveView.ScreenDisplay.DisplayTransformation Set pEnvelope = pDisplayTransform.VisibleBounds ‘In this case, we could have set pEnvelope toIActiveView::Extent ‘Set pEnvelope = pActiveView.Extent Set pCenterPoint = New Point pCenterPoint.x=
((pEnvelope.XMax – pEnvelope.XMin) / 2) + pEnvelope.XMin pCenterPoint.y= ((pEnvelope.YMax – pEnvelope.YMin) / 2) + pEnvelope.YMin pEnvelope.width= pEnvelope.width / 2 pEnvelope.height= pEnvelope.height / 2 pEnvelope.CenterAtpCenterPoint pDisplayTransform.VisibleBounds=
pEnvelope pActiveView.RefreshEnd Sub===============================怎样读取一个字段内的所有值：=============================== IFeatureClass pFC= m_SDEQuery.getFeatureClass();IFeatureCursor pFeaCur= pFC.Search(null, false);IFeature pFeature= pFeaCur.NextFeature(); int pFieldIndex
= pFC.Fields.FindField(this.m_cboQryFld.SelectedItem.Value.ToString()); System.Collections.ArrayListpArr = new System.Collections.ArrayList(); while (pFeature != null) { string theFieldValue = pFeature.get_Value(pFieldIndex).ToString(); if (!pArr.Contains(theFieldValue)&&
(theFieldValue.Trim() != “”)) { m_cboQryText.Items.Add(theFieldValue); pArr.Add(theFieldValue); } pFeature = pFeaCur.NextFeature(); }===============================怎样编辑更改属性字段的值：===============================IRow prow = (IRow)bendiFeatureC.GetFeature(1);MessageBox.Show(prow.Table.Fields.FieldCount.ToString());
ITable ptable = (ITable)bendiFeatureC;IQueryFilter pqfilter= new QueryFilterClass();pqfilter.WhereClause = “”dkmc”= \’北江路南郊一公里\'”; IFeatureCursor pfeatcur;pfeatcur = bendiFeatureC.Search(pqfilter, false); IFeature pfff = pfeatcur.NextFeature(); while (pfff
!= null){ IRowprrr = (IRow)pfff; prrr.set_Value(prrr.Fields.FindField(“dkmc”),”北江路南郊二公里”); pfff = (IFeature)prrr; pfff.Store(); pfff = pfeatcur.NextFeature();} ===============================怎样将MapControl中的Map复制到PageLayoutControl中===============================
Public Sub CopyAndOverwriteMap() OnErrorGoToCopyAndOverwriteMap_err DimpObjectCopyAsIObjectCopy pObjectCopy = New ObjectCopy DimpToCopyMapAsObject pToCopyMap = frmMap.AxMapControl1.Map DimpCopiedMapAsObject pCopiedMap = pObjectCopy.Copy(pToCopyMap) DimpToOverwriteMapAsObject
pToOverwriteMap =PrintPageLayout.AxPageLayoutControl1.ActiveView.FocusMap pObjectCopy.Overwrite(pCopiedMap, pToOverwriteMap) frmMap.AxMapControl1.MousePointer=ESRI.ArcGIS.Controls.esriControlsMousePointer.esriPointerArrow frmMain.StatusMessage.Text = “” PrintPageLayout.ShowDialog()
ExitSub CopyAndOverwriteMap_err: MsgBox(Err.Number& ” – ” & Err.Description,MsgBoxStyle.Critical,Application.ProductName& “- CopyMap”) ExitSubEnd Sub===============================怎样判断是否出于编辑状态：=============================== If m_pEditor.EditState =esriStateEditingThen
m_pEditor.StartOperation ‘删除冗余节点 DelSubPoint pMap m_pEditor.StopOperation”OK”End If 把m_pEditor.StartOperation放在函数里面更好 ===============================怎样用点创建一个Polygon：=============================== Dim pPnt0 asIPoint,pPnt1asIPoint,pPnt2asIPointSet pPnt0 = NewPointSet
pPnt1 = NewPointSet pPnt2 = NewPointpPnt0.PutCoordsx1,y1pPnt1.PutCoordsx2,y2pPnt2.PutCoordsx3,y3Dim pPolygon as IPointCollection(注意，这里的polygon是设置为点集的)Set pPolygon =New PolygonpPolygon.AddPointpPnt0pPolygon.AddPointpPnt1pPolygon.AddPointpPnt2pPolygon.AddPoint
pPnt0(注意，这里一定要闭合回到pPnt0才能形成一个Polygon) Set pFeature.Shape = pPolygonpFeature.Store 用这种方法可以创建一个Polyline：Dim pPolyline asIPointCollectionSet pPolyline =New LinepPolyline.AddPointpPnt0pPolyline.AddPointpPnt1pPolyline.AddPointpPnt2(这时就是一个polyline，不是闭合的) 还可以用另外一种方法，画一条两点之间的线段：Dim
pLine AsILineSet pLine = New esriGeometry.LinepLine.PutCoords pPnt0,pPnt1(第一个为from点，第二个为to点))===============================怎样运用属性来计算总面积：=============================== Dim pDoc As IMxDocumentDim pMap As IMapDim pFeatureLayer As IFeatureLayerDim pFeatureClass
As IFeatureClass Set pDoc = m_pApplication.DocumentSet pMap = pDoc.ActiveView.FocusMapSet pFeatureLayer = pMap.Layer(0)Set pFeatureClass = pFeatureLayer.FeatureClass ‘ +++ create the query filter, and give’ +++ it a where clauseDim pQueryFilt As IQueryFilterDim
pFeatureCursor As IFeatureCursor Set pQueryFilt = New QueryFilterpQueryFilt.WhereClause= “subtype = ‘COM'”Set pFeatureCursor =pFeatureClass.Search(pQueryFilt, False) ‘ +++ get the area fieldDim pFields As IFieldsDim pField As IFieldDim lAIndex As Long Set
pFields = pFeatureClass.FieldslAIndex = pFields.FindField(“Area”)Set pField = pFields.Field(lAIndex) ‘ +++ a variable to hold the total areaDim dtotArea As DoubledtotArea = 0# ‘ +++ loop through all of the features and’ +++ calculate the sum of all of the
areasDim pFeature As IFeatureSet pFeature = pFeatureCursor.NextFeatureDodtotArea = dtotArea + pFeature.Value(lAIndex)Set pFeature = pFeatureCursor.NextFeatureLoop Until pFeature Is Nothing ‘ +++ send the total area to a message boxMsgBox dtotArea ===============================关于属性域的一些心得===============================
Dim pField As IField Dim pFields As IFields Dim pFieldEdit As IFieldEdit Dim pFieldsEdit As IFieldsEdit Dim pGeometryDef As IGeometryDef Dim pGeometryDefEdit As IGeometryDefEdit Set pFields = New Fields Set pFieldsEdit = pFields pFieldsEdit.FieldCount = 35
Set pField = New Field Set pFieldEdit = pField With pFieldEdit .Name = “OBJECTID” .AliasName = “OBJECTID” .Type = esriFieldTypeOID End With Set pFieldsEdit.Field(0)= pField Set pField = New Field Set pFieldEdit = pField pFieldEdit.Name = “SHAPE” pFieldEdit.Type
= esriFieldTypeGeometry Set pGeometryDef = New GeometryDef Set pGeometryDefEdit = pGeometryDef With pGeometryDefEdit .GeometryType = esriGeometryPolygon Set .SpatialReference = New UnknownCoordinateSystem End With Set pFieldEdit.GeometryDef= pGeometryDefSet
pFieldsEdit.Field(1)= pField 个人觉得，在创建shp文件时，运用上面的方法就可以创建，但是当在GDB中创建featureclass的时候就会出现问题，有可能是空间参考的问题。所以个人觉得当在GDB中创建时，还是将已有的Ifields传进来比较保险 ===============================怎样实现翻折Flip方法：=============================== (这个过程主要运用了IPolyline和IPolygon的ReverseOrientation方法，使其翻折)Private
Sub FlipFeature(pFeature As IFeature) Dim pGeom As IGeometry If pFeature.Shape.GeometryType = esriGeometryPolyline Then Dim pPolyline As IPolyline Set pPolyline = pFeature.Shape pPolyline.ReverseOrientation Set pGeom = pPolyline ElseIf pFeature.Shape.GeometryType
= esriGeometryPolygon Then Dim pPolygon As IPolygon Set pPolygon = pFeature.Shape pPolygon.ReverseOrientation Set pGeom = pPolygon End If Set pFeature.Shape = pGeom pFeature.StoreEnd Sub 好的，没问题，这是我随便写的，希望对你有用 Dim pTopoO As ITopologicalOperator Set pTopoO =
pFeature.Shape Dim pEnv As IEnvelope Set pEnv = New Envelope pEnv.XMax = 100 pEnv.XMin = 90 pEnv.YMax = 100 pEnv.YMin = 90 pTopoO.Clip epnv pFeature.Store ===============================回答机器猫FJJ关于ISpatialFilter接口方法的问题=============================== using System;using
System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms; using ESRI.ArcGIS.Geodatabase;using ESRI.ArcGIS.Carto; namespace Solutions{ public partial class Form1 : Form { public
Form1() { InitializeComponent(); ILayer pLayer; IFeatureLayer pFeatureLayer; IFeatureClass pFeatureClass; IFeatureCursor pFeatureCursor; IFeature pFeature; ISpatialFilter pSpatialFilter; pSpatialFilter = new SpatialFilterClass(); pSpatialFilter.Geometry =
pGeom; ///这个pGeom就是传进来的参数，就是你所谓的那个“选择了地图上的一块区域” pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains; int layerCount = axMapControl1.LayerCount; for (int i = 0; i < layerCount; i++) { pLayer = axMapControl1.get_Layer(i); pFeatureLayer = (IFeatureLayer)pLayer; pFeatureClass = pFeatureLayer.FeatureClass; pFeatureCursor = pFeatureClass.Search((IQueryFilter)pSpatialFilter, false); pFeature = pFeatureCursor.NextFeature(); while (pFeature != null) { listView1.Items.Add(pLayer.Name); } } } }} ===============================回答网友韶华响当当关于更改符号的代码=============================== private void axTOC1_OnDoubleClick(object sender, ITOCControlEvents_OnDoubleClickEvent e) { esriTOCControlItem itemType = esriTOCControlItem.esriTOCControlItemNone; IBasicMap basicMap = null; ILayer layer = null; object unk = null; object data = null; axTOC1.HitTest(e.x, e.y, ref itemType, ref basicMap, ref layer, ref unk, ref data); if (e.button == 1) { if (itemType == esriTOCControlItem.esriTOCControlItemLegendClass) { //取得图例 ILegendClass pLegendClass = ((ILegendGroup)unk).get_Class((int)data); //创建符号选择器SymbolSelector实例 FormSymbolControl SymbolSelectorFrm= new FormSymbolControl(pLegendClass, layer); if (SymbolSelectorFrm.ShowDialog()== DialogResult.OK) { //局部更新主Map控件 //m_mapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null); axMap1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null); //设置新的符号 pLegendClass.Symbol = SymbolSelectorFrm.pSymbol; //更新主Map控件和图层控件 this.axMap1.ActiveView.Refresh(); this.axTOC1.Refresh(); } } } } ===============================回答网友韶华响当当关于显示属性的代码=============================== /// /// 填充DataTable中的数据 /// /// /// /// public static DataTable CreateDataTable(ILayer pLayer, string tableName) { //创建空DataTable DataTable pDataTable = CreateDataTableByLayer(pLayer, tableName); //创建DataTable的行对象 DataRow pDataRow = null; //取得图层类型 string shapeType = getShapeType(pLayer); //从ILayer查询到ITable ITable pTable = pLayer as ITable; ICursor pCursor = pTable.Search(null, false); //取得ITable中的行信息 IRow pRow = pCursor.NextRow(); int n = 0; while (pRow != null) { //新建DataTable的行对象 pDataRow = pDataTable.NewRow(); for (int i = 0; i < pRow.Fields.FieldCount; i++) { //如果字段类型为esriFieldTypeGeometry，则根据图层类型设置字段值 if (pRow.Fields.get_Field(i).Type== esriFieldType.esriFieldTypeGeometry) { pDataRow = shapeType; } //当图层类型为Anotation时，要素类中会有esriFieldTypeBlob类型的数据， //其存储的是标注内容，如此情况需将对应的字段值设置为Element else if (pRow.Fields.get_Field(i).Type== esriFieldType.esriFieldTypeBlob) { pDataRow = "Element"; } else { pDataRow= pRow.get_Value(i); } } //添加DataRow到DataTable pDataTable.Rows.Add(pDataRow); pDataRow = null; n++; pRow = pCursor.NextRow(); ////为保证效率，一次只装载最多条记录 //if (n == 2000) //{ // pRow = null; //} //else //{ // pRow = pCursor.NextRow(); //} } return pDataTable; } ===============================回答gjw1015关于IFeature变量添加进List数组里的问题=============================== ListlistFeature = new List();try{ pFC_TER_LN = pFeatureWorkspace.OpenFeatureClass("GD10K_DLG_TER_LN_l");}catch{ richTextBox1.SelectionStart =richTextBox1.Text.Length; richTextBox1.SelectedText = "地形图：" + eachFolder.Name + "中没有TER_LN_l图层！\n"; richTextBox1.Refresh(); continue;}for (int i = 0; i < pFC_TER_LN.FeatureCount([color=Red]null[/color]);i++) ///将该图层的每个Feature提取出来以供编辑时依次赋值，并且可以设置FeatureCount方法的参数为一个IQueryFilter类型的变量，就可以实现你所要求的方法了，用Search()方法，应该是不可以的，希望你们试一下。{ pFeatrue = pFC_TER_LN.GetFeature(i); listFeature.Add(pFeatrue);}
转载自：https://blog.csdn.net/sinat_32349327/article/details/52228783