目录

WGS1984：

Beijing1954：

WGS1984：

 private void wGS1954ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ChoseLayer Choseform = new ChoseLayer();
            int layerName;

            IFeatureLayer pFeatureLayer;
            if (Choseform.ShowDialog() == DialogResult.OK)
            {
                layerName = Choseform.layerindex;
                pFeatureLayer = axMapControl1.get_Layer(layerName) as IFeatureLayer;
                try
                {
                    IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
                    IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;
                    IGeoDatasetSchemaEdit pGeoDatasetSchemaEdit = pGeoDataset as IGeoDatasetSchemaEdit;
                    if (pGeoDatasetSchemaEdit.CanAlterSpatialReference == true)
                    {
                        ISpatialReferenceFactory2 pSpaRefFactory = new SpatialReferenceEnvironmentClass();
                        IGeographicCoordinateSystem pNewGeoSys = pSpaRefFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
                        pGeoDatasetSchemaEdit.AlterSpatialReference(pNewGeoSys);
                    }
                    Choseform.Dispose();
                    MessageBox.Show("已将图层坐标系定义为WGS1984", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception Err)
                {
                    MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
        }

Beijing1954：

   private void beijing1954ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ChoseLayer Choseform = new ChoseLayer();
            int layerName;

            IFeatureLayer pFeatureLayer;
            if (Choseform.ShowDialog() == DialogResult.OK)
            {
                layerName = Choseform.layerindex;
                pFeatureLayer = axMapControl1.get_Layer(layerName) as IFeatureLayer;
                try
                {
                    IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
                    IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;
                    IGeoDatasetSchemaEdit pGeoDatasetSchemaEdit = pGeoDataset as IGeoDatasetSchemaEdit;
                    if (pGeoDatasetSchemaEdit.CanAlterSpatialReference == true)
                    {
                        ISpatialReferenceFactory2 pSpaRefFactory = new SpatialReferenceEnvironmentClass();
                        IGeographicCoordinateSystem pNewGeoSys = pSpaRefFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);
                        pGeoDatasetSchemaEdit.AlterSpatialReference(pNewGeoSys);
                    }
                    Choseform.Dispose();
                    MessageBox.Show("已将图层坐标系定义为Beijing1954", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception Err)
                {
                    MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
        }

转载自：https://blog.csdn.net/qq_40323256/article/details/85053610