用arcgis的silverlight API连接Geoserver

        本人是silverlight和Arcgis开发的新手，最近因为项目的需要涉及到silverlight和Arcgis的相关开发。写这篇博客的目的一方面是为了总结经验，加深记忆，另一方也是为了能够和网上的高手们多交流。希望看这篇文章的朋友能够不吝赐教。谢谢！

         因为项目的成本问题，加上项目本身对功能要求并不是很高，所以我们只能用开源免费的Geoserver作为后台地图服务器。在此要感谢以下几篇博文给我的帮助。

         http://www.cnblogs.com/beniao/archive/2011/01/10/1930995.html

        
http://www.cnblogs.com/wenjl520/archive/2009/06/02/1494149.html

 写的非常好。感谢博主！

         首先，贴上我的代码：

/// <summary>
    /// 用arcgis silverlight api 连接Geoserver服务器
    /// </summary>
    public class ArcGisGeoWMSLayer : DynamicMapServiceLayer 
    {
        public static DependencyProperty URLProperty = DependencyProperty.Register("URL", typeof(string), typeof(ArcGisGeoWMSLayer),
            new PropertyMetadata("http://localhost:8080/wms", null));

        /// <summary>
        /// GeoServer URI
        /// </summary>
        public string URL
        {
            get { return (string)GetValue(URLProperty); }
            set { SetValue(URLProperty, value); }
        }

        public static DependencyProperty LayerNameProperty = DependencyProperty.Register("Layer", typeof(string), typeof(ArcGisGeoWMSLayer),
            new PropertyMetadata(string.Empty, null));

        /// <summary>
        /// Layer name
        /// </summary>
        public string Layer
        {
            get { return (string)GetValue(LayerNameProperty); }
            set
            {
                SetValue(LayerNameProperty, value);
            }
        }

        public static DependencyProperty ExtentProperty = DependencyProperty.Register("Extent", typeof(Envelope), typeof(ArcGisGeoWMSLayer),
            new PropertyMetadata(((object)new Envelope(0, 0, 0, 0)), OnExtentPropertyChanged));

        private static void OnExtentPropertyChanged(DependencyObject dp, DependencyPropertyChangedEventArgs e)
        {
            
        }

        /// <summary>
        /// 地图边界范围（从geoserver发布地图时可以获取）
        /// </summary>
        public Envelope Extent
        {
            get { return (Envelope)GetValue(ExtentProperty); }
            set
            {
                SetValue(ExtentProperty, value);
                this.FullExtent = Extent;
            }
        }

        public override void GetUrl(Envelope extent, int width, int height, OnUrlComplete onComplete)
        {
            
            int extentWKID = extent.SpatialReference.WKID;
            StringBuilder mapURL = new StringBuilder();
            mapURL.Append(URL);
            mapURL.Append("?service=WMS");
            mapURL.AppendFormat("&version={0}", "1.1.0");
            mapURL.Append("&request=GetMap");
            mapURL.AppendFormat("&layers={0}", Layer);
            mapURL.Append("&styles=");
            mapURL.AppendFormat("&bbox={0},{1},{2},{3}", extent.XMin.ToString(), extent.YMin.ToString(), extent.XMax.ToString(), extent.YMax.ToString());
            mapURL.AppendFormat("&width={0}", width);
            mapURL.AppendFormat("&height={0}", height);
            mapURL.AppendFormat("&format={0}", "image/png");

            onComplete(mapURL.ToString(), width, height, new ESRI.ArcGIS.Client.Geometry.Envelope()
            {
                XMin = extent.XMin,
                YMin = extent.YMin,
                XMax = extent.XMax,
                YMax = extent.YMax
            });
        }
    }

其实原理很简单，geoserver 发布的是未经缓存的地图服务，因此需要从DynamicMapServiceLayer继承，重写GetUrl即可。需要注意的是，在初始化类的时候，需要将地图的extent赋给FullExtent属性，否则地图无法正常显示：

前台XAML代码：

<UserControl x:Class="ArcGisSlGeoDemo.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009"
    xmlns:customLayer="clr-namespace:ArcGisSlGeoDemo"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <esri:Map x:Name="baseMap" IsLogoVisible="False">
            <customLayer:ArcGisGeoWMSLayer URL="http://localhost:8080/geoserver/wms" Layer="JianxiYP:JiangxiYP" ID="geoLayer"></customLayer:ArcGisGeoWMSLayer>
        </esri:Map>
    </Grid>
</UserControl>

注意要给Extent赋值，这个是地图边界范围，在geoserver发布地图的时候我从geoserver里面直接读取出来的边界范围。

MainPage.cs

 public MainPage()
        {
            InitializeComponent();
            Envelope extent = new Envelope(73580, 20411.591, 75418.814, 21975.971);
            extent.SpatialReference = new SpatialReference(4326);
            ArcGisGeoWMSLayer layer = this.baseMap.Layers[0] as ArcGisGeoWMSLayer;
            layer.Extent = extent;
            
      }

转载自：https://blog.csdn.net/jxzz016590/article/details/8424651