arcgis api for silverlight自己写个图层，实现对google map的访问

arcgis api for silverlight 中的ArcGISTiledMapServiceLayer图层，继承自TiledMapServiceLayer。如果想实现自己的缓存地图图层，继承它并重载GetTileUrl方法就可以。arcgis api for silverlight 内部会计算当前访问的缩放等级level，切片二维编号row，col。这些参数暴露给GetTileUrl方法，在这个方法里面设置访问google静态地图的URL地址。

public class GoogleMapLayer : TiledMapServiceLayer
    {
        private const double cornerCoordinate = 20037508.3427892;
        public override void Initialize()
        {
            this.FullExtent = new ESRI.ArcGIS.Client.Geometry.Envelope(-20037508.3427892,-20037508.3427892,20037508.3427892,20037508.3427892)
            {
                SpatialReference = new SpatialReference(102100)
            };
            // This layer's spatial reference
            this.SpatialReference = new SpatialReference(102100);
            // Set up tile @R_992_4045@ion. Each tile is 256x256px,19 levels.
            this.TileInfo = new TileInfo()
            {
                Height = 256,
                Width = 256,
                Origin = new MapPoint(-cornerCoordinate,cornerCoordinate) { SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(102100) },
                Lods = new Lod[19]
            };
            // Set the resolutions for each level. Each level is half the resolution of the prevIoUs one.
            double resolution = cornerCoordinate * 2 / 256;
            for (int i = 0; i < TileInfo.Lods.Length; i++)
            {
                TileInfo.Lods[i] = new Lod() { Resolution = resolution };
                resolution /= 2;
            }
            // Call base initialize to raise the initialization event
            base.Initialize();
        }

        public override string GetTileUrl(int level,int row,int col)
        {
            string baseUrl = "http://mt2.google.cn/vt/v=w2.116&hl=zh-CN&gl=cn&x={0}&y={1}&z={2}&s=G";

            return string.Format(baseUrl,col,row,level);
        }
    }

 

 也可下载http://download.csdn.net/detail/leesmn/3634647试试效果