A sample custom title source of Silverlight Bing map


In Silverlight web page:


In the code-behind .cs file:

public class CustomTileSource : TileSource
        public CustomTileSource()
                : base(GetAbsoluteUrl("/ClientBin/Resources/{0}.png"))

        public override Uri GetUri(int x, int y, int zoomLevel)
                var quadKey = new QuadKey(x, y, zoomLevel);
                return new Uri(String.Format(this.UriFormat, quadKey.Key));

        public static string GetAbsoluteUrl(string strRelativePath)
                if (string.IsNullOrEmpty(strRelativePath))
                        return strRelativePath;

                string strFullUrl;
                if (strRelativePath.StartsWith("http:", StringComparison.OrdinalIgnoreCase)
                  || strRelativePath.StartsWith("https:", StringComparison.OrdinalIgnoreCase)
                  || strRelativePath.StartsWith("file:", StringComparison.OrdinalIgnoreCase)
                        //already absolute
                        strFullUrl = strRelativePath;
                        //relative, need to convert to absolute
                        strFullUrl = System.Windows.Application.Current.Host.Source.AbsoluteUri;
                        if (strFullUrl.IndexOf("/ClientBin") > 0)
                                strFullUrl = strFullUrl.Substring(0, strFullUrl.IndexOf("/ClientBin")) + strRelativePath;
                return strFullUrl;

The code is from here