如何将SL的image保存到SL的独立存储文件系统

/// <summary>
         /// 将SL的image保存到独立存储文件系统
         /// TFSoft - 2011/06/07
         /// </summary>
         /// <param name="ISFileName">独立存储文件名</param>
         /// <param name="SLImage">需要保存的图片源(Silverlihgt image 组件引用)</param>
         /// <returns>无错返回空串,出错返回出错信息</returns>
         public static string ImageSave(string ISFileName, Image SLImage)
         {
             var ISAccErr = "独立存储文件系统访问失败。";
             var Rlt = "";
             var WBmp = new WriteableBitmap(SLImage.Source as BitmapSource);
             var Buf = new byte[2 * 4 + WBmp.Pixels.Length * 4];
             BitConverter.GetBytes(WBmp.PixelWidth).CopyTo(Buf, 0);
             BitConverter.GetBytes(WBmp.PixelHeight).CopyTo(Buf, 4);
             for (var I = 0; I < WBmp.Pixels.Length; I++)
             {
                 BitConverter.GetBytes(WBmp.Pixels[I]).CopyTo(Buf, I * 4 + 8);
             }
             try
             {
                 var FO = IsolatedStorageFile.GetUserStoreForApplication();
                 var FS = FO.OpenFile(ISFileName, System.IO.FileMode.OpenOrCreate);
                 FS.Write(Buf, 0, Buf.Length); FS.Close(); FS.Dispose();
             }
             catch
             {
                 Rlt = ISAccErr;
             }
             return Rlt;
         }
 
        /// <summary>
         /// 将保存在独立存储文件系统中的数据恢复到SL的image中
         /// TFSoft - 2011/06/07
         /// </summary>
         /// <param name="ISFileName">独立存储文件名</param>
         /// <param name="SLImage">恢复到图片源(Silverlihgt image 组件引用)</param>
         /// <returns>无错返回空串,出错返回出错信息</returns>
         public static string ImageRestore(string ISFileName, Image SLImage)
         {
             var ISAccErr = "独立存储文件系统访问失败。";
             var ISFileErr = "独立存储文件格式错误。";
             var Rlt = ""; var Buf = null as byte[];
             try
             {
                 var FO = IsolatedStorageFile.GetUserStoreForApplication();
                 var FS = FO.OpenFile(ISFileName, System.IO.FileMode.OpenOrCreate);
                 Buf = new byte[FS.Length]; FS.Read(Buf, 0, Buf.Length);
                 FS.Close(); FS.Dispose();
             }
             catch
             {
                 Rlt = ISAccErr;
             }
             if (Rlt == "")
             {
                 if (!(Buf.Length >= 2 * 4))
                 {
                     Rlt = ISFileErr;
                 }
                 else
                 {
                     var PixelWidth = BitConverter.ToInt32(Buf, 0);
                     var PixelHeight = BitConverter.ToInt32(Buf, 4);
                     var WBmp = new WriteableBitmap(PixelWidth, PixelHeight);
                     if (!(Buf.Length >= (2 * 4 + WBmp.Pixels.Length * 4)))
                     {
                         Rlt = ISFileErr;
                     }
                     else
                     {
                         for (var I = 0; I < WBmp.Pixels.Length; I++)
                         {
                             WBmp.Pixels[I] = BitConverter.ToInt32(Buf, I * 4 + 8);
                         }
                         SLImage.Source = WBmp;
                     }
                 }
             }
             return Rlt;
         }

1)如何将SL的image保存到SL的独立存储文件系统；

2)如何从SL的独立存储区保存的图片数据恢复到SL的image中。

如果这两个，能做到，你的要求一定能达到。无非是加一个ValueConvertor。