无法将类型为“System.IO.UnmanagedMemoryStream”的对象强制转换为类型“System.IO.MemoryStream”。
/// <summary>
  /// Creates a new AlphaImage from the given resource name.
  /// <example>
  /// AlphaImage image = AlphaImage.CreateFromResource("AlphaMobileControls.TestApp.Resources.Wallpaper.jpg");
  /// </example>
  /// </summary>
  public static AlphaImage CreateFromResource(string imageResourceName)
  {

  return CreateFromStream((MemoryStream)Assembly.GetCallingAssembly().GetManifestResourceStream(imageResourceName));
  }

不能强转，有间接的转换方法么？求大家指点

------解决方案--------------------
不懂得