WP8中的字节[]到BitmapImage获得异常

Question

我有网络图片，网址是正确的，因为我可以在网络浏览器中看到它。

我将web url读入byte []并将byte []转换为BitmapImage。

但是当调试器转到“bitmapImage.SetSource（ms）;”时，它会转到例外：

StackTrace = "   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)\r\n   
at MS.Internal.XcpImports.BitmapSource_SetSource(BitmapSource bitmapSource, CValue& byteStream)\r\n   
at System.Windows.Media.Imaging.BitmapSource.SetSourceInternal(Stream streamSource)\r\n   at Sy...

在我的CollectionHttpClient.cs

中

// get image from URL
        public static async Task<Byte[]> GetImageByImageName(string ImageName)
        {
            //Uri imageServerUril = new Uri(ImageName);

            var requestMessage = new HttpRequestMessage(HttpMethod.Get, ImageName);
            var responseMessage = await client.SendAsync(requestMessage);
            var responseData = await responseMessage.Content.ReadAsByteArrayAsync();

            return responseData;

        }

在我的视图模型中

try
{
       ...........
byte[] imageByteArray = await CollectionHttpClient.GetImageByImageName(webImageUrl);

using (MemoryStream ms = new MemoryStream(imageByteArray))
                    {     
                        BitmapImage bitmapImage = new BitmapImage();
                        bitmapImage.CreateOptions = BitmapCreateOptions.DelayCreation;
                        bitmapImage.SetSource(ms); // exception occurs here
                        item.BitImage = bitmapImage;
                    }
     ............

}
catch(exception ex)
{
       ....
}