我正在使用Windows Phone 8.1应用程序 . 我在应用程序中本地有不同的图片，并在列表视图中显示这些图片 . 现在选择一个图片ID并将其传递给详细信息屏幕，我必须保存该文件 .

我的detail.Xaml屏幕包含名为Imaged的图像控件 . 我在详细页面上获得了图像，然后按图像保存按钮 . 我正在使用这个示例应用程序https://code.msdn.microsoft.com/windowsapps/Save-Edited-Picture-16d910c4/sourcecode?fileId=119937&pathId=946309183 "Sample"

我的详细信息页面代码在这里 .

string tempimg; 
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
            var imagePath = e.Parameter as string;
            imaged.Source = new BitmapImage(new Uri(imagePath, UriKind.RelativeOrAbsolute));

            tempimg = imagePath;

    }

我的SaveImage按钮代码在这里 .

if (tempimg == null)
            return;

       // WriteableBitmap abc = new WriteableBitmap(400, 400);

        string filename = "Image-" + DateTime.Now.ToFileTime() + ".jpeg";
       // await SaveWriteableBitmapAsJpeg(img, filename);

Blockquote

await SaveWriteableBitmapAsJpeg(tempimg, filename);

private static async Task SaveWriteableBitmapAsJpeg(WriteableBitmap bmp, string fileName)
    {
        // Create file in Pictures library and write jpeg to it
        var outputFile = await KnownFolders.CameraRoll.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
        using (var writeStream = await outputFile.OpenAsync(FileAccessMode.ReadWrite))
        {
            await EncodeWriteableBitmap(bmp, writeStream, BitmapEncoder.JpegEncoderId);
        }
    }

    private static async Task EncodeWriteableBitmap(WriteableBitmap bmp, IRandomAccessStream writeStream, Guid encoderId)
    {
        // Copy buffer to pixels
        byte[] pixels;
        using (var stream = bmp.PixelBuffer.AsStream())
        {
            pixels = new byte[(uint)stream.Length];
            await stream.ReadAsync(pixels, 0, pixels.Length);
        }

        // Encode pixels into stream
        var encoder = await BitmapEncoder.CreateAsync(encoderId, writeStream);
        encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied,
           (uint)bmp.PixelWidth, (uint)bmp.PixelHeight,
           96, 96, pixels);
        await encoder.FlushAsync();
    }

我的这个函数“等待SaveWriteableBitmapAsJpeg（tempimg，filename）;”造成问题 . 我只有图像源，而需要writeablebitmap . 我只是想保存图像而不能从这里继续 . 让我知道确切的解决方案或问题 .

c# windows windows-phone-8.1 writeablebitmap