WriteableBitmap.SaveJpeg

Question

代码中的wb.SaveJpeg行生成错误: System.Windows.Media.Imaging.WriteableBitmap‘不包含'SaveJpeg’的定义，并且找不到接受'System.Windows.Media.Imaging.WriteableBitmap‘类型的第一个参数的扩展方法'SaveJpeg’

我已经包含了PresentationCore、PresentaionFramework、System.Windows.Forms、WindowsBase作为参考。

BitmapImage image = CaptureImageFromClipBoard();
WriteableBitmap wb = new WriteableBitmap(image);

using (var isf = IsolatedStorageFile.GetUserStoreForApplication())
{
    using (var fs = isf.CreateFile(path + "\\" + filename + ".jpg"))
    {   
        wb.SaveJpeg(fs, wb.PixelWidth, wb.PixelHeight, 10, 100);
    }
}

下面是CaptureImageFromClipBoard方法：

static public BitmapImage CaptureImageFromClipBoard()
{
    var img = new System.Windows.Controls.Image();
    var imgsrc = Clipboard.GetImage();
    img.Source = new FormatConvertedBitmap(imgsrc, PixelFormats.Bgr32, null, 0);

    JpegBitmapEncoder encoder = new JpegBitmapEncoder();
    MemoryStream memoryStream = new MemoryStream();
    BitmapImage bImg = new BitmapImage();

    encoder.Frames.Add(BitmapFrame.Create(imgsrc));
    encoder.Save(memoryStream);

    bImg.BeginInit();
    bImg.StreamSource = new MemoryStream(memoryStream.ToArray());
    bImg.EndInit();

    memoryStream.Close();

    return bImg;
}

Answer 1

我建议这样做-注意:未经测试，从内存和原始帖子键入...

static public void SaveCapturedImageFromClipBoard(Stream target)
{
    var img = new System.Windows.Controls.Image();
    var imgsrc = Clipboard.GetImage();
    img.Source = new FormatConvertedBitmap(imgsrc, PixelFormats.Bgr32, null, 0);

    JpegBitmapEncoder encoder = new JpegBitmapEncoder();

    encoder.Frames.Add(BitmapFrame.Create(imgsrc));
    encoder.Save(target);
}

和

using (var isf = IsolatedStorageFile.GetUserStoreForApplication())
{
     using (var fs = isf.CreateFile(path + "\\" + filename + ".jpg"))
     {
         SaveCapturedImageFromClipBoard(fs);
     }
}