保存大图

Question

谁能告诉我如何解决这个问题？

我有以下代码来保存大尺寸图像 - 我得到一个例外：

private void SaveImage(BitmapSource source, string OutPutPath)
    {
        source.Freeze();

        encoder = new JpegBitmapEncoder();
        encoder.QualityLevel = 100;
        encoder.Frames.Add(BitmapFrame.Create(source));

        Stream fileStream = File.Create(OutPutPath);

        try
        {
            encoder.Save(fileStream);
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            fileStream.Close();
            encoder = null;
        }
    }

例外是：

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

调用堆栈显示：

MS.Win32.PresentationCore.UnsafeNativeMethods.WICBitmapFrameEncode.WriteSource(SafeMILHandle THIS_PTR, SafeMILHandle pIBitmapSource, Int32Rect& r) System.Windows.Media.Imaging.BitmapEncoder.SaveFrame(SafeMILHandle frameEncodeHandle, SafeMILHandle encoderOptions, BitmapFrame frame) System.Windows.Media.Imaging.BitmapEncoder.Save(Stream stream)