C＃位映射到位图转换出内存错误

Question

我目前正在尝试从bitmapimage转换一个大图像 - ＆gt;位图。在较小的文件上，转换效果很好，该问题源于尝试转换IS LT; 5MB的图像。进行了一些阅读后，我认为我应该使用某种缓冲区来填充位图，但不确定。正确方向的任何点都会有所帮助。谢谢！

抛出的错误消息：

'outStream.ReadTimeout' threw an exception of type 'System.InvalidOperationException'

/// <summary>
/// Convert a BitmapImage found in a Image.Source to a Bitmap
/// </summary>
/// <param name="bitmapImage"></param>
/// <returns></returns>
public static Bitmap BitmapImageToBitmap(BitmapImage bitmapImage)
{
    // Opens a stream to be used for the image conversion
    using (MemoryStream outStream = new MemoryStream())
    {
        // Grabs the encoder object to be used as a converter
        BitmapEncoder encoder = new BmpBitmapEncoder();

        // Adds the bitmap as a frame of the encoder (this adds the image as a 'page' for the bitmap image)
        BitmapFrame frame = BitmapFrame.Create(bitmapImage);
        encoder.Frames.Add(frame);

        // Saves the current set of frames (single page for now) to the stream
        encoder.Save(outStream);
        encoder.Frames.Clear();
        encoder = null;
        frame = null;
        // Initialize a new Bitmap image using the stream
        return new Bitmap(outStream);         <--- This is where the error is thrown
    }
}