Question

我在该代码上遇到此异常。如何解决？

Excepton：

调用线程无法访问它对象，因为不同的线程拥有它

代码：

    void CamProc_NewTargetPosition(IntPoint Center, System.Drawing.Bitmap image)
    {
        IntPtr hBitMap = image.GetHbitmap();
        BitmapSource bmaps = Imaging.CreateBitmapSourceFromHBitmap(hBitMap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

        Dispatcher.BeginInvoke((Action)(() =>
        {
            labelX.Content = String.Format("X: {0}", Center.X); //OK Working
            labelY.Content = String.Format("Y: {0}", Center.Y); //OK Working
            pictureBoxMain.Source = bmaps; // THERE IS EXCEPTON
        }), DispatcherPriority.Render, null);

    }

pictureBoxMain是System.Windows.Controls.Image。

Answer 1

您可以冻结BitmapSource，以便可以从任何线程访问它：

void CamProc_NewTargetPosition(IntPoint Center, System.Drawing.Bitmap image)
    {
        IntPtr hBitMap = image.GetHbitmap();
        BitmapSource bmaps = Imaging.CreateBitmapSourceFromHBitmap(hBitMap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
        bmaps.Freeze();

        Dispatcher.BeginInvoke((Action)(() =>
        {
            labelX.Content = String.Format("X: {0}", Center.X);
            labelY.Content = String.Format("Y: {0}", Center.Y);
            pictureBoxMain.Source = bmaps;
        }), DispatcherPriority.Render, null);

    }

Answer 2

您可以按照另一个线程中的建议冻结图像，这样可以消除线程限制，但会使图像不可变。

WPF/BackgroundWorker and BitmapSource problem

WPF - 从另一个线程更新“System.Windows.Controls.Image”

2 个答案: