绘制到HelixViewPort3D

Question

总是当我想从进程中导入ViewPort3D时，我得到了System.InvalidOperationException。我不明白什么？进程无法访问ui进程吗？我该如何解决这个问题？

        private void Pro_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        Random r = new Random();
        DrawSphere(counter, Colors.Red, (double)r.Next(400) / 100);
        counter++;
    }

    private void DrawSphere(int i, Color color, double radius)
    {
        SphereVisual3D sphere = new SphereVisual3D();
        sphere.Center = new Point3D(i * 5, counter * 5, 0);
        sphere.Visible = true;
        sphere.Fill = new SolidColorBrush(color);
        sphere.Radius = radius;
        viewPort.Children.Add(sphere);
    }

Answer 1

您已使用调度程序检查访问。您有2个选择： 首选：

private void Pro_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        Random r = new Random();
        Application.Current.Dispatcher.Invoke(new Action(() => DrawSphere(counter, Colors.Red, (double)r.Next(400) / 100)));
        counter++;
    }

第二个选项：

        private void Pro_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        Random r = new Random();
        DrawToViewPort(counter, Colors.Red, (double)r.Next(400) / 100);
        counter++;

    }

    private void DrawToViewPort(int i, Color color, double radius)
    {
        if (viewPort.Dispatcher.CheckAccess())
        {
            DrawSphere(i, color, radius);
        }
        else
        {
            viewPort.Dispatcher.Invoke((Action<int, Color, double>)DrawToViewPort, i, color, radius);
        }
    }