UWP 代码中有关 SoftwareBitmapSource 的异常

Question

这段代码有什么问题？

private async void FrameMonitor_PartEvent(object sender, MonitorParam monitorParam)
    {
        SoftwareBitmap bmp = new SoftwareBitmap(BitmapPixelFormat.Bgra8, (int)monitorParam.WP_FrameInfo.ImageWidth, (int)monitorParam.WP_FrameInfo.ImageHeight, BitmapAlphaMode.Ignore);
        IBuffer buffer = WindowsRuntimeBufferExtensions.AsBuffer(monitorParam.WP_FrameBytes);
        bmp.CopyFromBuffer(buffer);
        SoftwareBitmapSource bmpsource = new SoftwareBitmapSource();
        await bmpsource.SetBitmapAsync(bmp);
        await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async () =>
        {

            Img_WPImg.Source = bmpsource;           
        });
        bmp.Dispose();
    }

关于这段代码：

SoftwareBitmapSource bmpsource = new SoftwareBitmapSource();

Visual Studio 显示此异常：

System.Exception: 'The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))'

希望有高手帮帮我

Answer 1

该异常告诉我您需要从 UI 线程执行此操作，因此只需将该代码移到 Dispatcher 中，如下所示：

private async void FrameMonitor_PartEvent(object sender, MonitorParam monitorParam)
{
    SoftwareBitmap bmp = new SoftwareBitmap(BitmapPixelFormat.Bgra8, (int)monitorParam.WP_FrameInfo.ImageWidth, (int)monitorParam.WP_FrameInfo.ImageHeight, BitmapAlphaMode.Ignore);
    IBuffer buffer = WindowsRuntimeBufferExtensions.AsBuffer(monitorParam.WP_FrameBytes);
    bmp.CopyFromBuffer(buffer);
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async () =>
    {
        SoftwareBitmapSource bmpsource = new SoftwareBitmapSource();

        await bmpsource.SetBitmapAsync(bmp);

        Img_WPImg.Source = bmpsource;           
    });
    bmp.Dispose();
}

UWP 代码中有关 SoftwareBitmapSource 的异常

Exception about SoftwareBitmapSource in UWP Code

uwp

win-universal-app

uwp-xaml