Question

我得到了InvalidOperationException。此代码在一个线程中运行。我已将其委托给UI线程来处理UI。问题是由于我的资源而发生的吗？

BitmapImage logo = new BitmapImage();
logo.BeginInit();
logo.UriSource = new Uri("pack://application:,,,/LiarDice;component/" + imagePath);
logo.EndInit();
currentGuessDice.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal,
new Action(delegate()
{
    currentGuessDice.Source = logo;
}));

我略微改变了我的代码，现在错误变为：

Part URI cannot end with a forward slash.

新守则：

currentGuessDice.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal,
                new Action(delegate()
                {
                    BitmapImage logo = new BitmapImage();
                    logo.BeginInit();
                    logo.UriSource = new Uri("pack://application:,,,/LiarDice;component/" + imagePath);
                    logo.EndInit();
                    currentGuessDice.Source = logo;
                }));

Answer 1

除了您的imagePath变量my null之外，原始代码中的问题是您在UI线程以外的线程中创建一个BitmapImage，然后在UI线程中使用。

为了使其正常工作，您必须冻结BitmapImage：

var logo = new BitmapImage(
    new Uri("pack://application:,,,/LiarDice;component/" + imagePath));

logo.Freeze(); // here

currentGuessDice.Dispatcher.Invoke(new Action(() => currentGuessDice.Source = logo));

InvalidOperationException委派UI线程C＃

1 个答案: