c# - C#多线程- 'System.Reflection.TargetInvocationException'

Question

几天前，我开始使用C#(WPF)进行多线程编程，这是一个我无法解决的问题...我正在使用以下代码:

    void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        Random foodPosition = new Random();
        double x,y;
        Size size = new Size(30,30);
        bool foodCreated = false;
        Ellipse food = null;
        Food foodObject = null;
        Thread foodThread = new Thread(new ThreadStart(() =>
            {
                field.Dispatcher.Invoke(new Action(() =>
                {
                    food = new Ellipse();
                    food.Fill = GenerateColor();
                    food.Width = size.Width;
                    food.Height = size.Height;
                    x = foodPosition.Next(0, (int)(playGroundSize.Width - size.Width) + 1);
                    y = foodPosition.Next(0, (int)(playGroundSize.Height - size.Height) + 1);
                    if (IsFree(x, y, size, 0))
                    {
                        playField.Children.Add(food);
                        Canvas.SetTop(food, y);
                        Canvas.SetLeft(food, x);

                        foodObject = new Food(food, new Point(x, y));
                        foodCollection.Add(foodObject,0);
                        foodCreated = true;
                    }
                }));

                if (foodCreated)
                {
                    for (int i = 0; i < foodAliveTime; i++)
                    {
                        Thread.Sleep(1000);
                        foodCollection[foodObject]++;
                    }
                    field.Dispatcher.Invoke(new Action(() =>
                    {
                        playField.Children.Remove(foodObject.FoodObject);
                        //threadList[foodObject].Abort();
                    }));
                }

            }));
        foodThread.Start();
    }

我认为问题出在上层代码。在我的程序经过大约一分钟的工作后，引发了异常。这是异常(exception):

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll

Additional information: Exception has been thrown by the target of an invocation.

之后，我收到此消息:

There is no source code available for the current location.

我知道我的源代码有点丑陋，在解决这个问题后，我将使其变得更好。您能告诉我如何解决吗？

Answer 1

我想这个问题是对的:

field.Dispatcher.Invoke

您应该将这部分代码放入try/catch块中并进行捕获

TargetInvocationException

此异常可以提供有关问题所在的更多信息(请注意其 InnerException)。

P.S.
将整个函数放入try/catch块中；并不仅捕获 TargetInvocationException，还捕获至少 System.Exception。