Windows phone 参数异常

Question

我收到错误，因为“System.Windows.ni.dll 中发生了 'System.ArgumentException' 类型的异常，但未在用户代码中处理”

    void Touch_FrameReported(object sender, TouchFrameEventArgs e)
    {
        int pointsNumber = e.GetTouchPoints(img1).Count; \\ I got the Exception in this Line
        TouchPointCollection pointCollection = e.GetTouchPoints(img1);

        for (int i = 0; i < pointsNumber; i++)
        {
            if (pointCollection[i].Action == TouchAction.Down)
            {
                preXArray[i] = pointCollection[i].Position.X;
                preYArray[i] = pointCollection[i].Position.Y;
            }
            if (pointCollection[i].Action == TouchAction.Move)
            {
                line = new Line();

                line.X1 = preXArray[i];
                line.Y1 = preYArray[i];
                line.X2 = pointCollection[i].Position.X;
                line.Y2 = pointCollection[i].Position.Y;

                line.Stroke = new SolidColorBrush(Colors.White);

                line.StrokeStartLineCap = PenLineCap.Round;
                line.StrokeEndLineCap = PenLineCap.Round;
                line.StrokeThickness = 20;
                img1.Children.Add(line);

                preXArray[i] = pointCollection[i].Position.X;
                preYArray[i] = pointCollection[i].Position.Y;
            }
        }
    }

如何在 Windows Phone 8 中处理此异常

Answer 1

你需要一个像这样的 catch 块的 try catch...

 try { ... }
   catch(System.ArgumentNullException ane) { ... }
   catch(System.NotSupportedException nse) { ... }
   catch(System.IO.PathTooLongException ple) { ... }
   catch(System.IO.SecurityException se) { ... }
   catch(System.ArgumentException ae) { ... }

确保您的“System.ArgumentException”是您最后的收获。如果需要，请使用上面的 4，您可能不需要路径处理程序...