小编Daw*_*d B的帖子

我在画布上处理鼠标事件时遇到问题.我想用鼠标绘制它,我想出了这些事件处理程序,但是当我开始绘图时它们什么都不做.

    private void paintSurface_MouseDown(object sender, MouseButtonEventArgs e)
    {
        if (e.ButtonState == MouseButtonState.Pressed)
            currentPoint = e.GetPosition(this);
    }

    private void paintSurface_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.LeftButton == MouseButtonState.Pressed)
        {
            Line line = new Line();

            line.Stroke = SystemColors.WindowFrameBrush;
            line.X1 = currentPoint.X;
            line.Y1 = currentPoint.Y;
            line.X2 = e.GetPosition(this).X;
            line.Y2 = e.GetPosition(this).Y;

            currentPoint = e.GetPosition(this);

            paintSurface.Children.Add(line);
        }
    }

你能告诉我什么缺失或者如何重写它以帮助我开始工作吗？