WPF:如何在Canvas中添加控件？

Question

我是如下处理的，可是不能成功添加，郁闷！public class PCBCanvas : Canvas
{
    public void AddVisual(Control control)
    {
        base.AddLogicalChild(control);
    }
    public void DeleteVisual(Control control)
    {
        base.RemoveVisualChild(control);
    }
}//添加新的按钮
private void Button_Click_1(object sender, RoutedEventArgs e)
{
    Button btn = new Button();
    btn.Content = "电压表";
    pcbCanvas.AddVisual(btn);
    PCBCanvas.SetLeft(btn, 100);
    PCBCanvas.SetTop(btn, 100);
}

Answer 1

UIElement.SetValue(Canvas.LeftProperty,100)
UIElement.SetValue(Canvas.TopProperty,100)
Canvas.Children.Add(UIElement)

Answer 2

Button btn = new Button();
btn.Content = "电压表";
btn.SetValue(Canvas.LeftProperty, 100);
btn.SetValue(Canvas.TopProperty, 100);
pcbCanvas.Children.Add(btn);报错：100不是Left属性的有效值

Answer 3

使用：Canvas.SetLeft(UIElement, 100);
     Canvas.SetTop(UIElement, 100);
可以了。。呵呵

Answer 4

UIElement.SetValue(Canvas.LeftProperty,100f)  float类型的