wpf - 在 WPF 中以编程方式更改元素的位置

Question

没想到这个简单的事情会稍微复杂一点。我有一个 Canvas，我试图在其中动态添加 Ellipse。这是代码:

<StackPanel>

        <Canvas Name="canvas" Background="LightBlue" Margin="5" Width="250" Height="250">

        </Canvas>

        <Button Content="Draw Images" Click="Button_Click" Width="100" Margin="10" />

    </StackPanel>

这是背后的代码:

private void Button_Click(object sender, RoutedEventArgs e)
        {
            Ellipse ellipse = new Ellipse();
            ellipse.Fill = Brushes.Red;
            ellipse.Width = 10;
            ellipse.Height = 10;

            ellipse.SetValue(Canvas.LeftProperty,100);
            ellipse.SetValue(Canvas.TopProperty,100);

            canvas.Children.Add(ellipse); 


        }

出于某种原因，它会抛出 100 不是有效值的异常!

Answer 1

这是答案:

Canvas.SetLeft(ellipse,GetRandomValue());
Canvas.SetTop(ellipse,GetRandomValue());