拖动时将对象放在画布内

Question

我从此链接https://wpf.2000things.com/2012/12/19/715-using-the-thumb-control-to-drag-objects-on-a-canvas/中获得了以下代码

City Code

C＃

<Canvas>
    <Thumb Canvas.Left="10" Canvas.Top="20" Canvas.ZIndex="99"  DragDelta="Thumb_DragDelta">
        <Thumb.Template>
            <ControlTemplate>
                <Image Width="60" Height="60" Source="Crown.jpg"/>
            </ControlTemplate>
        </Thumb.Template>
    </Thumb>
    <Thumb Canvas.Left="100" Canvas.Top="60" DragDelta="Thumb_DragDelta">
        <Thumb.Template>
            <ControlTemplate>
                <Image Width="80" Height="100" Source="HenryII.jpg"/>
            </ControlTemplate>
        </Thumb.Template>
    </Thumb>
    <Thumb Canvas.Left="30" Canvas.Top="180" DragDelta="Thumb_DragDelta">
        <Thumb.Template>
            <ControlTemplate>
                <Label Content="Westminster, 19-Dec-1154"/>
            </ControlTemplate>
        </Thumb.Template>
    </Thumb>
</Canvas>

使用此代码，您可以将对象拖到private void Thumb_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e) { UIElement thumb = e.Source as UIElement; Canvas.SetLeft(thumb, Canvas.GetLeft(thumb) + e.HorizontalChange); Canvas.SetTop(thumb, Canvas.GetTop(thumb) + e.VerticalChange); } 上。

我不希望将对象拖到Canvas中。