Question

编辑：我简化了这个问题，因为即使是最基本的应用程序，也是在做同样的事情

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525" AllowDrop="True" >
    <Canvas DragEnter="Grid_DragEnter" Drop="Grid_Drop" AllowDrop="True" Name="C1">
        <Image Height="42" HorizontalAlignment="Left" Margin="27,28,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="42" Source="/WpfApplication1;component/Images/BackgroundMan.PNG" MouseDown="image1_MouseDown" AllowDrop="False" Canvas.Left="-15" Canvas.Top="-16" />
    </Canvas>
</Window>



namespace WpfApplication1
{
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void image1_MouseDown(object sender, MouseButtonEventArgs e)
    {
        //added a breakpoint it does fire
        //C1 is the name of the canvas
        DragDrop.DoDragDrop(C1, sender, DragDropEffects.Move);
    }

    private void Grid_DragEnter(object sender, DragEventArgs e)
    {
         //added a breakPoint it never fires
        e.Effects = DragDropEffects.Move;
    }

    private void Grid_Drop(object sender, DragEventArgs e)
    {
        //added a breakPoint it never fires
        image1.Margin = new Thickness(e.GetPosition(this).X, e.GetPosition(this).Y, 0, 0);
    }

}

}

DragEnter或Drop事件都不会触发

修改我添加了一个Window_Drop事件，这就是接受Drop事件，Anyidea为什么会这样，以及如何让Canvas接受它。我是否应该关心，我可以与之合作。

Answer 1

如果您设置了Background画笔，则会触发事件。

<Canvas Name="C1" AllowDrop="True"
        DragEnter="Grid_DragEnter" Drop="Grid_Drop"
        Background="Transparent">

Answer 2

我不完全清楚你想做什么，但在图像上将AllowDrop设置为true会导致你点击并拖动图像时触发Grid_DragEnter事件。

拖放未按预期响应

2 个答案: