如何在C＃WPF中拖放两个标签的Exchange数据？

Question

我想做一些像我有两个标签的事情

A .............. ........... B.
______ ........... _______
| RED | .......... | 绿色|
---------- .......... -----------

当我在两个交易所的文本拖动一个在B或B

A .............. ........... B.
______ ............ _____
| GREEN | .......... | RED |
---------- ............... ---------

我做了一点

主窗口

当我拖放代码中的文本时，会在drop标签上显示

当我在绿色上拖动红色时：

我的代码：

    private void Label_MouseDown(object sender, MouseButtonEventArgs e)
    {
        Label lblFrom = e.Source as Label;


        if (e.LeftButton == MouseButtonState.Pressed)
            DragDrop.DoDragDrop(lblFrom, lblFrom.Content, DragDropEffects.Copy);
    }

    private void Label_QueryContinueDrag(object sender, QueryContinueDragEventArgs e)
    {
        Label lblFrom = e.Source as Label;

        if (!e.KeyStates.HasFlag(DragDropKeyStates.LeftMouseButton))
            lblFrom.Content = "RED";

    }

    private void Label_Drop(object sender, DragEventArgs e)
    {
        string draggedText = (string)e.Data.GetData(DataFormats.StringFormat);

        Label toLabel = e.Source as Label;
        toLabel.Content = draggedText;
    }
}

Answer 1

这就是我实现它的方式。

以下是我的XAML。

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Label Width="50" Height="50" Background="Red" Content="Red" HorizontalAlignment="Center" VerticalAlignment="Center" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" MouseDown="Label_MouseDown" Drop="Label_Drop" AllowDrop="True"/>
    <Label Width="50" Height="50" Background="Green" Content="Green" HorizontalAlignment="Center" VerticalAlignment="Center" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Grid.Column="1" MouseDown="Label_MouseDown" Drop="Label_Drop" AllowDrop="True"/>
</Grid>

以下是我的CodeBehind活动

Label DraggingLabel;
private void Label_MouseDown(object sender, MouseButtonEventArgs e)
{
    DraggingLabel = sender as Label;
    if (e.LeftButton == MouseButtonState.Pressed)
        DragDrop.DoDragDrop(DraggingLabel, DraggingLabel.Content, DragDropEffects.Copy);
}

private void Label_Drop(object sender, DragEventArgs e)
{
    Label originalsource = e.OriginalSource as Label;
    Label lblToDrop = sender as Label;
    string fromContent = lblToDrop.Content.ToString();
    lblToDrop.Content = (string)e.Data.GetData(DataFormats.StringFormat);
    DraggingLabel.Content = fromContent;
}

所以基本上我创建了一个全局Label DraggingLabel来在Label_Drop中使用它来交换Text。

最终产出。

祝好运。