如何在C＃WPF中拖放兩個標簽的Exchange數據？

Question

我想做一些像我有兩個標簽的事情

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

當我在兩個交易所的文本拖動一個在B或B

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

我做了一點

主窗口

當我拖放代碼中的文本時，會在drop標簽上顯示

當我在綠色上拖動紅色時：

我的代碼：

    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

這就是我實現它的方式。

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活動

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;
}

所以基本上我創建了一個全局Label DraggingLabel來在Label_Drop中使用它來交換Text。

最終產出。

祝好運。