WPF拖放并发回

本文关键字：并发 拖放 WPF | 更新日期: 2023-09-27 18:35:01

我无法在WPF/C#中通过拖放开发在我的项目中应用功能，我可以向您发布我想做的代码示例，如下所示：

 <Grid x:Name="LayoutRoot">
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid x:Name="box1" Grid.Row="0" >
            <Grid Name="grid1" Background="Aqua" Margin="15"></Grid>
        </Grid>
        <Grid x:Name="box2" Grid.Row="1" >
            <Grid Name="grid2" Background="blue" Margin="15"></Grid>
        </Grid>
        <Grid x:Name="box3" Grid.Row="2" >
            <Grid Name="grid3" Background="green" Margin="15"></Grid>
        </Grid>
    </Grid>

每个网格(框(包含另一个网格，我的简单目的是将"grid1"拖到"box2"，然后自动将"grid2"转到"box1"，每次我想要拖放时都会应用此规则;网格"框"总是不可移动的。从很多天开始，我在网上查看了许多项目和库，如GongSolutions.Wpf.DragDrop，Blacklight.ShowCase.WPF等，但没有涵盖我的请求，因为在每个网格中都有许多控件绑定数据(在实际项目中应该是30个网格更多的所有控件(，然后ItemControl不能涵盖我的目的。我很容易做一个简单的拖放，但在这种情况下对我来说更复杂，那么如果您有任何建议或想法来解决这种情况，我请问你。

如果我的问题结果很奇怪，我深表歉意，因为我在 WPF 方面没有太多经验。

谢谢你的期待

WPF拖放并发回

如果我理解正确，您要做的就是在两个框之间交换网格元素。为此，您需要将Drop事件添加到框中，并将MouseMove事件添加到网格中，如下所示：

<Grid x:Name="LayoutRoot">
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid x:Name="box1" Grid.Row="0" AllowDrop="True" Drop="box_Drop" >
        <Grid Name="grid1" Background="Aqua" Margin="15" MouseMove="grid_MouseMove">
        </Grid>
    </Grid>
    <Grid x:Name="box2" Grid.Row="1" AllowDrop="True" Drop="box_Drop">
        <Grid Name="grid2" Background="blue" Margin="15" MouseMove="grid_MouseMove">
        </Grid>
    </Grid>
    <Grid x:Name="box3" Grid.Row="2" AllowDrop="True" Drop="box_Drop">
        <Grid Name="grid3" Background="green" Margin="15" MouseMove="grid_MouseMove">
        </Grid>
    </Grid>
</Grid>

接下来，添加代码来处理这些事件。

对于MouseMove ：

/// <summary>
/// MouseMove event handler
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void grid_MouseMove(object sender, MouseEventArgs e)
{
    // Get the grid that is the source of drag
    Grid selectedGrid = sender as Grid;
    if (selectedGrid != null && e.LeftButton == MouseButtonState.Pressed)
    {
        // Add that grid as drag source and data
        DragDrop.DoDragDrop(selectedGrid, selectedGrid, DragDropEffects.Move);
    }
}

对于Drop：

/// <summary>
/// Drop event handler
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void box_Drop(object sender, DragEventArgs e)
{
    // Get the selected box in which the object is being dropped
    Grid selectedBox = sender as Grid;
    if (selectedBox != null)
    {
        // Get that data that is being dropped - in this case, the grid from other box
        Grid droppedGrid = (Grid)e.Data.GetData(typeof(Grid));
        // We need to remove the dragged grid from it's source box in order to be able to add it to selected box
        Grid sourceBox = (Grid)droppedGrid.Parent;
        // Remove the dropped grid from source box
        sourceBox.Children.Remove(droppedGrid);
        // We need to remove the other grid from the selected box in order to be able to move it to source box
        // Get existing child element, the box has only one child - the grid that we need
        Grid existingChild = (Grid)selectedBox.Children[0];
        // Remove existing child grid from selected box
        selectedBox.Children.Remove(existingChild);
        // Finally, move grids to new boxes
        // Move existing child grid to source box
        sourceBox.Children.Add(existingChild);
        // Move the dropped grid to selected box
        selectedBox.Children.Add(droppedGrid);          
    }
}

现在，您应该能够在两个框之间拖动和交换网格。

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