WPF DragDrop 的拖放 例子

以下是一个简单的 WPF DragDrop 的拖放例子：

XAML 代码：

<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">
    <Grid>
        <ListBox x:Name="listBox" AllowDrop="True" Drop="listBox_Drop">
            <ListBoxItem>Item 1</ListBoxItem>
            <ListBoxItem>Item 2</ListBoxItem>
            <ListBoxItem>Item 3</ListBoxItem>
        </ListBox>
    </Grid>
</Window>

C# 代码：

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

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

        private void listBox_Drop(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.StringFormat))
            {
                string item = (string)e.Data.GetData(DataFormats.StringFormat);
                ListBox listBox = sender as ListBox;
                listBox.Items.Add(item);
            }
        }

        private void ListBoxItem_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                ListBoxItem listBoxItem = sender as ListBoxItem;
                DragDrop.DoDragDrop(listBoxItem, listBoxItem.Content, DragDropEffects.Copy);
            }
        }
    }
}

这个例子演示了如何在 WPF 中实现拖放操作。ListBox 控件允许拖放，当拖动 ListBoxItem 时，会将其内容拖动到 ListBox 中。