WPF 实现拖放的简单实例(Drag & Drop)

概述：拖放的原理不再说明，wpf实现的简单实例

一、XAML部分

<Window x:Class="WpfDragDropGrid.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Loaded="Window_Loaded"
        Title="MainWindow" Height="450" Width="600">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="269*"/>
            <ColumnDefinition Width="11*"/>
            <ColumnDefinition Width="312*"/>
        </Grid.ColumnDefinitions>
        <DataGrid x:Name="dgRight" Margin="0" Grid.Column="2" AutoGenerateColumns="False" Drop="dgRight_Drop"
                  IsReadOnly="True" SelectionMode="Single" AllowDrop="True">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding devname}" ClipboardContentBinding="{x:Null}" Header="设备" Width="*"/>
                <DataGridTextColumn Binding="{Binding spot1}" ClipboardContentBinding="{x:Null}" Header="测点1" Width="*"/>
                <DataGridTextColumn Binding="{Binding spot2}" ClipboardContentBinding="{x:Null}" Header="测点2" Width="*"/>
                <DataGridTextColumn Binding="{Binding spot3}" ClipboardContentBinding="{x:Null}" Header="测点3" Width="*"/>
            </DataGrid.Columns>
        </DataGrid>
        <ListBox x:Name="listBox" Margin="0" Background="#FFF1EFBD" AllowDrop="True"
                 PreviewMouseLeftButtonDown="listBox_PreviewMouseLeftButtonDown"/>
    </Grid>
</Window>

二、代码部分

using System;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace WpfDragDropGrid
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        ObservableCollection<Record> recordLeftList = new ObservableCollection<Record>();
        ObservableCollection<Record> recordRightList = new ObservableCollection<Record>();
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            listBox.ItemsSource = recordLeftList;
            listBox.DisplayMemberPath = "devname";
            dgRight.ItemsSource = recordRightList;
            Random ran = new Random();
            for (int i = 0; i < 10; i++)
            {
                recordLeftList.Add(new Record() { devname="dev"+i,spot1=ran.Next(1,100),spot2=ran.Next(1,100),spot3=ran.Next(1,100)});
            }
        }

        private void listBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            Point pos = e.GetPosition(listBox);
            HitTestResult result = VisualTreeHelper.HitTest(listBox, pos);
            if (null == result) return;

            ListBoxItem listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit); // Find your actual visual you want to drag
            if (listBoxItem == null || listBoxItem.Content != listBox.SelectedItem || !(listBox.SelectedItem is Record))
                return;

            Record record = listBoxItem.Content as Record;
            DataObject dataObject = new DataObject(record);
            // Here, we should notice that dragsource param will specify on which 
            // control the drag&drop event will be fired
            System.Windows.DragDrop.DoDragDrop(listBox, dataObject, DragDropEffects.Copy);
            
        }

        private void dgRight_Drop(object sender, DragEventArgs e)
        {
            Point pos = e.GetPosition(dgRight);
            HitTestResult result = VisualTreeHelper.HitTest(dgRight, pos);
            if (result == null)
                return;

            Record sourceRecord = e.Data.GetData(typeof(Record)) as Record;
            if (sourceRecord != null)
                recordRightList.Add(sourceRecord);
        }
    }

    //工具类方法，来自网络(很通用，所以借鉴于此，多谢原创)
    internal static class Utils
    {
        //根据子元素查找父元素
        public static T FindVisualParent<T>(DependencyObject obj) where T : class
        {
            while (obj != null)
            {
                if (obj is T)
                    return obj as T;

                obj = VisualTreeHelper.GetParent(obj);
            }
            return null;
        }
    }

    //实体类
    public class Record
    {
        public string devname
        { get; set; }

        public double spot1
        { get; set; }

        public double spot2
        { get; set; }

        public double spot3
        { get; set;  }
    }
}