using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace DragDrop
{public partial class DragDrop : Form{public string FilePath;public DragDrop(){InitializeComponent();}/// <summary>/// 获取ListBox的值。/// </summary>/// <returns></returns>public string GetListBoxItem(){string filePath = string.Empty;bool isSelected = IsListBoxSelected();if (isSelected==true){string listBoxItemValue = lbFilePath.SelectedItem.ToString();filePath = listBoxItemValue;}else{MessageBox.Show("ListBox must be selected.");}return filePath;}/// <summary>/// ListBox内的值是否被选中。/// </summary>/// <returns></returns>public bool IsListBoxSelected(){bool selected;if (lbFilePath.SelectedIndex == -1)//SelectedIndex==-1时，表示未选中任何项。
            {selected = false;}else{selected = true;}return selected;}private void lbFilePath_DragEnter(object sender, DragEventArgs e){if (e.Data.GetDataPresent(DataFormats.FileDrop)){e.Effect = DragDropEffects.All;}else{e.Effect = DragDropEffects.None;}}private void lbFilePath_DragDrop(object sender, DragEventArgs e){string[] s=(string[])e.Data.GetData(DataFormats.FileDrop,false);for (int i = 0; i < s.Length; i++){lbFilePath.Items.Add(s[i]);}}private void btnOpenFile_Click(object sender, EventArgs e){string filePath=GetListBoxItem();if (!string.IsNullOrEmpty(filePath)){System.Diagnostics.Process.Start(filePath);}}}
}