form1.cs

《c#技术内幕代码》

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace CH13_6
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ListView listView1;
		private System.Windows.Forms.ListView listView2;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			System.Windows.Forms.ListViewItem listViewItem1 = new System.Windows.Forms.ListViewItem("List 2 Item 1");
			System.Windows.Forms.ListViewItem listViewItem2 = new System.Windows.Forms.ListViewItem("List 2 Item 2");
			System.Windows.Forms.ListViewItem listViewItem3 = new System.Windows.Forms.ListViewItem(" List 2 Item 3");
			System.Windows.Forms.ListViewItem listViewItem4 = new System.Windows.Forms.ListViewItem("Item 1");
			System.Windows.Forms.ListViewItem listViewItem5 = new System.Windows.Forms.ListViewItem("Item 2");
			System.Windows.Forms.ListViewItem listViewItem6 = new System.Windows.Forms.ListViewItem("Item 3");
			this.listView2 = new System.Windows.Forms.ListView();
			this.listView1 = new System.Windows.Forms.ListView();
			this.SuspendLayout();
			// 
			// listView2
			// 
			this.listView2.AllowDrop = true;
			listViewItem1.UseItemStyleForSubItems = false;
			listViewItem2.UseItemStyleForSubItems = false;
			listViewItem3.UseItemStyleForSubItems = false;
			this.listView2.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
																					  listViewItem1,
																					  listViewItem2,
																					  listViewItem3});
			this.listView2.Location = new System.Drawing.Point(320, 24);
			this.listView2.Name = "listView2";
			this.listView2.Size = new System.Drawing.Size(200, 216);
			this.listView2.TabIndex = 1;
			this.listView2.View = System.Windows.Forms.View.List;
			this.listView2.DragDrop += new System.Windows.Forms.DragEventHandler(this.OnDragDrop);
			this.listView2.DragEnter += new System.Windows.Forms.DragEventHandler(this.OnDragEnter);
			// 
			// listView1
			// 
			this.listView1.AllowDrop = true;
			listViewItem4.UseItemStyleForSubItems = false;
			listViewItem5.UseItemStyleForSubItems = false;
			listViewItem6.UseItemStyleForSubItems = false;
			this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
																					  listViewItem4,
																					  listViewItem5,
																					  listViewItem6});
			this.listView1.Location = new System.Drawing.Point(40, 24);
			this.listView1.Name = "listView1";
			this.listView1.Size = new System.Drawing.Size(200, 216);
			this.listView1.TabIndex = 0;
			this.listView1.View = System.Windows.Forms.View.List;
			this.listView1.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.OnItemDrag);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(576, 273);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.listView2,
																		  this.listView1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void OnItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
		{
			string s = e.Item.ToString(); 
			// Start the Drag Operation
			DoDragDrop(s, DragDropEffects.Copy | DragDropEffects.Move);
		}
		private void OnDragEnter(object sender, System.Windows.Forms.DragEventArgs e)
		{
			if (e.Data.GetDataPresent(DataFormats.Text))
				e.Effect = DragDropEffects.Copy;
			else
				e.Effect = DragDropEffects.None;
		}

		private void OnDragDrop(object sender, System.Windows.Forms.DragEventArgs e)
		{
			string typestring = "Type";
			string s = e.Data.GetData(typestring.GetType()).ToString();
			string orig_string = s;
			// Parse out the type information
			s = s.Substring(s.IndexOf(":")+1).Trim();
			s = s.Substring(1,s.Length-2);

			// First, add it to our list box
			this.listView2.Items.Add( s );

			// Find it in the first list box
			IEnumerator enumerator = listView1.Items.GetEnumerator();
			int whichIdx = -1;
			int idx = 0;
			while ( enumerator.MoveNext() )
			{
				string s2 = enumerator.Current.ToString();
				if ( s2.Equals(orig_string) )
				{
					whichIdx = idx;
					break;
				}
				idx ++;
			}
			this.listView1.Items.RemoveAt( whichIdx );

		}
	}
}