ListBox的Item拖放

[Bullatus]

ListBox中已有数个Item
我想要实现的是，能用鼠标拖拽某个Item来调整其在List中的位置，拖拽过程中应能显示当放开鼠标时会插入在哪里。
这个怎么实现？

[dbcxbj]

vb.net里的ListBox不具备你说的功能，你可以用一个ListBox加一个文本框来实现这个功能，选中的ListBox的Item
然后在文本框内输入要放入的位置(索引)，不过可能会麻烦点。

[Bullatus]

不知道有没有什么第三方控件可以实现这个功能呢？

[Bullatus]

顶一下

[51Crack]

给你个C#的两个ListBox间拖拽的例子，一个的自己研究(只不过是插入后删除原来的)!

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

namespace WindowsApplication596
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <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()
		{
			this.listBox1 = new System.Windows.Forms.ListBox();
			this.listBox2 = new System.Windows.Forms.ListBox();
			this.SuspendLayout();
			// 
			// listBox1
			// 
			this.listBox1.ItemHeight = 12;
			this.listBox1.Location = new System.Drawing.Point(48, 32);
			this.listBox1.Name = "listBox1";
			this.listBox1.Size = new System.Drawing.Size(192, 328);
			this.listBox1.TabIndex = 1;
			this.listBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseDown);
			this.listBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseMove);
			// 
			// listBox2
			// 
			this.listBox2.AllowDrop = true;
			this.listBox2.ItemHeight = 12;
			this.listBox2.Location = new System.Drawing.Point(288, 32);
			this.listBox2.Name = "listBox2";
			this.listBox2.Size = new System.Drawing.Size(192, 328);
			this.listBox2.TabIndex = 2;
			this.listBox2.DragOver += new System.Windows.Forms.DragEventHandler(this.listBox2_DragOver);
			this.listBox2.DragDrop += new System.Windows.Forms.DragEventHandler(this.listBox2_DragDrop);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(536, 405);
			this.Controls.Add(this.listBox2);
			this.Controls.Add(this.listBox1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

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

		private void Form1_Load(object sender, System.EventArgs e) {
			for (int i = 0; i < 10; i++) {
				if (i % 2 == 0)
					listBox1.Items.Add("Item " + i.ToString());
				else
					listBox2.Items.Add("Item " + i.ToString());				
			}
		}

		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.ListBox listBox2;

		Point p = Point.Empty;

		private void listBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) 
		{
			ListBox c = sender as ListBox;
			p = new Point(e.X, e.Y);
			int selectedIndex = c.IndexFromPoint(p);
			if (selectedIndex == -1)
				p = Point.Empty;
		}

		private void listBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) 
		{
			if (e.Button == MouseButtons.Left)
				if ((p != Point.Empty) && ((Math.Abs(e.X - p.X) > 5) || (Math.Abs(e.Y - p.Y) > 5)))
					listBox1.DoDragDrop(sender, DragDropEffects.Move);
		}

		private void listBox2_DragOver(object sender, System.Windows.Forms.DragEventArgs e) 
		{
			e.Effect = DragDropEffects.Move;
		}

		private void listBox2_DragDrop(object sender, System.Windows.Forms.DragEventArgs e) 
		{            
			ListBox listBox = sender as ListBox;
			Point newPoint = new Point(e.X, e.Y);
			newPoint = listBox.PointToClient(newPoint);
			int selectedIndex = listBox.IndexFromPoint(newPoint);
			object item = listBox1.Items[listBox1.IndexFromPoint(p)];
			if (selectedIndex == -1)
				listBox.Items.Add(item);
			else
				listBox.Items.Insert(selectedIndex, item);
		}

	}
}

[Bullatus]

不是插入后删除那么简单啊，需要现在放开后应在的位置，这个没有解决。

[Bullatus]

51Crack，你的代码还是有些帮助的，分就给你吧。