用C#实现在ListBox中拖动排序

 

using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace WindowsApplication2 ...{     public class Form1 : System.Windows.Forms.Form     ...{         private System.Windows.Forms.ListBox listBox1;         int indexofsource;//拖动的起始索引         int indexoftarget; //拖动的结束索引         private System.ComponentModel.Container components = null;         public Form1()         ...{              InitializeComponent();          }         protected override void Dispose(bool disposing)         ...{             if (disposing)             ...{                 if (components != null)                 ...{                      components.Dispose();                  }              }             base.Dispose(disposing);          }         Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码         private void InitializeComponent()         ...{             this.listBox1 = new System.Windows.Forms.ListBox();             this.SuspendLayout();             //             // listBox1             //             this.listBox1.AllowDrop = true;//这个属性一定要设置为true;             this.listBox1.ItemHeight = 12;             this.listBox1.Items.AddRange(new object[] ...{                 "1",                 "2",                 "3",                 "4",                 "5",                 "6",                 "7",                 "8",                 "9",                 "0"});             this.listBox1.Location = new System.Drawing.Point(16, 8);             this.listBox1.Name = "listBox1";             this.listBox1.ScrollAlwaysVisible = true;             this.listBox1.Size = new System.Drawing.Size(264, 136);             this.listBox1.TabIndex = 0;             this.listBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseDown);             this.listBox1.DragOver += new System.Windows.Forms.DragEventHandler(this.listBox1_DragOver);             this.listBox1.DragDrop += new System.Windows.Forms.DragEventHandler(this.listBox1_DragDrop);             this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);             this.ClientSize = new System.Drawing.Size(292, 273);             this.Controls.Add(this.listBox1);             this.Name = "Form1";             this.Text = "Form1";             this.ResumeLayout(false);          }         #endregion

 

 

 

 

 

 

 

[STAThread]         static void Main()         ...{              Application.Run(new Form1());          }         private void listBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)         ...{              indexofsource = ((ListBox)sender).IndexFromPoint(e.X, e.Y);             if (indexofsource != ListBox.NoMatches)             ...{                  ((ListBox)sender).DoDragDrop(((ListBox)sender).Items[indexofsource].ToString(), DragDropEffects.All);              }          }         private void listBox1_DragOver(object sender, System.Windows.Forms.DragEventArgs e)         ...{ //拖动源和放置的目的地一定是一个ListBox             if (e.Data.GetDataPresent(typeof(System.String)) && ((ListBox)sender).Equals(listBox1))             ...{                  e.Effect = DragDropEffects.Move;              }             else                  e.Effect = DragDropEffects.None;          }         private void listBox1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)         ...{              ListBox listbox = (ListBox)sender;              indexoftarget = listbox.IndexFromPoint(listbox.PointToClient(new Point(e.X, e.Y)));             if (indexoftarget != ListBox.NoMatches)             ...{                 string temp = listbox.Items[indexoftarget].ToString();                  listbox.Items[indexoftarget] = listbox.Items[indexofsource];                  listbox.Items[indexofsource] = temp;                  listbox.SelectedIndex = indexoftarget;              }          }      } }