两个Form窗体之间的拖动事件

代码是两个窗体Form1,Form2，可以建立一个应用程序把代码放到项目里启动Form1来运行程序,环境是VS2005。


代码Form1.cs

C# code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace dragControl
{
public partial class Form1 : Form
{
private System.Windows.Forms.Button button1;
public Form1()
{
InitializeComponent();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.button1 = new System.Windows.Forms.Button();
//
// button1
// 
            this.button1.Location = new System.Drawing.Point(116, 65);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);
this.Controls.Add(this.button1);
}
private void button1_MouseDown(object sender, MouseEventArgs e)
{
this.button1.DoDragDrop(sender, DragDropEffects.Move);
}
protected override void OnDoubleClick(EventArgs e)
{
base.OnDoubleClick(e);
Form2 frm = new Form2();
frm.Show();
}
}
}

代码Form2.cs

C# code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace dragControl
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.AllowDrop = true;
this.DragDrop += new System.Windows.Forms.DragEventHandler(this.Form2_DragDrop);
this.DragOver += new System.Windows.Forms.DragEventHandler(this.Form2_DragOver);
}
private void Form2_DragOver(object sender, DragEventArgs e)
{
if (e.AllowedEffect == DragDropEffects.Move)
{
e.Effect = DragDropEffects.Move;
}
}
private void Form2_DragDrop(object sender, DragEventArgs e)
{
Button btn = e.Data.GetData("System.Windows.Forms.Button") as Button;
if (btn != null)
{
if (btn.Parent != null)
{
btn.Parent.Controls.Remove(btn);
btn.Location = this.PointToClient(new Point(e.X, e.Y));
this.Controls.Add(btn);
}
}
}
}
}