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The author:(作者)delv
published in(发表于) 2014/1/8 7:04:17
用C#.NET实现拖放操作_[Asp.Net教程]

用C#.NET实现拖放操作_[Asp.Net教程]

在应用程序中,是通过处理一系列事件,如DragEnter,DragLeave和DragDrop事件来实现在Windows应用程序中的拖放操作的。通过使用这些事件参数中的可用信息,可以轻松实现拖放操作。
拖放操作在代码中是通过三步实现的,首先是启动拖放操作,在需要拖动数据的控件上实现MouseDown事件响应代码,并调用DoDragDrop()方法;其次是实现拖放效果,在目标控件上添加DragEnter事件响应代码,使用DragDropEffects枚举类型实现移动或复制等拖动效果;最后是放置数据操作,在目标控件上添加DragDrop响应代码,把数据添加到目标控件中。
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;


namespace DragDrop
{
///


/// Form1 的摘要说明。
///

public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.ListBox listBox2;
///
/// 必需的设计器变量。
///

private System.ComponentModel.Container components = null;


public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();


//
// TOD 在 InitializeComponent 调用后添加任何构造函数代码
//
}


///


/// 清理所有正在使用的资源。
///

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}


#region Windows 窗体设计器生成的代码
///


/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///

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(32, 24);
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(120, 280);
this.listBox1.TabIndex = 0;
this.listBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseDown);
//
// listBox2
//
this.listBox2.ItemHeight = 12;
this.listBox2.Location = new System.Drawing.Point(248, 24);
this.listBox2.Name = "listBox2";
this.listBox2.Size = new System.Drawing.Size(120, 280);
this.listBox2.TabIndex = 0;
this.listBox2.DragDrop += new System.Windows.Forms.DragEventHandler(this.listBox2_DragDrop);
this.listBox2.DragEnter += new System.Windows.Forms.DragEventHandler(this.listBox2_DragEnter);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(408, 333);
this.Controls.Add(this.listBox1);
this.Controls.Add(this.listBox2);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);


}
#endregion


///


/// 应用程序的主入口点。
///

[STAThread]
static void Main()
{
Application.Run(new Form1());
}


private void Form1_Load(object sender, System.EventArgs e)
{
this.listBox1.AllowDrop = true;
this.listBox2.AllowDrop = true;
this.listBox1.Items.Add("a");
this.listBox1.Items.Add("b");
this.listBox1.Items.Add("c");
}


private void listBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
this.listBox1.DoDragDrop(this.listBox1.Items[this.listBox1.SelectedIndex],DragDropEffects.Move);
}


private void listBox2_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
{
if(e.Data.GetDataPresent("Text"))
{
e.Effect = DragDropEffects.Move;
}
}


private void listBox2_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
this.listBox2.Items.Add(e.Data.GetData("Text"));
this.listBox1.Items.Remove(e.Data.GetData("Text"));
}
}
}


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