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The author:(作者)qq
published in(发表于) 2014/7/11 9:27:39
C#教程：拖放技术的典型应用实例

C#教程：拖放技术的典型应用实例|方法

拖放技术的典型应用

在应用程序中，用户有时希望将数据从一个控件中拖到另一个控件中，此时就需要用到拖放技术。图1和图2演示在两个文本框之间拖放数据。



图1 拖放前



图2 拖放后

程序开发步骤如下所示。

（1）新建一个窗体，在窗体中添加两个Label控件和两个TextBox控件，并将两个TextBox控件分别命名为txtDataTart和txtScoure。

（2）将txtDataTart文本框的AllowDrop属性设置为True。

（3）程序主要代码如下所示：

private void txtDataTart_DragDrop(object sender, DragEventArgs e)

{

txtDataTart.Text = e.Data.GetData(DataFormats.Text).ToString();

}

private void txtDataTart_DragEnter(object sender, DragEventArgs e)

{

e.Effect = DragDropEffects.Copy;

}

private void txtScoure_MouseMove(object sender, MouseEventArgs e)

{

if ((e.Button & MouseButtons.Left) == MouseButtons.Left)

{

string reportPath = Application.StartupPath.Substring(0, Application.StartupPath.Substring(0,

Application.StartupPath.LastIndexOf("")).LastIndexOf(""));

reportPath += @"sl3293dwarro.cur";

MyNoDropCursor = new Cursor(reportPath);

DragDropEffects dropEffect = this.txtScoure.DoDragDrop(this.txtScoure.Text, DragDropEffects.Copy | Drag DropEffects.Link);

}

}

完整程序代码如下：

★ ★★★★frmDoDragDrop.cs窗体代码文件完整程序代码★★★★★

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace _2_01

{

public partial class frmDoDragDrop : Form

{

public frmDoDragDrop()

{

InitializeComponent();

}

private Cursor MyNoDropCursor;

private void txtDataTart_DragDrop(object sender, DragEventArgs e)

{

txtDataTart.Text = e.Data.GetData(DataFormats.Text).ToString();

}

private void txtDataTart_DragEnter(object sender, DragEventArgs e)

{

e.Effect = DragDropEffects.Copy;

}

private void txtScoure_MouseMove(object sender, MouseEventArgs e)

{

if ((e.Button & MouseButtons.Left) == MouseButtons.Left)

{

string reportPath = Application.StartupPath.Substring(0, Application.StartupPath.Substring(0,

Application.StartupPath.LastIndexOf("")).LastIndexOf(""));

reportPath += @"3dwarro.cur";

MyNoDropCursor = new Cursor(reportPath);

DragDropEffects dropEffect = this.txtScoure.DoDragDrop(this.txtScoure.Text, DragDropEffects.Copy | DragDropEffects.Link);

}

}

private void txtDataTart_DragOver(object sender, DragEventArgs e)

{

this.Cursor = MyNoDropCursor;

}

private void frmDoDragDrop_Load(object sender, EventArgs e)

{

}

}

}

★ ★★★★frmDoDragDrop.designer.cs窗体设计文件完整程序代码★★★★★

namespace _2_01

{

partial class frmDoDragDrop

{

///

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