问什么我的textbox不能dragdrop，而dragover和dragenter都可以,allowdrop=true已经打开了 （没分了）

[2004831]

问什么我的textbox不能dragdrop，而dragover和dragenter都可以,allowdrop=true已经打开了

private void textBox1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
MessageBox.Show("a");

}
label也一样不行

private void label1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
MessageBox.Show("a");
}

可是DragOver和DragEnter就可以，怎么回事啊。有没有高手帮帮我啊。

[hujiiori]

DoDragDrop这个方法执行了没有？

[xiaoslong]

帮你顶

[2004831]

我是从资源管理器中拖一个文件过来

[cnhgj]

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

namespace TreeDnD
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
/// <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.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(72, 152);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(280, 21);
this.textBox1.TabIndex = 2;
this.textBox1.Text = "textBox1";
//
// Form1
//
this.AllowDrop = true;
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(496, 341);
this.Controls.Add(this.textBox1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.DragDrop += new System.Windows.Forms.DragEventHandler(this.Form1_DragDrop);
this.DragEnter += new System.Windows.Forms.DragEventHandler(this.Form1_DragEnter);
this.ResumeLayout(false);

}
#endregion

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

private void Form1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}

private void Form1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
System.Array myarr =(System.Array) e.Data.GetData(DataFormats.FileDrop);
System.Collections.IEnumerator myEnumerator = myarr.GetEnumerator();
myEnumerator.MoveNext() ;
textBox1.Text=myEnumerator.Current.ToString() ;

}

private void Form1_Load(object sender, System.EventArgs e)
{

}


}
}

[cnhgj]

以上示例是拖动一个文件后，在TEXTBOX中显示该文件的路径的例子。。

把FORM1的AllowDrop设为true

private void Form1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}

private void Form1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
System.Array myarr =(System.Array) e.Data.GetData(DataFormats.FileDrop);
System.Collections.IEnumerator myEnumerator = myarr.GetEnumerator();
myEnumerator.MoveNext() ;
textBox1.Text=myEnumerator.Current.ToString() ;

}

[2004831]

我试了，没有用你的代码，我自己弄了一个Form1_DragEnter
把FORM1的AllowDrop设为true,可是就是不行，鼠标的形状也没有变化，
是怎么会是啊

[cnhgj]

你要写事件，鼠标才会变的

private void Form1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}