Drag and drop folder to a TextBox in C#

2021-03-11 02:31

阅读：519

标签：display code send director spl HERE cccccc last ret

Last evening I came up with a requirement to drag a folder path into a TextBox in one of my Windows form applications. So I just want to share it with you all through a simple example.

Drag-and-drop operations in WinForms accomplish via handling of a series of events, mostly with the DragDrop, DragEnter and DragLeave. Working with the event arguments of these events eventually you can facilitate drag and drop.

How to perform a drag & drop

Set the property called AllowDrop to true on the selected control. (a TextBox in this case)

The DragEnter event for the control where the drop will occur, do the type-checking here to ensure that the data being dragged is of an acceptable type. In this case it is FileDrop, which specifies the Windows file drop format.

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

The DragDrop event for the control where the drop will occur, retrieve the data being dragged using the GetData.

private void txtFolderPath_DragDrop(object sender, DragEventArgs e)
{
     if (e.Data.GetDataPresent(DataFormats.FileDrop))
     {
          string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
 
          if (Directory.Exists(files[0]))
          {
               this.txtFolderPath.Text = files[0];
          }
     }
}

In the complete code below, a TextBox control is the control being the drop will occur. Once you drag a folder into the TextBox and drop, the relevant folder path is added into the TextBox text property and display.

public partial class Form1 : Form
{
     private System.Windows.Forms.TextBox txtFolderPath = new TextBox();
 
     public Form1()
     {
          InitializeComponent();
 
          this.txtFolderPath.Location = new System.Drawing.Point(20, 30);
          this.txtFolderPath.Size = new System.Drawing.Size(200, 20);
          this.Controls.Add(this.txtFolderPath);
 
          this.txtFolderPath.AllowDrop = true;
          this.txtFolderPath.DragEnter += new DragEventHandler(txtFolderPath_DragEnter);
          this.txtFolderPath.DragDrop += new DragEventHandler(txtFolderPath_DragDrop);
     }
 
     private void txtFolderPath_DragDrop(object sender, DragEventArgs e)
     {
          if (e.Data.GetDataPresent(DataFormats.FileDrop))
          {
               string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
 
               if (Directory.Exists(files[0]))
               {
                    this.txtFolderPath.Text = files[0];
               }
          }
     }
 
     private void txtFolderPath_DragEnter(object sender, DragEventArgs e)
     {
          if (e.Data.GetDataPresent(DataFormats.FileDrop))
          {
               e.Effect = DragDropEffects.Copy;
          }
          else
          {
               e.Effect = DragDropEffects.None;
          }
     }
}

Ref: https://erangatennakoon.wordpress.com/2012/04/10/drag-and-drop-folder-to-a-textbox-in-c/

Drag and drop folder to a TextBox in C#

标签：display code send director spl HERE cccccc last ret

原文地址：https://www.cnblogs.com/open-coder/p/12661797.html

上一篇：神奇 linux 命令行窗体穿越

下一篇：Windows 挂起进程

文章来自：搜素材网的编程语言模块，转载请注明文章出处。
文章标题：Drag and drop folder to a TextBox in C#
文章链接：http://soscw.com/index.php/essay/63004.html

亲，登录后才可以留言！

Drag and drop folder to a TextBox in C#

评论

热门文章

推荐文章

最新文章

置顶文章