zoukankan      html  css  js  c++  java
  • Drag and drop folder to a TextBox in C#

    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/

  • 相关阅读:
    查看真机的系统版本sdk
    查看真机的系统中sdk的版本
    用Appium去操作移动设备上的chrome
    adb devices 显示error
    创建一个web Test Plan
    Maven2的配置文件settings.xml(转)
    解决HierarchyViewer不能连接真机的问题
    利用Hudson持续集成来执行Android自动化测试(转)
    eclipse中修改maven仓储
    Appium的理念
  • 原文地址:https://www.cnblogs.com/open-coder/p/12661797.html
Copyright © 2011-2022 走看看