C＃拖放复制控件 [英] C# Drag and Drop Copying Controls

问题描述

大家好！



我试图做一个简单的拖放操作，从一个面板到另一个面板......但我试图拖动的是一个按钮...



问题是我的代码移动控件而不是复制..我想维护源按钮...



这是我的代码：

Hello guys!

Im trying to do a simple drag and drop, from a panel to another panel...But what im trying to drag is a button...

The problem is that my code moves the control, not copy.. I want to maintain the source button...

here is my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DragDropExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void panel1_DragDrop(object sender, DragEventArgs e)
        {
            
            Control ctrl = e.Data.GetData(e.Data.GetFormats()[0]) as Control;
            if (ctrl != null)
            {
                ctrl.Location = this.panel1.PointToClient(new Point(e.X, e.Y));
                this.panel1.Controls.Add(ctrl);

            }

        }

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            //button1.DoDragDrop(button1, DragDropEffects.Copy | DragDropEffects.Move);
            button1.DoDragDrop(button1, DragDropEffects.Copy );
        }

        private void panel1_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Copy; 
        }

        private void Form1_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Copy ; 
        }


        private void Form1_DragDrop(object sender, DragEventArgs e)
        {
            Control ctrl = e.Data.GetData(e.Data.GetFormats()[0]) as Control;
            if (ctrl != null)
            {
                ctrl.Location = this.PointToClient(new Point(e.X, e.Y));
                this.Controls.Add(ctrl);
            }   
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }
}

感谢!!





Rafael

thanksss!!


Rafael

推荐答案

我从你对你的问题的描述中理解了什么，&我从你的代码中看到的是：

你想要复制控件，但是你得到的是控件移动了。

解决方案很简单：

替换每个语句，如：

Controls.Add（Ctrl）;

To：

Control Ctrl2 = nCtrl.Clone（）;

What I understand from your description of your problem, & what I see from your code is :
You want to copy the control, but what you got is, the control moved.
Solution is simple :
Replace every statement like :
Controls.Add(Ctrl);
To :
Control Ctrl2 = nCtrl.Clone();

Controls.Add(Ctrl2);

这篇关于C＃拖放复制控件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！