C#窗体控件拖动

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

namespace 窗体控件移动
{
public partial class Form1 : Form
{

private bool button_mousedown;//确认鼠标左键+alt是否按下
private Point original_point;//记录鼠标按下时原始位置
private Point control_original_point;//记录控件的原始位置
public Form1()
{
InitializeComponent();
}

//释放鼠标时
private void button1_MouseUp(object sender, MouseEventArgs e)
{
this.button_mousedown = false;//释放
}

//按下鼠标移动鼠标时
private void button1_MouseMove(object sender, MouseEventArgs e)//鼠标按下并移动时
{
if (button_mousedown == true)//确认鼠标左键+ctrl已按下时才发生
{
Point offset = new Point(Control.MousePosition.X - this.original_point.X, Control.MousePosition.Y - this.original_point.Y);//计算偏移量
this.custombutton.Location = new Point(this.control_original_point.X + offset.X, this.control_original_point.Y + offset.Y);//改变控件的位置
}
}

//按下鼠标左键时
private void button1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)//确认鼠标按下是不是左键
{
if (ModifierKeys == Keys.Control)//ctrl键是否按下
{
this.original_point = Control.MousePosition;//获取鼠标在屏幕上的位置
this.control_original_point = this.custombutton.Location;//控件初始位置
this.button_mousedown = true;//确认鼠标左键+ctrl已按下
}
}
}

//控件单击事件
private void button1_Click(object sender, EventArgs e)
{
if (this.button_mousedown == false)//没有拖拽时才引发click事件
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
System.Diagnostics.Process.Start("explorer.exe", ofd.FileName);
}
}
}

//加载窗口时注册相关事件
private void Form1_Load(object sender, EventArgs e)
{
this.custombutton.MouseDown+=button1_MouseDown;
this.custombutton.MouseMove+=button1_MouseMove;
this.custombutton.MouseUp+=button1_MouseUp;
}

}
}

用ctrl键+鼠标左击去进行拖动窗体控件；

值得注意的是一次mousedown+一次mouseup事件会引发一次click事件，这个要另外设置一个变量（就如上面的button_mousedown ）去记录，在没有拖动控件的意愿时才执行click事件

C#窗体控件拖动

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原文地址：http://www.cnblogs.com/magicianlyx/p/4824770.html