在C#中实现窗口拖动功能的常用方法

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowDragDemo
{
    public partial class Form1 : Form
    {
        // 记录鼠标按下时的起始位置（相对于窗体客户区）
        private Point _mouseDownPoint = Point.Empty;

        public Form1()
        {
            InitializeComponent();
            // 可选：隐藏系统标题栏（演示无默认标题栏时的拖动功能）
            this.FormBorderStyle = FormBorderStyle.None;
            this.Size = new Size(800, 600);
            this.StartPosition = FormStartPosition.CenterScreen;
        }

        /// <summary>
        /// 鼠标按下时，记录起始坐标
        /// </summary>
        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e); // 保留窗体原有鼠标按下逻辑
            // 仅响应鼠标左键操作
            if (e.Button == MouseButtons.Left)
            {
                // 记录鼠标当前坐标（相对于窗体，而非屏幕）
                _mouseDownPoint = new Point(e.X, e.Y);
            }
        }

        /// <summary>
        /// 鼠标移动时，计算并更新窗体位置
        /// </summary>
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e); // 保留窗体原有鼠标移动逻辑
            // 条件：鼠标左键按住 + 起始坐标有效（已记录）
            if (e.Button == MouseButtons.Left && _mouseDownPoint != Point.Empty)
            {
                // 计算窗体新位置：屏幕坐标 = 当前窗体位置 + 鼠标移动偏移量
                this.Location = new Point(
                    this.Left + (e.X - _mouseDownPoint.X), // 水平方向偏移
                    this.Top + (e.Y - _mouseDownPoint.Y)   // 垂直方向偏移
                );
            }
        }

        /// <summary>
        /// 鼠标松开时，重置起始坐标，结束拖动
        /// </summary>
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e); // 保留窗体原有鼠标松开逻辑
            // 重置为空，避免后续无左键按下时仍触发拖动
            _mouseDownPoint = Point.Empty;
        }
    }
}

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowDragDemo
{
    public partial class Form1 : Form
    {
        // 记录鼠标按下时的起始位置
        private Point _mouseDownPoint = Point.Empty;

        public Form1()
        {
            InitializeComponent();
            // 初始化窗体和自定义标题栏
            InitControlSettings();
            // 绑定自定义标题栏的鼠标事件
            BindTitleBarEvents();
        }

        /// <summary>
        /// 初始化控件设置
        /// </summary>
        private void InitControlSettings()
        {
            this.FormBorderStyle = FormBorderStyle.None;
            this.Size = new Size(800, 600);
            this.StartPosition = FormStartPosition.CenterScreen;

            // 初始化自定义标题栏
            pnlTitleBar.Size = new Size(this.Width, 35);
            pnlTitleBar.Location = new Point(0, 0);
            pnlTitleBar.BackColor = Color.LightSkyBlue;
            pnlTitleBar.BorderStyle = BorderStyle.FixedSingle;
        }

        /// <summary>
        /// 绑定自定义标题栏的鼠标事件
        /// </summary>
        private void BindTitleBarEvents()
        {
            pnlTitleBar.MouseDown += PnlTitleBar_MouseDown;
            pnlTitleBar.MouseMove += PnlTitleBar_MouseMove;
            pnlTitleBar.MouseUp += PnlTitleBar_MouseUp;
        }

        /// <summary>
        /// 自定义标题栏鼠标按下事件
        /// </summary>
        private void PnlTitleBar_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                _mouseDownPoint = new Point(e.X, e.Y);
            }
        }

        /// <summary>
        /// 自定义标题栏鼠标移动事件
        /// </summary>
        private void PnlTitleBar_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left && _mouseDownPoint != Point.Empty)
            {
                this.Location = new Point(
                    this.Left + (e.X - _mouseDownPoint.X),
                    this.Top + (e.Y - _mouseDownPoint.Y)
                );
            }
        }

        /// <summary>
        /// 自定义标题栏鼠标松开事件
        /// </summary>
        private void PnlTitleBar_MouseUp(object sender, MouseEventArgs e)
        {
            _mouseDownPoint = Point.Empty;
        }
    }
}

using System.Windows;
using System.Windows.Input;

namespace WpfWindowDragDemo
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.WindowStyle = WindowStyle.None; // 隐藏系统标题栏
            this.Width = 800;
            this.Height = 600;
            this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
        }

        /// <summary>
        /// 自定义标题栏鼠标左键按下事件
        /// </summary>
        private void TitleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // 调用WPF内置方法，触发窗体拖动
            this.DragMove();
        }
    }
}