自定义窗体和控件

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;
using MyFormDLL;
namespace WindowsFormsApplication2
{
    public partial class Form1 : FrmBaseWindow
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void panelTitle_Paint(object sender, PaintEventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            CanResize = true;
            MyWindowTitle = "999988888";
        }
    }
}

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 MyFormDLL
{
    public partial class FrmBaseWindow : Form
    {
      
        private string _myWindowTitle;
        [DefaultValue(typeof(string), "TTC 称重管理平台")]
        public string MyWindowTitle
        {
            get
            {
                return _myWindowTitle;
            }
            set
            {
                _myWindowTitle = value;
                lblTitle.Text = _myWindowTitle;
            }
        }
        

        //是否允许窗体改变大小     
        public bool CanResize{get;set;}
       




        public FrmBaseWindow()
        {
            InitializeComponent();
        }

        private void FrmBaseWindow_Load(object sender, EventArgs e)
        {
       
           
        }

        private void btnMaxSize_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.WindowState = FormWindowState.Maximized;
            }           
        }
       

        private void btnMinSize_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                //case Win32.WM_ERASEBKGND:
                //    m.Result = IntPtr.Zero;
                //    break;
                case Win32.WM_NCHITTEST:
                    WmNcHitTest(ref m);
                    break;
                default:
                    base.WndProc(ref m);
                    break;
            }

        }


        //调整窗体大小
        private void WmNcHitTest(ref Message m)
        {
            int wparam = m.LParam.ToInt32();
            Point mouseLocation = new Point(LOWORD(wparam), HIWORD(wparam));
            mouseLocation = PointToClient(mouseLocation);

            if (WindowState != FormWindowState.Maximized)
            {
                if (CanResize == true)
                {
                    if (mouseLocation.X < 5 && mouseLocation.Y < 5)
                    {
                        m.Result = new IntPtr(Win32.HTTOPLEFT);
                        return;
                    }

                    if (mouseLocation.X > Width - 5 && mouseLocation.Y < 5)
                    {
                        m.Result = new IntPtr(Win32.HTTOPRIGHT);
                        return;
                    }

                    if (mouseLocation.X < 5 && mouseLocation.Y > Height - 5)
                    {
                        m.Result = new IntPtr(Win32.HTBOTTOMLEFT);
                        return;
                    }

                    if (mouseLocation.X > Width - 5 && mouseLocation.Y > Height - 5)
                    {
                        m.Result = new IntPtr(Win32.HTBOTTOMRIGHT);
                        return;
                    }

                    if (mouseLocation.Y < 3)
                    {
                        m.Result = new IntPtr(Win32.HTTOP);
                        return;
                    }

                    if (mouseLocation.Y > Height - 3)
                    {
                        m.Result = new IntPtr(Win32.HTBOTTOM);
                        return;
                    }

                    if (mouseLocation.X < 3)
                    {
                        m.Result = new IntPtr(Win32.HTLEFT);
                        return;
                    }

                    if (mouseLocation.X > Width - 3)
                    {
                        m.Result = new IntPtr(Win32.HTRIGHT);
                        return;
                    }
                }
            }
            m.Result = new IntPtr(Win32.HTCAPTION);

            //标题栏随最大化移动
            //panelTitle.Width = mouseLocation.X - 2;
        }

        /// <summary>
        /// 取低位 X 坐标
        /// </summary>
        public static int LOWORD(int value)
        {
            return value & 0xFFFF;
        }

        /// <summary>
        /// 取高位 Y 坐标
        /// </summary>
        public static int HIWORD(int value)
        {
            return value >> 16;
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
            if (e.Button == MouseButtons.Left)
            {
                Win32.ReleaseCapture();
                Win32.SendMessage(this.Handle, Win32.WM_NCLBUTTONDOWN, Win32.HTCAPTION, 0);

            }
        }

        private void panelTitle_MouseDown(object sender, MouseEventArgs e)
        {
            base.OnMouseDown(e);
            if (e.Button == MouseButtons.Left)
            {
                Win32.ReleaseCapture();
                Win32.SendMessage(this.Handle, Win32.WM_NCLBUTTONDOWN, Win32.HTCAPTION, 0);

            }

        }
      
        private void FrmWindow_SizeChanged(object sender, EventArgs e)
        {
           // this.lblTitle.Location = new System.Drawing.Point(50, 2);

            //标题栏随最大化移动
            panelTitle.Width = this.Width;
            //移动控制按钮
            this.btnMinSize.Location = new System.Drawing.Point(this.Width - 140, 2);
            this.btnMaxSize.Location = new System.Drawing.Point(this.Width - 90, 2);
            this.btnClose.Location = new System.Drawing.Point(this.Width - 50, 2);
        }

   




    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace MyFormDLL
{
    public class Win32
    {
        #region Window Const

        public const int WM_ERASEBKGND = 0x0014;
        public const int WM_LBUTTONDOWN = 0x0201;
        public const int WM_LBUTTONUP = 0x0202;
        public const int WM_LBUTTONDBLCLK = 0x0203;
        public const int WM_WINDOWPOSCHANGING = 0x46;
        public const int WM_PAINT = 0xF;
        public const int WM_CREATE = 0x0001;
        public const int WM_ACTIVATE = 0x0006;
        public const int WM_NCCREATE = 0x0081;
        public const int WM_NCCALCSIZE = 0x0083;
        public const int WM_NCPAINT = 0x0085;
        public const int WM_NCACTIVATE = 0x0086;
        public const int WM_NCLBUTTONDOWN = 0x00A1;
        public const int WM_NCLBUTTONUP = 0x00A2;
        public const int WM_NCLBUTTONDBLCLK = 0x00A3;
        public const int WM_NCMOUSEMOVE = 0x00A0;

        public const int WM_NCHITTEST = 0x0084;

        public const int HTLEFT = 10;
        public const int HTRIGHT = 11;
        public const int HTTOP = 12;
        public const int HTTOPLEFT = 13;
        public const int HTTOPRIGHT = 14;
        public const int HTBOTTOM = 15;
        public const int HTBOTTOMLEFT = 0x10;
        public const int HTBOTTOMRIGHT = 17;
        public const int HTCAPTION = 2;
        public const int HTCLIENT = 1;

        public const int WM_FALSE = 0;
        public const int WM_TRUE = 1;



        #endregion

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();


    }
}