[C#Winform]界面美化Ⅰ窗体的圆角、移动和阴影+自定义最小化和关闭按钮

第一步

新建Windows窗体应用，所有（Name）均使用默认

第二步 

Form1 属性FormBorderStyle设置为None

然后打开两个事件

第三步

工具箱里拖两个按钮进来，属性改这些，两个按钮都是

第四步

给两个按钮加上表示最小化和最大化的图标，可以去这里找图标Free Icons & Symbols (flaticon.com)

然后两个按钮都打开Click事件

第五步

复制粘贴Form1的代码

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //圆角
        [DllImport("kernel32.dll")]
        public static extern int SetProcessWorkingSetSize(IntPtr process, int minSize, int maxSize);
        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
         (int nLeftRect, int nTopRect, int nRightRect, int nBottomRect, int nWidthEllipse, int nHeightEllipse);

        //阴影
        private const int CS_DropSHADOW = 0x20000;
        private const int GCL_STYLE = (-26);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int GetClassLong(IntPtr hwnd, int nIndex);

        //窗体移动
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;

        private void Form1_Load(object sender, EventArgs e)
        {
            //圆角
            Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 25, 25));
            //阴影
            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);
        }

        //窗体移动
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

        //最小化按钮
        private void button1_Click(object sender, EventArgs e)
        {
            WindowState = FormWindowState.Minimized;
        }
        //关闭按钮
        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}

演示