c#异形窗体遮罩效果

 c#异形窗体遮罩效果，移动，关闭，最大化，最小化，还原操作

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace WindowsFormsApp1
{public partial class Form1 : Form{private Point mouseOffset;                 //记录鼠标指针的坐标 private bool isMouseDown = false;      //记录鼠标按键是否按下public Form1(){this.StartPosition = FormStartPosition.CenterScreen;InitializeComponent();}private void Form1_Load(object sender, EventArgs e){TransparencyKey = Color.White;Image BackgroundImage = Bitmap.FromFile("111.png");BitmapRegion BitmapRegion = new BitmapRegion();//此为生成不规则窗体和控件的类//  BitmapRegion.CreateControlRegion(this, new Bitmap("feichuan5.jpg"));BitmapRegion.CreateControlRegion(this, new Bitmap("feichuan5a.png"));}private void button_start_Click(object sender, EventArgs e){MessageBox.Show("程序以启动");}private void button_close_Click(object sender, EventArgs e){MessageBox.Show("程序已将关闭");this.Close();}private void button_max_Click(object sender, EventArgs e){this.WindowState = FormWindowState.Maximized;}private void button_min_Click(object sender, EventArgs e){this.WindowState = FormWindowState.Minimized;}private void button_to_default_Click(object sender, EventArgs e){this.WindowState = FormWindowState.Normal;}private void Form1_MouseDown(object sender, MouseEventArgs e){int xOffset;int yOffset;if (e.Button == MouseButtons.Left){xOffset = -e.X - SystemInformation.FrameBorderSize.Width;yOffset = -e.Y - SystemInformation.CaptionHeight -SystemInformation.FrameBorderSize.Height;mouseOffset = new Point(xOffset, yOffset);isMouseDown = true;}}private void Form1_MouseMove(object sender, MouseEventArgs e){if (isMouseDown){Point mousePos = Control.MousePosition;mousePos.Offset(mouseOffset.X, mouseOffset.Y);Location = mousePos;}}private void Form1_MouseUp(object sender, MouseEventArgs e){//   修改鼠标状态isMouseDown的值//   确保只有鼠标左键按下并移动时，才移动窗体if (e.Button == MouseButtons.Left){isMouseDown = false;}}}
}

工程代码：

https://download.csdn.net/download/txwtech/88746025https://download.csdn.net/download/txwtech/88746025