Winform 窗口圆角实现

      项目需要，得把Winform的窗口做成圆角，同时把标题栏等一堆东西去掉，做成如下的样子：

 

      首先，在新建Winform之后，在属性栏中， 把MaximizeBox和MinimizeBox 置为False，同时将ShowIcon置为False，FormBorderStyle置为None。之后，窗口就变成一块白板了。

      然后，PS出一张如上的背景图来，把图做成圆角。将改图设为Winform的背景，BackgroundImageLayout设为Stretch。

      网上有人说此后只需要将Winform的BackColor置为Color.Transparent就Ok了， 但是VS2010会报错，控件背景不允许使用透明色。

      所以只能学习网上有人提到的办法，实现Winform的Paint时间，将窗口重绘成圆角的。

       

  1         private void Main_Paint(object sender, PaintEventArgs e)
  2         {
  3             List<Point> list = new List<Point>();
  4             int width = this.Width;
  5             int height = this.Height;
  6 
  7             #region 四个圆角
  8 
  9             //左上  
 10             list.Add(new Point(0, 47));
 11             list.Add(new Point(1, 42));
 12             list.Add(new Point(2, 38));
 13             list.Add(new Point(3, 36));
 14             list.Add(new Point(4, 33));
 15             list.Add(new Point(5, 32));
 16             list.Add(new Point(6, 29));
 17             list.Add(new Point(7, 27));
 18             list.Add(new Point(8, 26));
 19             list.Add(new Point(9, 24));
 20             list.Add(new Point(10, 22));
 21             list.Add(new Point(11, 21));
 22             list.Add(new Point(12, 20));
 23             list.Add(new Point(13, 19));
 24             list.Add(new Point(14, 17));
 25             list.Add(new Point(15, 16));
 26             list.Add(new Point(16, 15));
 27             list.Add(new Point(17, 14));
 28             list.Add(new Point(19, 13));
 29             list.Add(new Point(20, 12));
 30             list.Add(new Point(21, 11));
 31             list.Add(new Point(22, 10));
 32             list.Add(new Point(24, 9));
 33             list.Add(new Point(26, 8));
 34             list.Add(new Point(27, 7));
 35             list.Add(new Point(29, 6));
 36             list.Add(new Point(32, 5));
 37             list.Add(new Point(33, 4));
 38             list.Add(new Point(36, 3));
 39             list.Add(new Point(38, 2));
 40             list.Add(new Point(42, 1));
 41             list.Add(new Point(47, 0));
 42 
 43             //右上  
 44             list.Add(new Point(width - 47, 0));
 45             list.Add(new Point(width - 42, 1));
 46             list.Add(new Point(width - 38, 2));
 47             list.Add(new Point(width - 36, 3));
 48             list.Add(new Point(width - 33, 4));
 49             list.Add(new Point(width - 32, 5));
 50             list.Add(new Point(width - 29, 6));
 51             list.Add(new Point(width - 27, 7));
 52             list.Add(new Point(width - 26, 8));
 53             list.Add(new Point(width - 24, 9));
 54             list.Add(new Point(width - 22, 10));
 55             list.Add(new Point(width - 21, 11));
 56             list.Add(new Point(width - 20, 12));
 57             list.Add(new Point(width - 19, 13));
 58             list.Add(new Point(width - 17, 14));
 59             list.Add(new Point(width - 16, 15));
 60             list.Add(new Point(width - 15, 16));
 61             list.Add(new Point(width - 14, 17));
 62             list.Add(new Point(width - 13, 19));
 63             list.Add(new Point(width - 12, 20));
 64             list.Add(new Point(width - 11, 21));
 65             list.Add(new Point(width - 10, 22));
 66             list.Add(new Point(width - 9, 24));
 67             list.Add(new Point(width - 8, 26));
 68             list.Add(new Point(width - 7, 27));
 69             list.Add(new Point(width - 6, 29));
 70             list.Add(new Point(width - 5, 32));
 71             list.Add(new Point(width - 4, 33));
 72             list.Add(new Point(width - 3, 36));
 73             list.Add(new Point(width - 2, 38));
 74             list.Add(new Point(width - 1, 42));
 75             list.Add(new Point(width - 0, 47));
 76 
 77             //右下  
 78             list.Add(new Point(width - 0, height - 47));
 79             list.Add(new Point(width - 1, height - 42));
 80             list.Add(new Point(width - 2, height - 38));
 81             list.Add(new Point(width - 3, height - 36));
 82             list.Add(new Point(width - 4, height - 33));
 83             list.Add(new Point(width - 5, height - 32));
 84             list.Add(new Point(width - 6, height - 29));
 85             list.Add(new Point(width - 7, height - 27));
 86             list.Add(new Point(width - 8, height - 26));
 87             list.Add(new Point(width - 9, height - 24));
 88             list.Add(new Point(width - 10, height - 22));
 89             list.Add(new Point(width - 11, height - 21));
 90             list.Add(new Point(width - 12, height - 20));
 91             list.Add(new Point(width - 13, height - 19));
 92             list.Add(new Point(width - 14, height - 17));
 93             list.Add(new Point(width - 15, height - 16));
 94             list.Add(new Point(width - 16, height - 15));
 95             list.Add(new Point(width - 17, height - 14));
 96             list.Add(new Point(width - 19, height - 13));
 97             list.Add(new Point(width - 20, height - 12));
 98             list.Add(new Point(width - 21, height - 11));
 99             list.Add(new Point(width - 22, height - 10));
100             list.Add(new Point(width - 24, height - 9));
101             list.Add(new Point(width - 26, height - 8));
102             list.Add(new Point(width - 27, height - 7));
103             list.Add(new Point(width - 29, height - 6));
104             list.Add(new Point(width - 32, height - 5));
105             list.Add(new Point(width - 33, height - 4));
106             list.Add(new Point(width - 36, height - 3));
107             list.Add(new Point(width - 38, height - 2));
108             list.Add(new Point(width - 42, height - 1));
109             list.Add(new Point(width - 47, height - 0));
110 
111             //左下  
112             list.Add(new Point(47, height - 0));
113             list.Add(new Point(42, height - 1));
114             list.Add(new Point(38, height - 2));
115             list.Add(new Point(36, height - 3));
116             list.Add(new Point(33, height - 4));
117             list.Add(new Point(32, height - 5));
118             list.Add(new Point(29, height - 6));
119             list.Add(new Point(27, height - 7));
120             list.Add(new Point(26, height - 8));
121             list.Add(new Point(24, height - 9));
122             list.Add(new Point(22, height - 10));
123             list.Add(new Point(21, height - 11));
124             list.Add(new Point(20, height - 12));
125             list.Add(new Point(19, height - 13));
126             list.Add(new Point(17, height - 14));
127             list.Add(new Point(16, height - 15));
128             list.Add(new Point(15, height - 16));
129             list.Add(new Point(14, height - 17));
130             list.Add(new Point(13, height - 19));
131             list.Add(new Point(12, height - 20));
132             list.Add(new Point(11, height - 21));
133             list.Add(new Point(10, height - 22));
134             list.Add(new Point(9, height - 24));
135             list.Add(new Point(8, height - 26));
136             list.Add(new Point(7, height - 27));
137             list.Add(new Point(6, height - 29));
138             list.Add(new Point(5, height - 32));
139             list.Add(new Point(4, height - 33));
140             list.Add(new Point(3, height - 36));
141             list.Add(new Point(2, height - 38));
142             list.Add(new Point(1, height - 42));
143             list.Add(new Point(0, height - 47));
144 
145             #endregion
146 
147             Point[] points = list.ToArray();
148 
149             GraphicsPath shape = new GraphicsPath();
150             shape.AddPolygon(points);
151 
152             this.Region = new System.Drawing.Region(shape);
153 
154         }

       这样就把圆角窗口做出来了。需要说的是，这样设置出来的圆角是又毛刺的，精细程度跟你手动设置的点的个数有关，是个体力活。

       借鉴了别人的工作，致敬~