GDI繪製網格

//網格寬300，高600

bitmap image = new bitmap(300,600);
//建立繪圖物件graphics
graphics graphics = graphics.fromimage (image);
//清除畫布，背景顏色為紅色
graphics.clear(color.red);
//通過迴圈畫出橫線
for (int i = 0; i < 30; i++)
//通過迴圈畫出豎線
for (int i = 0; i < 20; i++)
this.backgroundimage = image;
//加邊框
graphics.drawrectangle(new pen(color.black), 0, 0, image.width - 1, image.height - 1);
//設定平鋪方式
				
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