1 using System;  2 using System.Collections.Generic;  3 using System.ComponentModel;  4 using System.Drawing;  5 using System.Data;  6 using System.Linq;  7 using System.Text;  8 using System.Windows.Forms;  9 10 namespace 方格练习 11 {
   12     public partial class FillBtn : UserControl 13     {
   14         public FillBtn() 15         {
   16             InitializeComponent(); 17         } 18                /// 
 19 /// 填充按钮 20 /// 
 21 /// 按钮数量 22         public void FillButton(int btnNum) 23         {
   24             //填充btnNum*btnNum个方格,现在放置的是罗列着的 25             for (int i = 0; i < btnNum * btnNum; i++) 26             {
   27                 Button btn = new Button(); 28                 this.Controls.Add(btn); 29             } 30             //定义方法,因为需要改变大小,所以单独 31             this.LayoutBtns(); 32         } 33         /// 
 34 /// 布局按钮 35 /// 
 36 /// 
      37         private void LayoutBtns() 38         {
   39             //去除启动状态,以免开启的时候FillBtn_SizeChanged会报错 40             if (this.Controls.Count==0) 41             {
   42                 return; 43             } 44             //循环多少次?计算出来 45             int btnLineNum = (int)Math.Sqrt(this.Controls.Count); 46             //计算按钮的宽度 47             int btnWidth = this.Width / btnLineNum; 48             int btnHeight = this.Height / btnLineNum; 49 50             int btnIndex = 0; 51             int btnX = 0, btnY = 0; 52             //竖向的循环嵌套横着的循环 53             for (int verticalIndex = 0; verticalIndex < btnLineNum; verticalIndex++) 54             {
   55                 btnY = verticalIndex * btnHeight; 56                 //水平向的循环 57                 for (int horizontalIndex = 0; horizontalIndex < btnLineNum; horizontalIndex++) 58                 {
   59                     btnX = horizontalIndex * btnWidth; 60                     //获取要放置的方格 61                     Button btn = this.Controls[btnIndex] as Button; 62                     //设置当前方格的大小 63                     btn.Size = new Size(btnWidth, btnHeight); 64                     //设置当前方格的位置 65                     btn.Location = new Point(btnX, btnY); 66                     //下一个方格 67                     btnIndex++; 68                 } 69             } 70         } 71 72         private void FillBtn_SizeChanged(object sender, EventArgs e) 73         {
   74             //设置当控件大小改变时的事件 75             this.LayoutBtns(); 76         } 77     } 78 }