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 : UserControl13     {14         public FillBtn()15         {16             InitializeComponent();17         }18                /// <summary>19 /// 填充按钮20 /// </summary>21 /// <param name="btnNum">按钮数量</param>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         /// <summary>34 /// 布局按钮35 /// </summary>36 /// <returns></returns>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 }