Csharp/C#教程：C#编写的windows计算器的实例代码分享

代码如下:
usingSystem;
usingSystem.Drawing;
usingSystem.Windows;
usingSystem.Windows.Forms;
usingSystem.Collections;
usingSystem.ComponentModel;
usingSystem.Data;
namespacecomput
{
   ///<summary>
   ///这是一个计算器的简单实现。
   ///</summary>
   publicclassForm1:System.Windows.Forms.Form
   {
       #region控件声明
       privateSystem.Windows.Forms.TextBoxtxtShow;
       privateSystem.Windows.Forms.GroupBoxgroupBox1;
       privateSystem.Windows.Forms.Buttonbtn_rev;
       privateSystem.Windows.Forms.Buttonbtn_dot;
       privateSystem.Windows.Forms.Buttonbtn_add;
       privateSystem.Windows.Forms.Buttonbtn_equ;
       privateSystem.Windows.Forms.Buttonbtn_sign;
       privateSystem.Windows.Forms.Buttonbtn_sub;
       privateSystem.Windows.Forms.Buttonbtn_mul;
       privateSystem.Windows.Forms.Buttonbtn_0;
       privateSystem.Windows.Forms.Buttonbtn_3;
       privateSystem.Windows.Forms.Buttonbtn_2;
       privateSystem.Windows.Forms.Buttonbtn_1;
       privateSystem.Windows.Forms.Buttonbtn_6;
       privateSystem.Windows.Forms.Buttonbtn_5;
       privateSystem.Windows.Forms.Buttonbtn_4;
       privateSystem.Windows.Forms.Buttonbtn_sqrt;
       privateSystem.Windows.Forms.Buttonbtn_div;
       privateSystem.Windows.Forms.Buttonbtn_7;
       privateSystem.Windows.Forms.Buttonbtn_8;
       privateSystem.Windows.Forms.Buttonbtn_9;
       privateSystem.Windows.Forms.MainMenumainMenu1;
       privateSystem.Windows.Forms.MenuItemmenuItem1;
       privateSystem.Windows.Forms.Buttonbtn_sqr;
       privateSystem.Windows.Forms.MenuItemmenuItem2;
       privateSystem.Windows.Forms.MenuItemmenuItem3;
       privateSystem.Windows.Forms.MenuItemmenuItem4;
       privateSystem.Windows.Forms.MenuItemmenuItem5;
       privateSystem.Windows.Forms.MenuItemmenuItem6;
       privateSystem.Windows.Forms.Buttonc;
       privateSystem.Windows.Forms.Buttonce;
       privateSystem.Windows.Forms.MenuItemmenuItem8;
       privateSystem.Windows.Forms.MenuItemmenuItem9;
       privateSystem.Windows.Forms.MenuItemmenuItem10;
       ///<summary>
       ///必需的设计器变量。
       ///</summary>
       privateSystem.ComponentModel.Containercomponents=null;
       publicForm1()
       {
           //
           //Windows窗体设计器支持所必需的
           //
           InitializeComponent();
           //
           //TODO:在InitializeComponent调用后添加任何构造函数代码
           //
       }
       ///<summary>
       ///清理所有正在使用的资源。
       ///</summary>
       protectedoverridevoidDispose(booldisposing)
       {
           if(disposing)
           {
               if(components!=null)
               {
                   components.Dispose();
               }
           }
           base.Dispose(disposing);
       }
      #endregion
       #region各控件的属性的方法WindowsFormDesignergeneratedcode
       ///<summary>
       ///设计器支持所需的方法-不要使用代码编辑器修改
       ///此方法的内容。
       ///</summary>
       privatevoidInitializeComponent()
       {
           System.Resources.ResourceManagerresources=newSystem.Resources.ResourceManager(typeof(Form1));
           this.txtShow=newSystem.Windows.Forms.TextBox();
           this.groupBox1=newSystem.Windows.Forms.GroupBox();
           this.c=newSystem.Windows.Forms.Button();
           this.ce=newSystem.Windows.Forms.Button();
           this.btn_rev=newSystem.Windows.Forms.Button();
           this.btn_dot=newSystem.Windows.Forms.Button();
           this.btn_add=newSystem.Windows.Forms.Button();
           this.btn_equ=newSystem.Windows.Forms.Button();
           this.btn_sign=newSystem.Windows.Forms.Button();
           this.btn_sub=newSystem.Windows.Forms.Button();
           this.btn_mul=newSystem.Windows.Forms.Button();
           this.btn_0=newSystem.Windows.Forms.Button();
           this.btn_3=newSystem.Windows.Forms.Button();
           this.btn_2=newSystem.Windows.Forms.Button();
           this.btn_1=newSystem.Windows.Forms.Button();
           this.btn_6=newSystem.Windows.Forms.Button();
           this.btn_5=newSystem.Windows.Forms.Button();
           this.btn_4=newSystem.Windows.Forms.Button();
           this.btn_sqrt=newSystem.Windows.Forms.Button();
           this.btn_div=newSystem.Windows.Forms.Button();
           this.btn_7=newSystem.Windows.Forms.Button();
           this.btn_8=newSystem.Windows.Forms.Button();
           this.btn_9=newSystem.Windows.Forms.Button();
           this.btn_sqr=newSystem.Windows.Forms.Button();
           this.mainMenu1=newSystem.Windows.Forms.MainMenu();
           this.menuItem1=newSystem.Windows.Forms.MenuItem();
           this.menuItem2=newSystem.Windows.Forms.MenuItem();
           this.menuItem3=newSystem.Windows.Forms.MenuItem();
           this.menuItem4=newSystem.Windows.Forms.MenuItem();
           this.menuItem5=newSystem.Windows.Forms.MenuItem();
           this.menuItem6=newSystem.Windows.Forms.MenuItem();
           this.menuItem8=newSystem.Windows.Forms.MenuItem();
           this.menuItem9=newSystem.Windows.Forms.MenuItem();
           this.menuItem10=newSystem.Windows.Forms.MenuItem();
           this.groupBox1.SuspendLayout();
           this.SuspendLayout();
           //
           //txtShow
           //
           this.txtShow.BackColor=System.Drawing.Color.FromArgb(((System.Byte)(192)),((System.Byte)(192)),((System.Byte)(255)));
           this.txtShow.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Regular,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.txtShow.ForeColor=System.Drawing.Color.Purple;
           this.txtShow.Location=newSystem.Drawing.Point(25,8);
           this.txtShow.Name=”txtShow”;
           this.txtShow.Size=newSystem.Drawing.Size(228,23);
           this.txtShow.TabIndex=1;
           this.txtShow.Text=”0.”;
           this.txtShow.TextAlign=System.Windows.Forms.HorizontalAlignment.Right;
           //
           //groupBox1
           //
           this.groupBox1.Controls.Add(this.c);
           this.groupBox1.Controls.Add(this.ce);
           this.groupBox1.Controls.Add(this.btn_rev);
           this.groupBox1.Controls.Add(this.btn_dot);
           this.groupBox1.Controls.Add(this.btn_add);
           this.groupBox1.Controls.Add(this.btn_equ);
           this.groupBox1.Controls.Add(this.btn_sign);
           this.groupBox1.Controls.Add(this.btn_sub);
           this.groupBox1.Controls.Add(this.btn_mul);
           this.groupBox1.Controls.Add(this.btn_0);
           this.groupBox1.Controls.Add(this.btn_3);
           this.groupBox1.Controls.Add(this.btn_2);
           this.groupBox1.Controls.Add(this.btn_1);
           this.groupBox1.Controls.Add(this.btn_6);
           this.groupBox1.Controls.Add(this.btn_5);
           this.groupBox1.Controls.Add(this.btn_4);
           this.groupBox1.Controls.Add(this.btn_sqrt);
           this.groupBox1.Controls.Add(this.btn_div);
           this.groupBox1.Controls.Add(this.btn_7);
           this.groupBox1.Controls.Add(this.btn_8);
           this.groupBox1.Controls.Add(this.btn_9);
           this.groupBox1.Controls.Add(this.btn_sqr);
           this.groupBox1.Location=newSystem.Drawing.Point(24,40);
           this.groupBox1.Name=”groupBox1″;
           this.groupBox1.Size=newSystem.Drawing.Size(232,184);
           this.groupBox1.TabIndex=21;
           this.groupBox1.TabStop=false;
           this.groupBox1.Text=”计算机区”;
           //
           //c
           //
           this.c.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.c.ForeColor=System.Drawing.Color.Red;
           this.c.Location=newSystem.Drawing.Point(178,48);
           this.c.Name=”c”;
           this.c.Size=newSystem.Drawing.Size(36,61);
           this.c.TabIndex=41;
           this.c.Text=”C”;
           this.c.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //ce
           //
           this.ce.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.ce.ForeColor=System.Drawing.Color.Red;
           this.ce.Location=newSystem.Drawing.Point(138,16);
           this.ce.Name=”ce”;
           this.ce.Size=newSystem.Drawing.Size(76,29);
           this.ce.TabIndex=40;
           this.ce.Text=”CE”;
           this.ce.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_rev
           //
           this.btn_rev.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_rev.ForeColor=System.Drawing.Color.Blue;
           this.btn_rev.Location=newSystem.Drawing.Point(178,112);
           this.btn_rev.Name=”btn_rev”;
           this.btn_rev.Size=newSystem.Drawing.Size(36,29);
           this.btn_rev.TabIndex=39;
           this.btn_rev.Text=”1/x”;
           this.btn_rev.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_dot
           //
           this.btn_dot.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_dot.Location=newSystem.Drawing.Point(98,144);
           this.btn_dot.Name=”btn_dot”;
           this.btn_dot.Size=newSystem.Drawing.Size(36,29);
           this.btn_dot.TabIndex=38;
           this.btn_dot.Tag=”0″;
           this.btn_dot.Text=”.”;
           this.btn_dot.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_add
           //
           this.btn_add.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_add.ForeColor=System.Drawing.Color.Red;
           this.btn_add.Location=newSystem.Drawing.Point(138,144);
           this.btn_add.Name=”btn_add”;
           this.btn_add.Size=newSystem.Drawing.Size(36,29);
           this.btn_add.TabIndex=37;
           this.btn_add.Text=”+”;
           this.btn_add.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_equ
           //
           this.btn_equ.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_equ.ForeColor=System.Drawing.Color.Red;
           this.btn_equ.Location=newSystem.Drawing.Point(178,144);
           this.btn_equ.Name=”btn_equ”;
           this.btn_equ.Size=newSystem.Drawing.Size(36,29);
           this.btn_equ.TabIndex=36;
           this.btn_equ.Text=”=”;
           this.btn_equ.Click+=newSystem.EventHandler(this.btn_equ_Click);
           //
           //btn_sign
           //
           this.btn_sign.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_sign.ForeColor=System.Drawing.Color.Blue;
           this.btn_sign.Location=newSystem.Drawing.Point(58,144);
           this.btn_sign.Name=”btn_sign”;
           this.btn_sign.Size=newSystem.Drawing.Size(36,29);
           this.btn_sign.TabIndex=35;
           this.btn_sign.Text=”+/-“;
           this.btn_sign.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_sub
           //
           this.btn_sub.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_sub.ForeColor=System.Drawing.Color.Red;
           this.btn_sub.Location=newSystem.Drawing.Point(138,112);
           this.btn_sub.Name=”btn_sub”;
           this.btn_sub.Size=newSystem.Drawing.Size(36,29);
           this.btn_sub.TabIndex=34;
           this.btn_sub.Text=”-“;
           this.btn_sub.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_mul
           //
           this.btn_mul.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_mul.ForeColor=System.Drawing.Color.Red;
           this.btn_mul.Location=newSystem.Drawing.Point(138,80);
           this.btn_mul.Name=”btn_mul”;
           this.btn_mul.Size=newSystem.Drawing.Size(36,29);
           this.btn_mul.TabIndex=33;
           this.btn_mul.Text=”*”;
           this.btn_mul.Click+=newSystem.EventHandler(this.btn_Oper);
           //
           //btn_0
           //
           this.btn_0.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_0.ForeColor=System.Drawing.Color.Blue;
           this.btn_0.Location=newSystem.Drawing.Point(18,144);
           this.btn_0.Name=”btn_0″;
           this.btn_0.Size=newSystem.Drawing.Size(36,29);
           this.btn_0.TabIndex=32;
           this.btn_0.Tag=”0″;
           this.btn_0.Text=”0″;
           this.btn_0.Click+=newSystem.EventHandler(this.btn_0_Click);
           //
           //btn_3
           //
           this.btn_3.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_3.ForeColor=System.Drawing.Color.Blue;
           this.btn_3.Location=newSystem.Drawing.Point(98,112);
           this.btn_3.Name=”btn_3″;
           this.btn_3.Size=newSystem.Drawing.Size(36,29);
           this.btn_3.TabIndex=31;
           this.btn_3.Tag=”3″;
           this.btn_3.Text=”3″;
           this.btn_3.Click+=newSystem.EventHandler(this.btn_0_Click);
           //
           //btn_2
           //
           this.btn_2.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_2.ForeColor=System.Drawing.Color.Blue;
           this.btn_2.Location=newSystem.Drawing.Point(58,112);
           this.btn_2.Name=”btn_2″;
           this.btn_2.Size=newSystem.Drawing.Size(36,29);
           this.btn_2.TabIndex=30;
           this.btn_2.Tag=”2″;
           this.btn_2.Text=”2″;
           this.btn_2.Click+=newSystem.EventHandler(this.btn_0_Click);
           //
           //btn_1
           //
           this.btn_1.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_1.ForeColor=System.Drawing.Color.Blue;
           this.btn_1.Location=newSystem.Drawing.Point(18,112);
           this.btn_1.Name=”btn_1″;
           this.btn_1.Size=newSystem.Drawing.Size(36,29);
           this.btn_1.TabIndex=29;
           this.btn_1.Tag=”1″;
           this.btn_1.Text=”1″;
           this.btn_1.Click+=newSystem.EventHandler(this.btn_0_Click);
           //
           //btn_6
           //
           this.btn_6.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_6.ForeColor=System.Drawing.Color.Blue;
           this.btn_6.Location=newSystem.Drawing.Point(98,80);
           this.btn_6.Name=”btn_6″;
           this.btn_6.Size=newSystem.Drawing.Size(36,29);
           this.btn_6.TabIndex=28;
           this.btn_6.Tag=”6″;
           this.btn_6.Text=”6″;
           this.btn_6.Click+=newSystem.EventHandler(this.btn_0_Click);
           //
           //btn_5
           //
           this.btn_5.Font=newSystem.Drawing.Font(“宋体”,10.5F,System.Drawing.FontStyle.Bold,System.Drawing.GraphicsUnit.Point,((System.Byte)(134)));
           this.btn_5.ForeColor=System.Drawing.Color.Blue;
           this.btn_5.Location=newSystem.Drawing.Poin

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