一、設計思路
  
  　　用c#寫的比較基礎的windows form 程序,該計算器實現了基礎的數學運算,如加,減,乘,除等任務.主要是通過該程序學習vs.net的
  
  　　編程環境,以及windows form程序.主要針對初學者
  
  　　我們分兩部份來實現程序,
  
  　　第一部份.程序界面
  
  　　1,以下控件表
  
  控件類型 name text
  form calcform 計算器
  button button1 0
   .....
   button10 9
   bdot .(小數點) 小數點按鈕
   bplus +(加號) 加號按鈕
   bsub -(減號) 減號按鈕
   bmul *(乘號) 乘號按鈕
   bdiv /(除號) 除號按鈕
   bequ =(等號) 等號按鈕
   bclr ac 清除按鈕
   textbox txtcalc (空值) 用來顯示輸入及輸出結果
  
  　　第二部份,程序結構
  
  　　1,定義以下變量
  
  double dblacc; //運算數a
  double dblsec; //運算數b
  bool blnclear,blnfrstopen;//布爾類型用來判斷清除與否,以及第一個顯示字符
  string stroper;//通過獲取stroper的值來決定運算+,-,*,/,=
  
  　　2,用以下方法來實現按鈕的動作
  
  　　例: bdot.click+=net eventhandler(btn_clk);//eventhandler類是事件代表類,用來注冊事件的處理方法.
  
  　　//第一個參數是object類型,指向發出事件的對象;
  
  　　//第二個參數是eventargs類型,包含了關于這個事件的數據
  
  　　3,用以下方法來判斷運算以及運算操作
  
  private void calc(){
  switch(stroper){
  　case "+":
  　　dblacc+=dblsec;//加法運算
  　　break;
  　case "-":
  　　dblacc-=dblsec;//減法運算
  　　break;
  　case "*":
  　　dblacc*=dblsec;//乘法運算
  　　break;
  　case "/":
  　　dblacc/=dblsec;//除法運算
  　　break;
  }
  stroper="=";//等號運算
  blnfrstopen=true;
  
  txtcalc.text=convert.tostring(dblacc);//將運算結果轉換成字符型,并輸出結果
  
  dblsec=dblacc;
  }
  
  　　4,小數點運算
  
  //先判斷是否已經按了小數點按鈕,如果按了,最0.x來代替運算變量,并且將轉換成double數型數值
  private void btn_clk(object obj,eventargs ea){
  　if(blnclear)
  　　txtcalc.text="";
  　　button b3=(button)obj;
  　　txtcalc.text+=b3.text;
  　if(txtcalc.text==".")
  　　txtcalc.text="0.";
  　　dblsec=convert.todouble(txtcalc.text);
  　　blnclear=false;
  }
  
  　　程序中所涉及到的一些問題,都給解決了,現在我們動手吧!操上我的利器,去完成任務吧!

  源程序
  
  //基本的計算器
  //蠶蛹 2001.11.26
  //using c#
  //e-mail:[email protected]
  using system;
  using system.drawing;
  using system.collections;
  using system.componentmodel;
  using system.windows.forms;
  
  namespace wincalc
  {
  ///
  /// summary description for calcform.
  ///
  public class calcform : system.windows.forms.form
  {
  private system.windows.forms.button button1;
  private system.windows.forms.button button2;
  private system.windows.forms.button button3;
  private system.windows.forms.button button4;
  private system.windows.forms.button button5;
  private system.windows.forms.button button6;
  private system.windows.forms.button button7;
  private system.windows.forms.button button8;
  private system.windows.forms.button button9;
  private system.windows.forms.button button10;
  private system.windows.forms.button bclr;
  private system.windows.forms.button bdot;
  private system.windows.forms.button bplus;
  private system.windows.forms.button bsub;
  private system.windows.forms.button bmul;
  private system.windows.forms.button bdiv;
  private system.windows.forms.button bequ;
  private system.windows.forms.textbox txtcalc;
  
  //以下是要添加的代碼
  //定義變量
  double dblacc;
  double dblsec;
  bool blnclear,blnfrstopen;
  string stroper;
  //以上是添加的代碼
  ///
  /// required designer variable.
  ///
  private system.componentmodel.container components = null;
  
  public calcform()
  {
  //
  // required for windows form designer support
  //
  initializecomponent();
  
  //
  // todo: add any constructor code after initializecomponent call
  //
  
  //以下是要添加的代碼
  //初始化設量
  dblacc=0;
  dblsec=0;
  blnfrstopen=true;
  blnclear=true;
  stroper=new string('=',1);
  //以上是添加的代碼
  }
  
  ///
  /// clean up any resources being used.
  ///
  protected override void dispose( bool disposing )
  {
  if( disposing )
  {
  if(components != null)
  {
  components.dispose();
  }
  }
  base.dispose( disposing );
  }
  
  #region windows form designer generated code
  ///
  /// required method for designer support - do not modify
  /// the contents of this method with the code editor.
  ///
  private void initializecomponent()
  {
  this.bplus = new system.windows.forms.button();
  this.bmul = new system.windows.forms.button();
  this.bdot = new system.windows.forms.button();
  this.txtcalc = new system.windows.forms.textbox();
  this.bclr = new system.windows.forms.button();
  this.bdiv = new system.windows.forms.button();
  this.bsub = new system.windows.forms.button();
  this.button8 = new system.windows.forms.button();
  this.button9 = new system.windows.forms.button();
  this.bequ = new system.windows.forms.button();
  this.button10 = new system.windows.forms.button();
  this.button4 = new system.windows.forms.button();
  this.button5 = new system.windows.forms.button();
  this.button6 = new system.windows.forms.button();
  this.button7 = new system.windows.forms.button();
  this.button1 = new system.windows.forms.button();
  this.button2 = new system.windows.forms.button();
  this.button3 = new system.windows.forms.button();
  this.suspendlayout();
  //
  // bplus
  //
  this.bplus.backcolor = system.drawing.systemcolors.control;
  this.bplus.forecolor = system.drawing.systemcolors.controltext;
  this.bplus.location = new system.drawing.point(208, 112);
  this.bplus.name = "bplus";
  this.bplus.size = new system.drawing.size(32, 80);
  this.bplus.tabindex = 1;
  this.bplus.text = "+";
  //以下是要添加的代碼
  bplus.click += new system.eventhandler(this.btn_oper);
  //以上是添加的代碼
  //
  // bmul
  //
  this.bmul.location = new system.drawing.point(160, 112);
  this.bmul.name = "bmul";
  this.bmul.size = new system.drawing.size(32, 32);
  this.bmul.tabindex = 1;
  this.bmul.text = "*";
  //以下是要添加的代碼
  bmul.click += new system.eventhandler(this.btn_oper);
  //以上是添加的代碼
  //
  // bdot
  //
  this.bdot.forecolor = system.drawing.color.black;
  this.bdot.location = new system.drawing.point(112, 208);
  this.bdot.name = "bdot";
  this.bdot.size = new system.drawing.size(32, 32);
  this.bdot.tabindex = 0;
  this.bdot.text = ".";
  //以下是要添加的代碼
  bdot.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // txtcalc
  //
  this.txtcalc.location = new system.drawing.point(16, 24);
  this.txtcalc.name = "txtcalc";
  this.txtcalc.readonly = true;
  this.txtcalc.righttoleft = system.windows.forms.righttoleft.yes;
  this.txtcalc.size = new system.drawing.size(224, 21);
  this.txtcalc.tabindex = 2;
  this.txtcalc.text = "";
  //
  // bclr
  //
  this.bclr.backcolor = system.drawing.systemcolors.control;
  this.bclr.forecolor = system.drawing.systemcolors.controltext;
  this.bclr.location = new system.drawing.point(208, 64);
  this.bclr.name = "bclr";
  this.bclr.size = new system.drawing.size(32, 32);
  this.bclr.tabindex = 0;
  this.bclr.text = "ac";
  //以下是要添加的代碼
  bclr.click += new system.eventhandler(this.btn_clr);
  //以上是添加的代碼
  //
  // bdiv
  //
  this.bdiv.location = new system.drawing.point(160, 160);
  this.bdiv.name = "bdiv";
  this.bdiv.size = new system.drawing.size(32, 32);
  this.bdiv.tabindex = 1;
  this.bdiv.text = "/";
  //以下是要添加的代碼
  bdiv.click += new system.eventhandler(this.btn_oper);
  //以上是添加的代碼
  //
  // bsub
  //
  this.bsub.location = new system.drawing.point(160, 64);
  this.bsub.name = "bsub";
  this.bsub.size = new system.drawing.size(32, 32);
  this.bsub.tabindex = 1;
  this.bsub.text = "-";
  //以下是要添加的代碼
  bsub.click += new system.eventhandler(this.btn_oper);
  //以上是添加的代碼
  //
  // button8
  //
  this.button8.location = new system.drawing.point(16, 64);
  this.button8.name = "button8";
  this.button8.size = new system.drawing.size(32, 32);
  this.button8.tabindex = 0;
  this.button8.text = "7";
  //以下是要添加的代碼
  button8.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button9
  //
  this.button9.location = new system.drawing.point(64, 64);
  this.button9.name = "button9";
  this.button9.size = new system.drawing.size(32, 32);
  this.button9.tabindex = 0;
  this.button9.text = "8";
  //以下是要添加的代碼
  button9.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // bequ
  //
  this.bequ.backcolor = system.drawing.systemcolors.control;
  this.bequ.forecolor = system.drawing.systemcolors.controltext;
  this.bequ.location = new system.drawing.point(160, 208);
  this.bequ.name = "bequ";
  this.bequ.size = new system.drawing.size(80, 32);
  this.bequ.tabindex = 1;
  this.bequ.text = "=";
  //以下是要添加的代碼
  bequ.click += new system.eventhandler(this.btn_equ);
  //以上是添加的代碼
  //
  // button10
  //
  this.button10.location = new system.drawing.point(112, 64);
  this.button10.name = "button10";
  this.button10.size = new system.drawing.size(32, 32);
  this.button10.tabindex = 0;
  this.button10.text = "9";
  //以下是要添加的代碼
  button10.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button4
  //
  this.button4.location = new system.drawing.point(112, 160);
  this.button4.name = "button4";
  this.button4.size = new system.drawing.size(32, 32);
  this.button4.tabindex = 0;
  this.button4.text = "3";
  //以下是要添加的代碼
  button4.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button5
  //
  this.button5.location = new system.drawing.point(16, 112);
  this.button5.name = "button5";
  this.button5.size = new system.drawing.size(32, 32);
  this.button5.tabindex = 0;
  this.button5.text = "4";
  //以下是要添加的代碼
  button5.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button6
  //
  this.button6.location = new system.drawing.point(64, 112);
  this.button6.name = "button6";
  this.button6.size = new system.drawing.size(32, 32);
  this.button6.tabindex = 0;
  this.button6.text = "5";
  //以下是要添加的代碼
  button6.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button7
  //
  this.button7.location = new system.drawing.point(112, 112);
  this.button7.name = "button7";
  this.button7.size = new system.drawing.size(32, 32);
  this.button7.tabindex = 0;
  this.button7.text = "6";
  //以下是要添加的代碼
  button7.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button1
  //
  this.button1.backcolor = system.drawing.systemcolors.control;
  this.button1.forecolor = system.drawing.color.black;
  this.button1.location = new system.drawing.point(16, 208);
  this.button1.name = "button1";
  this.button1.size = new system.drawing.size(80, 32);
  this.button1.tabindex = 0;
  this.button1.text = "0";
  //以下是要添加的代碼
  button1.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button2
  //
  this.button2.location = new system.drawing.point(16, 160);
  this.button2.name = "button2";
  this.button2.size = new system.drawing.size(32, 32);
  this.button2.tabindex = 0;
  this.button2.text = "1";
  //以下是要添加的代碼
  button2.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // button3
  //
  this.button3.location = new system.drawing.point(64, 160);
  this.button3.name = "button3";
  this.button3.size = new system.drawing.size(32, 32);
  this.button3.tabindex = 0;
  this.button3.text = "2";
  //以下是要添加的代碼
  button3.click += new system.eventhandler(this.btn_clk);
  //以上是添加的代碼
  //
  // calcform
  //
  this.autoscalebasesize = new system.drawing.size(6, 14);
  this.clientsize = new system.drawing.size(256, 261);
  this.controls.addrange(new system.windows.forms.control[] {
  this.txtcalc,
  this.bequ,
  this.bdiv,
  this.bmul,
  this.bsub,
  this.bplus,
  this.bdot,
  this.bclr,
  this.button10,
  this.button9,
  this.button8,
  this.button7,
  this.button6,
  this.button5,
  this.button4,
  this.button3,
  this.button2,
  this.button1});
  this.name = "calcform";
  this.text = "計算器";
  this.resumelayout(false);
  
  }
  #endregion
  
  //以下是要添加的代碼
  //小數點的操作
  private void btn_clk(object obj,eventargs ea){
  if(blnclear)
  txtcalc.text="";
  button b3=(button)obj;
  txtcalc.text+=b3.text;
  if(txtcalc.text==".")
  txtcalc.text="0.";
  dblsec=convert.todouble(txtcalc.text);
  blnclear=false;
  }
  
  //程序開始點
  private static void main(){
  application.run(new calcform());
  }
  
  private void btn_oper(object obj,eventargs ea){
  button tmp=(button)obj;
  stroper=tmp.text;
  if(blnfrstopen)
  dblacc=dblsec;
  else
  calc();
  blnfrstopen=false;
  blnclear=true;
  }
  
  //等號運算
  private void btn_equ(object obj,eventargs ea){
  calc();
  }
  
  //所有運算操作
  private void calc(){
  switch(stroper){
  case "+":
  dblacc+=dblsec; //加號運算
  break;
  case "-":
  dblacc-=dblsec; //減號運算
  break;
  case "*":
  dblacc*=dblsec; //乘號運算
  break;
  case "/":
  dblacc/=dblsec; //除號運算
  break;
  }
  stroper="="; //等號運算
  blnfrstopen=true;
  txtcalc.text=convert.tostring(dblacc);//將運算結果轉換成字符類型,并輸出
  dblsec=dblacc;//將運算數a的值放入運算數b中,以便后面運算
  }
  
  //清除按鈕
  private void btn_clr(object obj,eventargs ea){
  clear();
  }
  
  //清除按鈕的操作
  private void clear(){
  dblacc=0;
  dblsec=0;
  blnfrstopen=true;
  txtcalc.text="";
  txtcalc.focus();//設置焦點為txtcalc
  }
  //以上是添加的代碼
  }
  
  }
  
  　　以上只是一個簡單的用c#開發的windows form程序,在vs.nt bate2+windows 2000專業版編譯通過.向正在學習vs.net網友們拋磚引玉，其功能上還有很多不完善的地方，歡迎網友們將其完善。