源文件内容：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace wzy2
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;

  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.Button button3;

  private System.Windows.Forms.RichTextBox richTextBox1;
  private System.Windows.Forms.RichTextBox richTextBox2;

  private System.Windows.Forms.OpenFileDialog openFileDialog1;
  private System.Windows.Forms.SaveFileDialog saveFileDialog1;
 
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // 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>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方式 - 不要使用代码编辑器修改
  /// 此方式的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.label1 = new System.Windows.Forms.Label();
   this.button1 = new System.Windows.Forms.Button();
   this.richTextBox1 = new System.Windows.Forms.RichTextBox();
   this.button2 = new System.Windows.Forms.Button();
   this.richTextBox2 = new System.Windows.Forms.RichTextBox();
   this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
   this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
   this.button3 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(8, 8);
   this.label1.Name = \"label1\";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 0;
   this.label1.Text = \"词法分析\";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(240, 8);
   this.button1.Name = \"button1\";
   this.button1.Size = new System.Drawing.Size(64, 23);
   this.button1.TabIndex = 1;
   this.button1.Text = \"分析\";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // richTextBox1
   //
   this.richTextBox1.Location = new System.Drawing.Point(24, 48);
   this.richTextBox1.Name = \"richTextBox1\";
   this.richTextBox1.Size = new System.Drawing.Size(240, 352);
   this.richTextBox1.TabIndex = 2;
   this.richTextBox1.Text = \"\";
  // this.richTextBox1.TextChanged += new System.EventHandler(this.richTextBox1_TextChanged);
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(96, 8);
   this.button2.Name = \"button2\";
   this.button2.Size = new System.Drawing.Size(64, 23);
   this.button2.TabIndex = 3;
   this.button2.Text = \"读入\";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // richTextBox2
   //
   this.richTextBox2.Location = new System.Drawing.Point(280, 48);
   this.richTextBox2.Name = \"richTextBox2\";
   this.richTextBox2.Size = new System.Drawing.Size(280, 352);
   this.richTextBox2.TabIndex = 4;
   this.richTextBox2.Text = \"\";
   //
   // button3
   //
   this.button3.Location = new System.Drawing.Point(384, 8);
   this.button3.Name = \"button3\";
   this.button3.Size = new System.Drawing.Size(56, 23);
   this.button3.TabIndex = 5;
   this.button3.Text = \"保存\";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(584, 430);
   this.Controls.Add(this.button3);
   this.Controls.Add(this.richTextBox2);
   this.Controls.Add(this.button2);
   this.Controls.Add(this.richTextBox1);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.label1);
   this.MaximizeBox = false;
   this.Name = \"Form1\";
   this.Text = \"Form1\";
  // this.Load += new System.EventHandler(this.Form1_Load);
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
/// <summary>
/// 词法分析函数
/// </summary>
/// <param name=\"sender\"></param>
/// <param name=\"e\"></param>
  private void button1_Click(object sender, System.EventArgs e)
  {
   //得到想要的字符数组。
   char[] getch = textToCharArray();

   //将字符数组，转变为词法分析后的　单词数组。
   string[] stringArray = charArrayToStringArray(getch);

   //将单词数组分类，用数字标出各个单词所在的类别。
   string[,] twoStringArray = stringArrayToTwoStringArray(stringArray);

   //用于输出二维数组。
   printString(twoStringArray);

  }
/// <summary>
/// 输出结果　即用于输出二维数组。
/// </summary>
/// <param name=\"twoStringArray\"></param>
  private void printString(string[,] twoStringArray)
  {
   //提示说明
   this.richTextBox2.Text =\"1 -> 保留字\"  + \"/r/n\" +
         \"2 -> 运算符\"  + \"/r/n\" +
         \"3 -> 分隔符\"  + \"/r/n\" +
         \"4 -> 数字 \"   + \"/r/n\" +
         \"5 -> 其它\"    + \"/r/n\";
   //输出二维数组中的数据
   for(int x=0;x<twoStringArray.Length/2;x++)
   {
    for(int y=0;y<2;y++)
    {
     this.richTextBox2.Text = this.richTextBox2.Text + twoStringArray[y,x] + \" \";
     if( y == 1)
     {
      this.richTextBox2.Text = this.richTextBox2.Text + \"/r/n\";
     }
    }
   }
  }

/// <summary>
/// 打开方件
/// </summary>
/// <param name=\"sender\"></param>
/// <param name=\"e\"></param>
  private void button2_Click(object sender, System.EventArgs e)// 文件打开的方式。
  {
   openFileDialog1.Filter = \"文本文件(*.txt)|*.txt\";
   openFileDialog1.Title = \"打开要分析的源文件。\";

   if(openFileDialog1.ShowDialog() == DialogResult.OK)
   {
    System.IO.StreamReader sr = new
     System.IO.StreamReader(openFileDialog1.FileName);
    this.richTextBox1.Text = sr.ReadToEnd();
    sr.Close();
   }
  }
/// <summary>
/// 保存文件　
/// </summary>
/// <param name=\"sender\"></param>
/// <param name=\"e\"></param>
  private void button3_Click(object sender, System.EventArgs e)
  {
   saveFileDialog1.Filter = \"文本文件(*.txt)|*.txt\";
   saveFileDialog1.Title = \"保存分析结果.\";
   if(saveFileDialog1.ShowDialog() == DialogResult.OK)
   {
    System.IO.StreamWriter wr = new
     System.IO.StreamWriter(saveFileDialog1.FileName);
    wr.Write(this.richTextBox2.Text);
    wr.Close();   
   }
  }

/// <summary>
/// 引用二维数组和单词的标志j
/// </summary>
/// <param name=\"twoArray\"></param>
/// <param name=\"j\"></param>
  private void oneArrayToTwo(ref string[,] twoArray,ref int j)
  {
 
   string[,] tempArray = twoArray;
   twoArray = new string[2,j+2];
   for(int x=0;x<2;x++)
   {
    for(int y=0;y<j+1;y++)
    {
     twoArray[x,y] = tempArray[x,y];
    }
   }
   j=j+1; 
  }
/// <summary>
/// 引用单词数组，和要加入单词数组的单词
/// </summary>
/// <param name=\"stringArrange\"></param>
/// <param name=\"st\"></param>
  private void stringToArrayString(ref string[] stringArrange, string st)
  {

   if(stringArrange[0] ==\"\")
   {
    stringArrange[0] = st;
   }
   else
   {
    string[] oldA = stringArrange;//刚得到的字符串
    int i=oldA.Length +1;
    stringArrange = new string[i];//申请一个长一个的字符数组。
    oldA.CopyTo(stringArrange,0);//将先前的字符数组考到现在这个数组中。
    stringArrange[stringArrange.Length -1] = st;
   }
  }
/// <summary>
/// 将Text中的字符串，存入一个字符数组中。
/// </summary>
/// <returns></returns>
        private char[] textToCharArray()
  {
   string stringTemp;
   stringTemp = this.richTextBox1.Text;
   char[] getch = stringTemp.ToCharArray();//要处理的字符都在getch这个数组中。
   return getch;
  }
/// <summary>
/// 字符数组 到 单词数组
/// </summary>
/// <param name=\"getch\"></param>
/// <returns></returns>
  private string[] charArrayToStringArray(char[] getch)//将字符数组转变为字符串数组。即词法分析后的单词数组。
  {
   string[] stringArrange={\"\"} ;//用这个字符串数组存放词法分析后得到的单词。
   char charTemp;
   string stringSave = \"\";//  存放一个分析得到的单词

   //一次循环因得到一个单词。
   for(int i = 0;i < getch.Length;i++)
   {
    charTemp = getch[i];
   
    //由字母开头　数字和字母组成的单词。
    if( charTemp >= \\\'a\\\'&&
     charTemp <= \\\'z\\\'
     ||
     charTemp >= \\\'A\\\' &&
     charTemp <= \\\'Z\\\')
    {
     stringSave = charTemp.ToString();
     i = i + 1;
     int test = 0;//判定循环是否结束，1　为结束。
     while(test == 0)
     {
      charTemp = getch[i];
      if( charTemp >= \\\'a\\\'&&
       charTemp <= \\\'z\\\'
       ||
       charTemp >= \\\'A\\\' &&
       charTemp <= \\\'Z\\\'
       ||
       charTemp >= \\\'0\\\' &&
       charTemp <= \\\'9\\\')
      {
       stringSave = stringSave + charTemp.ToString();
       i = i + 1;
      }
      else
       test = 1;
     }
     stringToArrayString(ref stringArrange,stringSave);
    }
    stringSave = \"\";
    //由数字组成的单词。
    if( charTemp >= \\\'0\\\' &&
     charTemp <= \\\'9\\\')
    {
     stringSave = stringSave + charTemp.ToString();
     i = i + 1;
     int test1 = 0;
     while(test1 == 0)
     {
      charTemp = getch[i];
      if( charTemp >= \\\'0\\\' &&
       charTemp <= \\\'9\\\')
      {
       stringSave = stringSave + charTemp.ToString();
       i = i + 1;
      }
      else
       test1 = 1;
     }
      stringToArrayString(ref stringArrange,stringSave);
    }
    stringSave = \"\";
    //由运算符组成的单词。
    if(    charTemp == \\\'+\\\'
     || charTemp == \\\'-\\\'
     || charTemp == \\\'*\\\'
     || charTemp == \\\'/\\\'
     || charTemp == \\\'=\\\'
     || charTemp == \\\'<\\\'
     || charTemp == \\\'>\\\'
     || charTemp == \\\'!\\\')
    {
     stringSave = stringSave + charTemp.ToString();
     i = i + 1;
     int test2 = 0;
     while(test2 == 0)
     {
      charTemp = getch[i];
      if(    charTemp == \\\'+\\\'
       || charTemp == \\\'-\\\'
       || charTemp == \\\'*\\\'
       || charTemp == \\\'/\\\'
       || charTemp == \\\'=\\\'
       || charTemp == \\\'<\\\'
       || charTemp == \\\'>\\\'
       || charTemp == \\\'!\\\')
      {
       stringSave = stringSave + charTemp.ToString();
       i = i + 1;
      }
      else
       test2 = 1;
     }
     stringToArrayString(ref stringArrange,stringSave);
    }
    stringSave = \"\";
    //由介符组成的单词。
    if(   charTemp == \\\'(\\\'
     ||charTemp == \\\')\\\'
     ||charTemp == \\\'{\\\'
     ||charTemp == \\\'}\\\'
     ||charTemp == \\\'[\\\'
     ||charTemp == \\\']\\\'
     ||charTemp == \\\',\\\'
     ||charTemp == \\\':\\\'
     ||charTemp == \\\';\\\'
     ||charTemp == \\\'\"\\\'
     ||charTemp == \\\'/\\\'\\\'
     ||charTemp == \\\'//\\\')
    {
     stringSave = stringSave + charTemp.ToString();
     stringToArrayString(ref stringArrange,stringSave);
    }
   }
   return stringArrange;
  }
/// <summary>
/// 单词数组 到 二维单词数组。
/// </summary>
/// <param name=\"stringArray\"></param>
/// <returns></returns>
  private string[,] stringArrayToTwoStringArray(string[] stringArray)
  {
   //存放单词标识后的结果。
   string [,] twoArray = new string[2,1];
   //单词的标志
   int j=0;

   //每循环一次，把一个单词归于一类，即前面加上一个数字。
   for(int i=0;i<stringArray.Length;i++)
   {
    //保留字 1
    if(    stringArray[i] == \"main\"
     || stringArray[i] == \"int\"
     || stringArray[i] == \"float\"
     || stringArray[i] == \"printf\"
     || stringArray[i] == \"if\"
     || stringArray[i] == \"for\"
     || stringArray[i] == \"while\"
     || stringArray[i] == \"do\"
     || stringArray[i] == \"return\"
     || stringArray[i] == \"break\"
     || stringArray[i] == \"continue\")
    {
     twoArray[0,j] = \"1\";
     twoArray[1,j] = stringArray[i];
     this.oneArrayToTwo(ref twoArray,ref j);
    }
    //运算符 2
    else
    if( stringArray[i] == \"+\"
     || stringArray[i] == \"-\"
     || stringArray[i] == \"*\"
     || stringArray[i] == \"/\"
     || stringArray[i] == \">\"
     || stringArray[i] == \"<\"
     || stringArray[i] == \">=\"
     || stringArray[i] == \"<=\"
     || stringArray[i] == \"!=\"
     || stringArray[i] == \"==\"
     || stringArray[i] == \"++\"
     || stringArray[i] == \"--\"
     || stringArray[i] == \"=\")
    {
     twoArray[0,j] = \"2\";
     twoArray[1,j] = stringArray[i];
     this.oneArrayToTwo(ref twoArray,ref j);
    }
    //分隔符 3
    else
    if( stringArray[i] == \"(\"
     || stringArray[i] == \")\"
     || stringArray[i] == \"{\"
     || stringArray[i] == \"}\"
     || stringArray[i] == \"[\"
     || stringArray[i] == \"]\"
     || stringArray[i] == \",\"
     || stringArray[i] == \";\"
     || stringArray[i] == \":\"
     || stringArray[i] == \"/\"\"
     || stringArray[i] == \"/*\"
     || stringArray[i] == \"*/\")
    {
     twoArray[0,j] = \"3\";
     twoArray[1,j] = stringArray[i];
     this.oneArrayToTwo(ref twoArray,ref j);
    }
    //数字 4
    else
    if( stringArray[i].ToCharArray()[0] >=\\\'0\\\' &&
     stringArray[i].ToCharArray()[0] <= \\\'9\\\')
    {
     twoArray[0,j] = \"4\";//数字
     twoArray[1,j] = stringArray[i];
     this.oneArrayToTwo(ref twoArray,ref j);
    }
    //其它 5(变量等)
    else
    {
     twoArray[0,j] = \"5\";
     twoArray[1,j] = stringArray[i];
     this.oneArrayToTwo(ref twoArray,ref j);
    }
   }
   return twoArray;
  }

 }
}