C# 2.0学习之--集合1

布满荆棘的人生 2021-12-22 18:01 224阅读 0赞

编译与执行：

<table> 
 <tbody> 
  <tr> 
   <td colspan="2"> <pre>csc tokens.cs
            tokens</pre> </td> 
  </tr> 
 </tbody> 
</table>

tokens.cs :  
  
  
//Copyright (C) Microsoft Corporation.  All rights reserved.

// tokens.cs  
using System;  
// The System.Collections namespace is made available:  
using System.Collections;

// Declare the Tokens class:  
public class Tokens : IEnumerable  
\{  
   private string\[\] elements;

Tokens(string source, char\[\] delimiters)  
   \{  
      // Parse the string into tokens:  
      elements = source.Split(delimiters);  
   \}

// IEnumerable Interface Implementation:  
   //   Declaration of the GetEnumerator() method  
   //   required by IEnumerable  
   public IEnumerator GetEnumerator()  
   \{  
      return new TokenEnumerator(this);  
   \}

// Inner class implements IEnumerator interface:  
   private class TokenEnumerator : IEnumerator  
   \{  
      private int position = -1;  
      private Tokens t;

public TokenEnumerator(Tokens t)  
      \{  
         this.t = t;  
      \}

// Declare the MoveNext method required by IEnumerator:  
      public bool MoveNext()  
      \{  
         if (position < t.elements.Length - 1)  
         \{  
            position++;  
            return true;  
         \}  
         else  
         \{  
            return false;  
         \}  
      \}

// Declare the Reset method required by IEnumerator:  
      public void Reset()  
      \{  
         position = -1;  
      \}

// Declare the Current property required by IEnumerator:  
      public object Current  
      \{  
         get  
         \{  
            return t.elements\[position\];  
         \}  
      \}  
   \}

// Test Tokens, TokenEnumerator

static void Main()  
   \{  
      // Testing Tokens by breaking the string into tokens:  
      Tokens f = new Tokens("This is a well-done program.",  
         new char\[\] \{' ','-'\});  
      foreach (string item in f)  
      \{  
         Console.WriteLine(item);  
      \}  
   \}  
\}

转载于:https://www.cnblogs.com/llbofchina/archive/2006/06/23/434152.html