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      • c#教程之類的基本概念

      • 2015-01-21 15:04 來源:未知

           類的基本概念(相關C#教程)
      C#語言是一種現代、面向對象的語言。面向對象程序設計方法提出了一個全新的概念:類,它的主要思想是將數據(數據成員)及處理這些數據的相應方法(函數成員)封裝到類中,類的實例則稱為對象。這就是我們常說的封裝性。

       類的基本概念

      類可以認為是對結構的擴充,它和C中的結構最大的不同是:類中不但可以包括數據,還包括處理這些數據的函數。類是對數據和處理數據的方法(函數)的封裝。類是對某一類具有相同特性和行為的事物的描述。例如,定義一個描述個人情況的類Person如下:
      using System;
      class Person//類的定義,class是保留字,表示定義一個類,Person是類名
      {  private string name="張三";//類的數據成員聲明
      private int age=12;//private表示私有數據成員
      public void Display()//類的方法(函數)聲明,顯示姓名和年齡
      {  Console.WriteLine("姓名:{0},年齡:{1}",name,age);
      }
      public void SetName(string PersonName)//修改姓名的方法(函數)
      {    name=PersonName;
      }
      public void SetAge(int PersonAge)
      {    age=PersonAge;
      }
      }
      Console.WriteLine("姓名:{0},年齡:{1}",name,age)的意義是將第二個參數變量name變為字符串填到{0}位置,將第三個參數變量age變為字符串填到{1}位置,將第一個參數表示的字符串在顯示器上輸出。
      大家注意,這里我們實際定義了一個新的數據類型,為用戶自己定義的數據類型,是對個人的特性和行為的描述,他的類型名為Person,和intchar等一樣為一種數據類型。用定義新數據類型Person類的方法把數據和處理數據的函數封裝起來。類的聲明格式如下:
      屬性 類修飾符 class 類名{類體}
      其中,關鍵字class、類名和類體是必須的,其它項是可選項。類修飾符包括newpublicprotectedinternalprivateabstractsealed,這些類修飾符以后介紹。類體用于定義類的成員。

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