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      • c#教程之C#語言特點

      • 2015-01-21 14:21 來源:未知

      1.1       C#語言特點(相關C#教程)
      Microsoft.NET(以下簡稱.NET)框架是微軟提出的新一代Web軟件開發模型,C#語言是.NET框架中新一代的開發工具。C#語言是一種現代、面向對象的語言,它簡化了C++語言在類、命名空間、方法重載和異常處理等方面的操作,它摒棄了C++的復雜性,更易使用,更少出錯。它使用組件編程,和VB一樣容易使用。C#語法和C++JAVA語法非常相似,如果讀者用過C++JAVA,學習C#語言應是比較輕松的。

      C#語言編寫的源程序,必須用C#語言編譯器將C#源程序編譯為中間語言(MicroSoft Intermediate Language,MSIL)代碼,形成擴展名為exedll文件。中間語言代碼不是CPU可執行的機器碼,在程序運行時,必須由通用語言運行環境(Common Language RuntimeCLR)中的既時編譯器(JUST IN TimeJIT)將中間語言代碼翻譯為CPU可執行的機器碼,由CPU執行。CLRC#語言中間語言代碼運行提供了一種運行時環境,C#語言的CLRJAVA語言的虛擬機類似。這種執行方法使運行速度變慢,但帶來其它一些好處,主要有:
      通用語言規范(Common Language SpecificationCLS).NET系統包括如下語言:C#C++VBJ#,他們都遵守通用語言規范。任何遵守通用語言規范的語言源程序,都可編譯為相同的中間語言代碼,由CLR負責執行。只要為其它操作系統編制相應的CLR,中間語言代碼也可在其它系統中運行。
      自動內存管理:CLR內建垃圾收集器,當變量實例的生命周期結束時,垃圾收集器負責收回不被使用的實例占用的內存空間。不必象CC++語言,用語句在堆中建立的實例,必須用語句釋放實例占用的內存空間。也就是說,CLR具有自動內存管理功能。
      交叉語言處理:由于任何遵守通用語言規范的語言源程序,都可編譯為相同的中間語言代碼,不同語言設計的組件,可以互相通用,可以從其它語言定義的類派生出本語言的新類。由于中間語言代碼由CLR負責執行,因此異常處理方法是一致的,這在調試一種語言調用另一種語言的子程序時,顯得特別方便。
      增加安全:C#語言不支持指針,一切對內存的訪問都必須通過對象的引用變量來實現,只允許訪問內存中允許訪問的部分,這就防止病毒程序使用非法指針訪問私有成員。也避免指針的誤操作產生的錯誤。CLR執行中間語言代碼前,要對中間語言代碼的安全性,完整性進行驗證,防止病毒對中間語言代碼的修改。
      版本支持:系統中的組件或動態聯接庫可能要升級,由于這些組件或動態聯接庫都要在注冊表中注冊,由此可能帶來一系列問題,例如,安裝新程序時自動安裝新組件替換舊組件,有可能使某些必須使用舊組件才可以運行的程序,使用新組件運行不了。在.NET中這些組件或動態聯接庫不必在注冊表中注冊,每個程序都可以使用自帶的組件或動態聯接庫,只要把這些組件或動態聯接庫放到運行程序所在文件夾的子文件夾bin中,運行程序就自動使用在bin文件夾中的組件或動態聯接庫。由于不需要在注冊表中注冊,軟件的安裝也變得容易了,一般將運行程序及庫文件拷貝到指定文件夾中就可以了。
      完全面向對象:不象C++語言,即支持面向過程程序設計,又支持面向對象程序設計,C#語言是完全面向對象的,在C#中不再存在全局函數、全局變量,所有的函數、變量和常量都必須定義在類中,避免了命名沖突。C#語言不支持多重繼承。
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