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C SHARP PROGRAMLAMA DILI

Last update: 10/7/2014 9:57:00 PM

Yazan:Fatih KABAKCI

C#(Sharp) programlama dili 2000'li yillarin basinda Microsoft tarafindan .NET platformu icin ortaya cikarilmis bir dildir.Bu dil Anders Hejlsberg liderliginde tasinabilirlik ve .Net alt yapisina uygun bir dil gelistirme amaciyla tasarlanmistir.

C# programlama dili Nesneye Dayali Programlama felsefesini daha onceden ortaya cikan C++ programlama dilinden almaktadir.C# ayni zamanda Java programlama dili ile de soz dizimi ve hedefleri dogrultusunda yakindan iliskilidir.Java'nin tasinabilirlik sorunlarina iliskin Bytecode cozumu C# dilinde de gorulmektedir.

Bir C# programi ilk kez derlenirken once yorumlanir.Yorumlanan kod Common Intermadiate Language,daha resmi ifade ile Microsoft Intermadiate Language adini almaktadir.Boylelikle ara forma yorumlanmis bir dil ortaya cikar.Bu cikan dil ise platform bagimsizligi modelini ortaya cikarmis olur.Yorumlanan bu ara dil bir JIT(Just In Time) derleyici ile derlenerek nihai dogal kod(native code) ortaya cikmis olur. 
Kaynak Kod(Source Code) ----- Yorumlanir -----
Ara dil(MSIL)           ----- Derlenir -----
Dogal Kod(Native Code)  ----- Calistirilir -----
.exe
Bir C# programinda bulunan temel yapi ise asagida gosterildigi gibidir. 
class Helloworld
      static void Main()
{
System.Console.WriteLine("Hello world");
}
}
Yukaridaki yapiya bakildiginda class anahtar sozcugu ile Helloworld adinda bir sinif yaratilir.C# programlama dilinde,Javadan farkli olarak sinif adlari dosya adlari ile ayni olmak zorunda degildir.Yani dosya adi derleme surecleri arasinda yer almaz.

Main() bir C# programinda ilk calisan metottur.static olmasi bu metodun cagirilirken bir nesneye ihtiyac duymadigi anlamina gelirken,void dondurum tipi ise bu metodun geriye hic bir sey dondurmeyecegi anlamina gelmektedir.Bu program ekrana "Hello world" ibaresi yazmaktadir.Bunu ise Console sinifinin WriteLine() metodu ile yapar.System sinifi ise C#in yerlesik kutuphanelerinden birisidir ve System ad uzayi ile cagirilmaktadir.

Birden fazla System ad uzayinin kullanildigi bir C# programinda using anahtar sozcugunu kullanarak bu ismi yazmaktan kurtulabilirsiniz. 
using System;
class Helloworld
      static span style="color:blue;">void Main()
{
Console.WriteLine("Hello world");
}
}
Programlarinizda cogunlukla bu ve buna benzer ad uzaylari(namespace) kullanacaginiz icin yukaridaki 2.versiyon program onerilir.Profesyonel C# programcilari genelde 2.yazilan program stilini kullanir.
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