C# Base - c# - c# tutorial - c# net




What is Base keyword in C# ?

  • In C#, base keyword is used to access fields, constructors and methods of base class.
  • You can use base keyword within instance method, constructor or instance property accessor only.
  • You can't use it inside the static method.
base class in csharp

base class and dervied class in csharp

C# base keyword: accessing base class field

  • We can use the base keyword to access the fields of the base class within derived class.
  • It is useful if base and derived classes have the same fields.
  • If derived class doesn't define same field, there is no need to use base keyword.
  • Base class field can be directly accessed by the derived class.
  • Let's see the simple example of base keyword in C# which accesses the field of base class.
using System;  
public class Animal{  
public string color = "white";  
}  
public class Dog: Animal  
{  
string color = "black";  
public void showColor()  
{  
Console.WriteLine(base.color); 
Console.WriteLine(color);  
}  

}  
public class TestBase  
{  
public static void Main()  
{  
Dog d = new Dog();  
d.showColor();  
}  
}  

C# examples - Output :

white
black

C# base keyword example: calling base class method

  • By the help of base keyword, we can call the base class method also.
  • It is useful if base and derived classes defines same method. In other words, if method is overridden.
  • If derived class doesn't define same method, there is no need to use base keyword. Base class method can be directly called by the derived class method.
  • Let's see the simple example of base keyword which calls the method of base class.
using System;  
public class Animal{  
public virtual void eat(){  
Console.WriteLine("eating...");  
}  
}  
public class Dog: Animal  
{  
public override void eat()  
{  
base.eat();  
Console.WriteLine("eating bread...");  
}  

}  
public class TestBase
{  
public static void Main()  
{  
Dog d = new Dog();  
d.eat();  
}  
}  

C# examples - Output :

eating...
eating bread...

C# inheritance: calling base class constructor internally

  • Whenever you inherit the base class, base class constructor is internally invoked. Let's see the example of calling base constructor.
using System;  
public class Animal{  
public Animal(){  
Console.WriteLine("animal...");  
}  
}  
public class Dog: Animal  
{  
public Dog()  
{  
Console.WriteLine("dog...");  
}  

}  
public class TestOverriding  
{  
public static void Main()  
{  
Dog d = new Dog();  

}  
}  

C# examples - Output :

animal...
dog...

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