C# – Base keyword

The base Keyword

Accessing members of the base class from within a derived class.

Calling a base-class constructor when creating instance of the derived class.

With base keyword we access base class property non-virtually.

With base we call a method on the base class that has been overridden by another method.

base class is permitted only in a constructor, instance method, instance property accessor.

You cannot use base keyword from within static method.

public class Person
{
    protected string ssn = "555-55-5555";
    protected string name = "John L. Doe";

    public virtual void GetInfo()
    {
        Console.WriteLine("Name: {0}", name);
        Console.WriteLine("SSN: {0}", ssn);
    }
}
class Employee : Person
{
    public string id = "ABC567EFG";
    public override void GetInfo()
    {
        // Calling the base class GetInfo method:
        base.GetInfo();
        Console.WriteLine("Employee ID: {0}", id);
    }
}

class TestClass
{
    static void Main()
    {
        Employee E = new Employee();
        E.GetInfo();
    }
}
/*
Output
Name: John L. Doe
SSN: 555-55-5555
Employee ID: ABC567EFG
*/

static void Main()
{
	House mansion = new House { Name="McMansion", Mortgage=250000 };
	Console.WriteLine (mansion.Liability);      // 250000
}

public class Asset
{
	public string Name;
	public virtual decimal Liability => 0;		// Virtual
}

public class House : Asset
{
	public decimal Mortgage;
	public override decimal Liability => base.Liability + Mortgage;  //using base keyword
}

public class Stock : Asset
{
	public long SharesOwned;
	// We won't override Liability here, because the default implementation will do.
}