Csharp/CSharp Tutorial/Class/base

a subclass uses the keyword base to invoke a particular subclass constructor

<source lang="csharp">using System; public class Class1 {

   public static void Main(string[] args) {
       SubClass sc1 = new SubClass();
       SubClass sc2 = new SubClass(1, 2);
   }

} public class BaseClass {

   public BaseClass() {
       Console.WriteLine("Constructing BaseClass (default)");
   }
   public BaseClass(int i) {
       Console.WriteLine("Constructing BaseClass({0})", i);
   }

} public class SubClass : BaseClass {

   public SubClass() {
       Console.WriteLine("Constructing SubClass (default)");
   }
   public SubClass(int i1, int i2)
       : base(i1) {
       Console.WriteLine("Constructing SubClass({0}, {1})",
                                                 i1, i2);
   }

}</source>

Use base keyword to access field in the base class

<source lang="csharp">using System; class BaseClass {

  public string Field1 = "In the base class";

} class DerivedClass : BaseClass {

  new public string Field1 = "In the derived class";
  public void Display()
  {
     Console.WriteLine("{0}", Field1);              // Access the derived class.
     Console.WriteLine("{0}", base.Field1);         // Access the base class.
  }

} class Program {

  static void Main()
  {
     DerivedClass oc = new DerivedClass();
     oc.Display();
  }

}</source>

In the derived class
In the base class

Using base to Access a Hidden Name

"base" refers to the base class of the derived class in which it is used.

This usage has the following general form:

<source lang="csharp">base.member</source>