a subclass uses the keyword base to invoke a particular subclass constructor : base « Class « C# / CSharp Tutorial

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C# / CSharp Tutorial » Class » base 
7.25.3.a subclass uses the keyword base to invoke a particular subclass constructor
using System;

public class Class1 {
    public static void Main(string[] args) {
        SubClass sc1 = new SubClass();

        SubClass sc2 = new SubClass(12);

    }
}

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);
    }
}
7.25.base
7.25.1.Using base to Access a Hidden Name
7.25.2.Use base keyword to access field in the base class
7.25.3.a subclass uses the keyword base to invoke a particular subclass constructor
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