Chained Delegate : Chained delegate « delegate « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. delegate
3. Chained delegate

using System;

public delegate double ComputeDelegate( double x,double y );

public class MyClass
{
    public MyClass( ) {
    }

    public double Add( double x, double y ) {
        double result = x+y;
        Console.WriteLine( "InstanceResults: {0}", result );
        return result;
    }

    public static double Subtract( double x,double y ) {
        double result = x - y;
        Console.WriteLine( "StaticResult: {0}", result );
        return result;
    }

    private double factor;
}

public class MainClass
{
    static void Main() {
        MyClass proc1 = new MyClass( );
        MyClass proc2 = new MyClass( );

        ComputeDelegate[] delegates = new ComputeDelegate[] {
            new ComputeDelegate( proc1.Add ),
            new ComputeDelegate( proc2.Add ),
            new ComputeDelegate( MyClass.Subtract )
        };

        ComputeDelegate chained = (ComputeDelegate) Delegate.Combine( delegates );

        double combined = chained( 4, 5 );
        
        Console.WriteLine( "Output: {0}", combined );
    }
}

InstanceResults: 9
InstanceResults: 9
StaticResult: -1
Output: -1