C# Data Structures and Algorithms

Delegates

The delegate reference type allows specification of the required signature of a method. The delegate could then be instantiated, as well as invoked, as shown in the following code:

delegate double Mean(double a, double b, double c); 
 
static double Harmonic(double a, double b, double c) 
{ 
    return 3 / ((1 / a) + (1 / b) + (1 / c)); 
} 
 
static void Main(string[] args) 
{ 
    Mean arithmetic = (a, b, c) => (a + b + c) / 3; 
    Mean geometric = delegate (double a, double b, double c) 
    { 
        return Math.Pow(a * b * c, 1 / 3.0); 
    }; 
    Mean harmonic = Harmonic; 
    double arithmeticResult = arithmetic.Invoke(5, 6.5, 7); 
    double geometricResult = geometric.Invoke(5, 6.5, 7); 
    double harmonicResult = harmonic.Invoke(5, 6.5, 7); 
} 

In the example, the Mean delegate ...