Question

How to use and Invoke Func generic type in C#

Answer 1

using System;

public class Program
{
    public static void Main(string[] args)
    {
        Func<int, string> func1 = (n) => string.Format("return string: {0}", n);
 
        Func<bool, int, string> func2 = (b, n) =>
                                       string.Format("return string: {0} and {1}", b, n);
 
        Func<double> func3 = () => Math.PI;
 
        Func<string, string> func4 = (n) => string.Format("return string: {0}", n);
 
        Console.WriteLine(func1.Invoke(13));
        Console.WriteLine(func2.Invoke(true, 10));
        Console.WriteLine(func3.Invoke());
        Console.WriteLine(func4.Invoke("c#"));
    }
}



/*
run:

return string: 13
return string: True and 10
3.14159265358979
return string: c#

*/

 

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Answer 2

using System;

public class Program
{
    public static void Main(string[] args)
    {
        Func<int, int> func1 = n => n + 1;
 
        Func<int, int> func2 = n => { return n + 1; };
 
        Func<int, int> func3 = n => ++n;
 
        Func<int, int, int> func4 = (x, y) => x * y;
 
        Action func5 = () => Console.WriteLine();
 
        Console.WriteLine(func1.Invoke(12));
        Console.WriteLine(func2.Invoke(5));
        Console.WriteLine(func3.Invoke(3));
        Console.WriteLine(func4.Invoke(6, 7));
        
        func5.Invoke();
    }
}



/*
run:

13
6
4
42

*/

 

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