Delegates and Lambdas

Func and Action

Func returns a value, while Action performs work without returning one.

Func and Action

FuncAction.cs 
using System;

class Program
{
    static void Main()
    {
        string word = ;
        Func<string, string> bracket = text => "[" + text + "]";
        string output = "";
        Action<string> save = text => output = text;

        save(bracket(word));

        Console.WriteLine($"word={word}");
        Console.WriteLine($"output={output}");
    }
}

using System;

class Program
{
    static void Main()
    {
        string word = ;
        Func<string, string> bracket = text => "[" + text + "]";
        string output = "";
        Action<string> save = text => output = text;

        save(bracket(word));

        Console.WriteLine($"word={word}");
        Console.WriteLine($"output={output}");
    }
}

using System;

class Program
{
    static void Main()
    {
        string word = ;
        Func<string, string> bracket = text => "[" + text + "]";
        string output = "";
        Action<string> save = text => output = text;

        save(bracket(word));

        Console.WriteLine($"word={word}");
        Console.WriteLine($"output={output}");
    }
}
Func and Action `Func` delegates return values, and `Action` delegates return `void`.