create function c# code example

Example 1: How to make a function in C#

public void SayHello(string name) 
{
    Console.WriteLine("Hello")  
}


Console.WriteLine("What is your name?")
string name = Console.ReadLine() ; 

SayHello(Adam)

Example 2: c# functions

/* Answer to: "c# functions" */

/*
  A function has the following syntax:
  <modifiers> <return-type> method-name(parameter-list)
  
  You can use the following modifiers with a local function:
  - async
  - unsafe
  - static (in C# 8.0 and later). A static local function can't capture local
  	variables or instance state.
  - extern (in C# 9.0 and later). An external local function must be static.
  
  There's an example below:
*/

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine(square(4)); // Returns '16'
		Console.WriteLine(cube(4)); // Returns '64'
	}
	
	public static int square(int n)
	{
		return n * n;
	}
	
	public static int cube(int n)
	{
		return n * n * n;
	}
}

Example 3: c# funtion

public int AddNumbers(int number1, int number2){    int result = number1 + number2;    if(result > 10)    {    return result;    }    return 0;}

Example 4: function c#

public int AddNumbers(int number1, int number2)
{
    int result = number1 + number2;
    return result;
}

Example 5: c# func

using System;
using System.Collections.Generic;
using static System.Console;
namespace CSFlow.Delegates.Others
{
    public class ActionFunc
    {

        public static void Run ()
        {
            // Example of : Action
            // Use action when a mathod return void
            Action<string> display = new Action<string>(DisplayMessage);
            display("Calculate Discount :");

            // Example of : Func
            // Use action when a mathod return value
            Func<double, double> discount = new Func<double, double>(Discount);
            display(discount(12.5).ToString());

            List<Customer> custList = new List<Customer>();
            custList.Add(new Customer { Id = 1, FirstName = "Joydip", LastName = "Kanjilal", State = "Telengana", City = "Hyderabad", Address = "Begumpet", Country = "India" });
            custList.Add(new Customer { Id = 2, FirstName = "Steve", LastName = "Jones", State = "OA", City = "New York", Address = "Lake Avenue", Country = "US" });
            custList.Add(new Customer { Id = 3, FirstName = "Sefat", LastName = "Anam", State = "OSA", City = "New York", Address = "Manhatten", Country = "US" });

            // Example of : Predicate
            // Use Predicate for search data
            Predicate<Customer> FindAddress = customer => customer.Address == "Manhatten";

            Customer searchData = custList.Find(FindAddress);

            display($"{searchData?.FirstName} {searchData?.LastName} From - {searchData?.City} ");

            ReadKey();
        }

        static void DisplayMessage (string message)
        {
            WriteLine(message);
        }

        static double Discount (double money)
        {
            return money * .5;
        }

        class Customer
        {
            public int Id { get; set; }
            public string FirstName { get; set; }
            public string LastName { get; set; }
            public string Address { get; set; }
            public string City { get; set; }
            public string State { get; set; }
            public string Country { get; set; }
        }
    }
}