Answers for "c# function delegate"

delegate function c#

// Create the Delgate method.
public delegate void Del(string message);

// Create a method for a delgate.
public static void DelegateMethod(string message)
{
  Console.WriteLine(message);
}

// Instatiate the delegate.
Del hadler = DelegateMethod;

// Call the delegate.
hadler("Hello World");

// Output
// Hello World

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; }
        }
    }
}

c# delegate

// Declare a delegate type
public delegate double MyDelegateType(double x);

// Define some consummer that uses functions of the delegate type
public double Consummer(double x, MyDelegateType f){
    return f(x);
}


//...


// Define a function meant to be passed to the consummer 
// The only requirement is that it matches the signature of the delegate
public double MyFunctionMethod(double x){
    // Can add more complicated logic here
    return x;
}
// In practice now
public void Client(){
    double result = Consummer(1.234, x => x * 456.1234);
    double secondResult = Consummer(2.345, MyFunctionMethod);
}

c# delegate func

Func<string, string> convert = delegate(string s)
    { return s.ToUpper();};

 string name = "Dakota";
 Console.WriteLine(convert(name));

// This code example produces the following output:
//
//    DAKOTA