c# delegate

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ekkamrit answered on April 29, 2020 Popularity 9/10 Helpfulness 1/10

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c# delegate

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//c# delegate
//delegates are type-safe Pointers to Methods.
// example
using System;

public class Program{
	// define delegate
	public delegate void subtraction(int a, int b);
	
  	//define method that you want to point to that delegate
	public void sub_numbers(int c, int d){
		Console.WriteLine($"Sub of two numbers is {c-d}");
	}
  
	public static void Main(){
      	// instantiate class
		var p = new Program();
      	// instantiate delegate and pass method as parameter
        // in which you want to point
		var del_sub = new subtraction(p.sub_numbers);
      	
      	// call delegate and pass the parameter
		del_sub(50,20); // output: Sub of two numbers is 30
	}
}

Popularity 9/10 Helpfulness 1/10 Language csharp

Source: dotnetfiddle.net

Tags: c#

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Contributed on May 03 2022

ekkamrit

0 Answers Avg Quality 2/10

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C# delegate

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    using System;

	public class CargoAircraft
    {
      	// Create a delegate type (no return no arguments)
        public delegate void CheckQuantity();
		// Create an instance of the delegate type
        public CheckQuantity ProcessQuantity;

        public void ProcessRequirements()
        {
          // Call the instance delegate
          // Will invoke all methods mapped
            ProcessQuantity();
        }
    }

    public class CargoCounter
    {
        public void CountQuantity() { }
    }

    class Program
    {
        static void Main(string[] args)
        {
            CargoAircraft cargo = new CargoAircraft();
            CargoCounter cargoCounter = new CargoCounter();
			
          	// Map a method to the created delegate
            cargo.ProcessQuantity += cargoCounter.CountQuantity;
          	
          	// Will call instance delegate invoking mapped methods
            cargo.ProcessRequirements();
        }
    }
}

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: Grepper

Tags: c# c

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Contributed on Apr 29 2020

Crazy Chinchilla

0 Answers Avg Quality 2/10

how to create a delegate in c#

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//the delegate can point to a void function and takes a string parameter
delegate void Del(string str);

public void hello(string Name)
{
 	Console.WriteLine("hello " + Name) ;
}
public static void main()
{
  //you need to declare the delegate type above and give it a function
  //that matches the delegate's funcion 
  Del HelloDelegate = new Del(hello);
  HelloDelegate("IC");
}
/// (output) -> "hello IC"

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Source: Grepper

Tags: c# c

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Contributed on Jan 04 2022

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delegate in C#

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<access_modifier> delegate <return_type> DelegateName([list_of_parameters]);

Popularity 9/10 Helpfulness 4/10 Language csharp

Source: learningneverendstech.com

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Contributed on Jun 22 2022

Healthy Hyena

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delegates in c#

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//A delegate is an object that knows how to call a method.
delegate int Transformer (int x);
//Transformer is compatible with any method 
//with an int return type and a single int parameter,
int Square (int x) 
{ 
  return x * x; 
}
//Or, more tersely:
int Square (int x) => x * x;
//Assigning a method to a delegate variable creates a delegate instance:
Transformer t = Square;
//You can invoke a delegate instance in the same way as a method:
int answer = t(3);    // answer is 9

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Source: learning.oreilly.com

Tags: c# c

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Contributed on May 18 2022

PrashantUnity

0 Answers Avg Quality 2/10

c# delegate example

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using System;

// Example delegate declaration
delegate void OperationDelegate(int a, int b);

public class Calculator
{
    public static void Add(int a, int b)
    {
        Console.WriteLine($"{a} + {b} = {a + b}");
    }

    public static void Subtract(int a, int b)
    {
        Console.WriteLine($"{a} - {b} = {a - b}");
    }

    public static void Multiply(int a, int b)
    {
        Console.WriteLine($"{a} * {b} = {a * b}");
    }

    public static void Divide(int a, int b)
    {
        if (b != 0)
        {
            Console.WriteLine($"{a} / {b} = {a / b}");
        }
        else
        {
            Console.WriteLine("Division by zero is not allowed.");
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        // Creating instances of the delegate and associating methods
        OperationDelegate operation = Calculator.Add;
        operation += Calculator.Subtract;
        operation += Calculator.Multiply;
        operation += Calculator.Divide;

        // Invoking the delegate
        operation.Invoke(10, 5);
    }
}

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Contributed on Sep 12 2023

YOU.com

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delegates in c#

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// Declare a delegate with a specific signature
delegate void MyDelegate(string message);

class Program
{
    static void Main()
    {
        // Create an instance of the delegate and associate it with a method
        MyDelegate delegateInstance = DisplayMessage;

        // Invoke the method via the delegate
        delegateInstance("Hello, delegates!");

        // You can also use the delegate to invoke different methods
        delegateInstance = DisplayAnotherMessage;
        delegateInstance("Greetings!");

        // Delegates can be combined using the "+" operator
        MyDelegate multiDelegate = DisplayMessage;
        multiDelegate += DisplayAnotherMessage;

        // Invoking a multicast delegate calls all associated methods
        multiDelegate("Multiple methods!");

        // Delegates can be removed using the "-" operator
        multiDelegate -= DisplayMessage;

        // Invoking the multicast delegate now calls only one method
        multiDelegate("Single method!");
    }

    static void DisplayMessage(string message)
    {
        Console.WriteLine("DisplayMessage: " + message);
    }

    static void DisplayAnotherMessage(string message)
    {
        Console.WriteLine("DisplayAnotherMessage: " + message);
    }
}

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Source: chat.openai.com

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Contributed on Jun 19 2023

Amann

0 Answers Avg Quality 2/10

C# delegate

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DelegateTest : MonoBehaviour
{
    public delegate void TestDelegate();

    private TestDelegate testDelegate;

    
    // Start is called before the first frame update
    void Start()
    {
        testDelegate = MyDelegateFunc;

        testDelegate();
    }

    // Update is called once per frame
    void Update()
    {
        
    }


    private void MyDelegateFunc()
    {
        Debug.Log("My DelegateFunc");
    }
}

Popularity 9/10 Helpfulness 2/10 Language csharp

Source: Grepper

Tags: c#

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Contributed on Jun 26 2022

Jerry Tung

0 Answers Avg Quality 2/10

C# delegates

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DelegateApp {

  /// <summary>
  /// A class to define a person
  /// </summary>
  public class Person {
    public string Name { get; set; }
    public int Age { get; set; }
  }

  class Program {
    //Our delegate
    public delegate bool FilterDelegate(Person p);

    static void Main(string[] args) {

      //Create 4 Person objects
      Person p1 = new Person() { Name = "John", Age = 41 };
      Person p2 = new Person() { Name = "Jane", Age = 69 };
      Person p3 = new Person() { Name = "Jake", Age = 12 };
      Person p4 = new Person() { Name = "Jessie", Age = 25 };

      //Create a list of Person objects and fill it
      List<Person> people = new List<Person>() { p1, p2, p3, p4 };

      //Invoke DisplayPeople using appropriate delegate
      DisplayPeople("Children:", people, IsChild);
      DisplayPeople("Adults:", people, IsAdult);
      DisplayPeople("Seniors:", people, IsSenior);

      Console.Read();
    }

    /// <summary>
    /// A method to filter out the people you need
    /// </summary>
    /// <param name="people">A list of people</param>
    /// <param name="filter">A filter</param>
    /// <returns>A filtered list</returns>
    static void DisplayPeople(string title, List<Person> people, FilterDelegate filter) {
      Console.WriteLine(title);

      foreach (Person p in people) {
        if (filter(p)) {
          Console.WriteLine("{0}, {1} years old", p.Name, p.Age);
        }
      }

      Console.Write("\n\n");
    }

    //==========FILTERS===================
    static bool IsChild(Person p) {
      return p.Age < 18;
    }

    static bool IsAdult(Person p) {
      return p.Age >= 18;
    }

    static bool IsSenior(Person p) {
      return p.Age >= 65;
    }
  }
}

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Source: stackoverflow.com

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Contributed on Sep 19 2022

julian shaw

0 Answers Avg Quality 2/10

c# delegate

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DelegateDemo : MonoBehaviour {
	public delegate void Del(string msg); 

	void Start(){
		Del SampleDel;

		SampleDel = PrintMsg;
		SampleDel += Debug.Log; //using plus sign we can subscribe multiple methods to trigger events. 
		SampleDel("Hello Shrinath..."); //when this is called, all the methods subscribed to this delegate gets called
	}

	void PrintMsg(string msg1){
		Debug.Log ("msg : " + msg1);
	}
}

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Source: Grepper

Tags: c#

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Contributed on Jun 08 2022

Shrinath Kopare

0 Answers Avg Quality 2/10

c# delegate

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public delegate int PerformCalculation(int x, int y);

Popularity 8/10 Helpfulness 1/10 Language csharp

Source: learn.microsoft.com

Tags: c#

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Contributed on Nov 30 2022

Solstice

0 Answers Avg Quality 2/10

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