---
title: "Explain the concept of delegates and events in C# and provide examples of their practical use?"  
description: "Explain the concept of delegates and events in C# and provide examples of their practical use?"  
author: "Steilla Mitchel"  
published: 2023-09-12  
updated: 2023-09-25  
canonical: https://www.mindstick.com/forum/159865/explain-the-concept-of-delegates-and-events-in-c-sharp-and-provide-examples-of-their-practical-use  
category: "c#"  
tags: ["c#", "delegates"]  
reading_time: 4 minutes  

---

# Explain the concept of delegates and events in C# and provide examples of their practical use?

[Explain](https://www.mindstick.com/forum/157854/what-is-system-debugging-explain-some-system-debugging-tools-used-in-modern-computer-systems) the [concept of delegates](https://www.mindstick.com/forum/159976/explain-the-concept-of-delegates-and-events-in-c-sharp) and [events in C#](https://www.mindstick.com/forum/33767/events-in-c-sharp) and provide examples of their [practical](https://answers.mindstick.com/blog/54/minimal-apis-in-dot-net-a-practical-guide) use.

## Replies

### Reply by Aryan Kumar

[delegates and events](https://www.mindstick.com/forum/160718/difference-between-delegates-and-events-in-c-sharp) be fundamental concepts in C# for implementin' the publish-subscribe model, which be critical for building responsive and event-driven applications. Let me explain these concepts and provide examples of their practical use:

**Delegates**:

A delegate be a type that represents references to methods with a specific signature. In other words, it be a way to pass around references to functions as if they were objects. Delegates be particularly useful for callback mechanisms and decoupling components in an application.

**Practical Use of Delegates**:

Here's an example of how delegates can be practically used:

```plaintext
// Define a delegate with a specific signature (matching methods that take an int parameter and return void).
public delegate void MyDelegate(int value);

public class Calculator
{
    // Create an instance of the delegate.
    public MyDelegate CalculationPerformed;

    public int Add(int a, int b)
    {
        int result = a + b;

        // Invoke the delegate to notify subscribers.
        CalculationPerformed?.Invoke(result);

        return result;
    }
}

public class Program
{
    public static void Main()
    {
        Calculator calculator = new Calculator();

        // Subscribe to the event using the delegate.
        calculator.CalculationPerformed += HandleCalculation;

        int sum = calculator.Add(5, 3); // This will trigger the delegate.

        Console.WriteLine("Sum: " + sum);
    }

    // Define a method that matches the delegate signature.
    public static void HandleCalculation(int result)
    {
        Console.WriteLine("Calculation performed. Result: " + result);
    }
}
```

In this example:

- We define a custom delegate **MyDelegate** that represents methods taking an **int** parameter and returning **void**.
- The **Calculator** class has a **CalculationPerformed** delegate field, which represents an event.
- When the **Add** method is called, it performs the addition and then invokes the **CalculationPerformed** delegate to notify subscribers (event handlers) about the result.
- The **Program** class subscribes to the event by adding a method (**HandleCalculation**) to the delegate. When the calculation is performed, the **HandleCalculation** method gets called.

**Events**:

An event be a special type of delegate that provides more control over how subscribers can add or remove event handlers. Events be used to implement the publisher-subscriber pattern more securely, as they restrict direct access to the delegate.

**Practical Use of Events**:

Here's an example of using events:

```plaintext
public class StockMarket
{
   // Define an event using the EventHandler delegate.
   public event EventHandler<StockChangedEventArgs> StockChanged;
   private decimal currentPrice = 100.00m;
   public void SimulateMarket()
   {
       // Simulate changes in stock price.
       while (true)
       {
           Thread.Sleep(1000);
           decimal newPrice = currentPrice + (decimal)(new Random().NextDouble() * 5 - 2.5);
           StockChangedEventArgs args = new StockChangedEventArgs(newPrice);
           currentPrice = newPrice;
           // Raise the event to notify subscribers.
           StockChanged?.Invoke(this, args);
       }
   }
}
public class StockChangedEventArgs : EventArgs
{
   public decimal NewPrice { get; }
   public StockChangedEventArgs(decimal newPrice)
   {
       NewPrice = newPrice;
   }
}
public class Program
{
   public static void Main()
   {
       StockMarket market = new StockMarket();
       market.StockChanged += HandleStockChange;
       Console.WriteLine("Stock Market Simulation: ");
       market.SimulateMarket();
   }
   public static void HandleStockChange(object sender, StockChangedEventArgs e)
   {
       Console.WriteLine($"Stock price changed to: {e.NewPrice:C}");
   }
}
```

In this example:

- We define an event **StockChanged** using the **EventHandler<TEventArgs>** delegate. This event notifies subscribers when the stock price changes.
- The **StockMarket** class simulates changes in stock prices and raises the **StockChanged** event to notify subscribers.
- The **StockChangedEventArgs** class holds information about the new stock price.
- The **Program** class subscribes to the event by adding the **HandleStockChange** method as an event handler. When the stock price changes, the event handler is called.

Delegates and events be essential in C# for building responsive and decoupled applications. They allow different parts of an application to communicate and respond to events without directly depending on each other, promoting loose coupling and maintainability.


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Original Source: https://www.mindstick.com/forum/159865/explain-the-concept-of-delegates-and-events-in-c-sharp-and-provide-examples-of-their-practical-use

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