Events:Add and Remove Functions : delegate Event « Language Basics « C# / C Sharp

1. C# / C Sharp
2. Language Basics
3. delegate Event

Events:Add and Remove Functions

using System;

public class AddandRemoveFunctions {
    static public void ButtonHandler(object sender, EventArgs e)
    {
        Console.WriteLine("Button clicked");
    }
    
    public static void Main()
    {
        Button button = new Button();
        
        button.AddClick(new Button.ClickHandler(ButtonHandler));
        
        button.SimulateClick();
        
        button.RemoveClick(new Button.ClickHandler(ButtonHandler));
    }
}
public class Button
{
    public delegate void ClickHandler(object sender, EventArgs e);
    private ClickHandler click;
    
    public void AddClick(ClickHandler clickHandler)
    {
        click += clickHandler;
    }
    
    public void RemoveClick(ClickHandler clickHandler)
    {
        click -= clickHandler;
    }
    
    protected void OnClick()
    {
        if (click != null)
        click(this, null);
        
    }
    
    public void SimulateClick()
    {
        OnClick();
    }
}

           
       

Related examples in the same category

1.	A very simple event demonstration
2.	An event multicast demonstration
3.	Individual objects receive notifications when instance event handlers are used
4.	A class receives the notification when a static method is used as an event handler
5.	Create a custom means of managing the event invocation list
6.	Use the bult-in EventHandler delegate
7.	Use delegate: event
8.	Delegate and event hierarchy
9.	Events:Add and Remove Functions 2
10.	Events: Custom Add and Remove
11.	Delegates And Events
12.	Delegates And Events 2
13.	Chaining events.