Firing event when instance created

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1.00/5 (2 votes)

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C#

How to Firing event when instance created? in C#

Posted 23-Jan-13 6:03am

Mir Hassan Moosavi

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Comments

Kishor Deshpande 23-Jan-13 12:08pm

You want to raise event on which instance creation?
Please share atleast some description.

Mir Hassan Moosavi 24-Jan-13 4:23am

my problem image is here:

http://www.freeimagehosting.net/1msij

joshrduncan2012 23-Jan-13 12:08pm

What IDE? What is the context of how you are wanting to do this? Please improve question and add more info as to what you are referring to.

Mir Hassan Moosavi 24-Jan-13 4:24am

my problem image is here:

http://www.freeimagehosting.net/1msij

Sergey Alexandrovich Kryukov 23-Jan-13 12:30pm

Instance of what?!
—SA

Jibesh 23-Jan-13 17:52pm

Probably an interview question ;)

Mir Hassan Moosavi 24-Jan-13 4:24am

my problem image is here:

http://www.freeimagehosting.net/1msij

Sergey Alexandrovich Kryukov 24-Jan-13 12:39pm

What an odd request!
—SA

Mir Hassan Moosavi 24-Jan-13 2:41am

I firing event when instance of my class Created in C#,(in VS10)-

2 solutions

Solution 1

What an odd request! You can't do it with "normal" events, because you can't hook a handler to them until the instance constructor is finished (there is no instance to hook the handler to until then!)
You can do it, but it needs to be a Static Event:

C#

public class XX
    {
    public static event EventHandler Created;
    public string Text { get; set; }
    public XX(string n)
        {
        Text = n;
        if (Created != null)
            {
            Created(this, null);
            }
        }
    }

You can then hook to it and so forth:

C#

XX.Created += new EventHandler(XX_Created);
...
XX x = new XX("ONE");
XX y = new XX("Two");

It's a strange request though.

Posted 23-Jan-13 6:17am

OriginalGriff

Comments

BC @ CV 23-Jan-13 15:54pm

Why is this voted a 1? This is good code that answers the question. +5

Jibesh 23-Jan-13 17:53pm

Nice answer +5

Mir Hassan Moosavi 24-Jan-13 2:44am

This is not work..What's XX_Created ?!

OriginalGriff 24-Jan-13 3:33am

An event handler method name.
Since I don't know what you want to do, there is not a lot of point in my creating a handler method...

Mir Hassan Moosavi 24-Jan-13 3:01am

XX.Created += new EventHandler(XX_Created);

Where Set this?!?!? - In Constructor Or other Places ?

OriginalGriff 24-Jan-13 3:32am

Up to you - probably, you need it fairly early in your program if you are to detect instance creation: it depends on what you are trying to monitor.

Mir Hassan Moosavi 24-Jan-13 3:48am

I want to when my Instance Created Event firing and for example changing Inner Property value and Say me ..hey "I am your Instance!. My Property Changed"

Mir Hassan Moosavi 24-Jan-13 3:55am

Realy tanX..But ForExample.I want:

static void Main(string[] args){

XX x = new XX(); // This is Only Code Line in Main Method
}
==> in Console Output write ==> x Instance Created (x From XX Class) .

OriginalGriff 24-Jan-13 4:26am

Then you have to add the event handler as the first instruction in Main.
Until you have added the handler, nothing will happen (as the event does not have anything to call)
You can't get the name of the variable it is being assigned into, as (for one thing) that hasn't happened until after the constructor is complete.

Mir Hassan Moosavi 24-Jan-13 4:22am

my problem image is here:

http://www.freeimagehosting.net/1msij

Mir Hassan Moosavi 24-Jan-13 3:12am

How to implement this in Real..i', confused :(

Mir Hassan Moosavi 24-Jan-13 4:21am

my problem image is here:

http://www.freeimagehosting.net/1msij

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Mir Hassan Moosavi · Accepted Answer · 2013-01-25T01:30:00

namespace byMirHassanMoosavi /*This ProblemSet is very Easy!!*/
{
#region UsingScope
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
#endregion

#region ProblemSet
namespace evtFiring
{
#region SolutionScope
public delegate void OnCreateEvent(); //delegate declaration

[Serializable()]
public class Person
{
public static event OnCreateEvent CreateEvent; //static event declaration (delegate in use!)

#region Props & Field
public string Name { get; set; }
public string Family { get; set; }
public string SerializableStatus = string.Empty;
#endregion

#region Constructor
public Person() //default Constructor & event firing place
{
this.Name = "unknown-name!";
this.Family = "unknown-family!";
//Using Lambda Expression for declare an anonymous method
Person.CreateEvent += new OnCreateEvent(() =>
{
#region ChangeConsoleTheme
Console.BackgroundColor = ConsoleColor.DarkGreen;
Console.Clear();
Console.ForegroundColor = ConsoleColor.Green;
#endregion

if (this.GetType().IsSerializable == true)
this.SerializableStatus = "is";
else SerializableStatus = "is not";

Console.WriteLine(
"\r\nThe Instance of Person Class Created in - {0} - with \r\nFollowing Information|>\r\n\r\n\t|> Name: {1}\t\r\n\t|> Family: {2}\t\r\n\r\n\t|> {1} {2} HashCode Is: {3}\t\r\n\t|> {1} {2} Type Is: {4}\t\r\n\t\r\n\t|> {1} {2} {5} Serializable.\r\n",
DateTime.Now.ToString(),
this.Name, this.Family,
this.GetHashCode().ToString(), this.GetType().Name, SerializableStatus);
});
//First Check then fire!!
if (CreateEvent != null)
{
CreateEvent();
}
}
public Person(string name, string family)//Main Constructor
{
this.Name = name;
this.Family = family;
//Using Lambda Expression for declare an anonymous method
Person.CreateEvent += new OnCreateEvent(() =>
{
#region ChangeConsoleTheme
Console.BackgroundColor = ConsoleColor.DarkGreen;
Console.Clear();
Console.ForegroundColor = ConsoleColor.Green;
#endregion

if (this.GetType().IsSerializable == true)
this.SerializableStatus = "is";
else SerializableStatus = "is not";

Console.WriteLine(
"\r\nThe Instance of Person Class Created in - {0} - with \r\nFollowing Information|>\r\n\r\n\t|> Name: {1}\t\r\n\t|> Family: {2}\t\r\n\r\n\t|> {1} {2} HashCode Is: {3}\t\r\n\t|> {1} {2} Type Is: {4}\t\r\n\t\r\n\t|> {1} {2} {5} Serializable.\r\n",
DateTime.Now.ToString(),
this.Name, this.Family,
this.GetHashCode().ToString(), this.GetType().Name, SerializableStatus);
});
//First Check then fire!!
if (CreateEvent != null)
{
CreateEvent();
}
}
#endregion
}
#endregion

#region Using'Solution'
class Program
{
static void Main(string[] args)
{
Person p = new Person("MirHassan", "Moosavi");

Console.WriteLine("------------------------------------------------------------------------");

//Person p2 = new Person();

Console.ReadKey();

}
}
#endregion
}
#endregion
}

Firing event when instance created

2 solutions

Solution 1

Solution 2

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