C# windows programing

Let me explain you with an example from my code base, we have a logger class and wheeever log method is called we fire our own event named LoggerLogged and in which we pass on object the current object using this keyword and the message in event args like:

publicclassProcessLogger
{
publiceventEventHandlerOnLoggerLogged;
publicvoidWriteLog(stringmessage)
{
//samemessagetosomefileorDB
if(this.OnLoggerLogged!=null)//ifsomeonesubsribeeventthenfire
OnLoggerLogged(this,newLoggerLoggedEventArgs(message));
}
}

and here is our custom LoggerLoggedEventArgs class :

publicclassLoggerLoggedEventArgs:EventArgs
{
publicLoggerLoggedEventArgs(stringmessage)
{
Message=message;
}
publicstringMessage{get;privateset;}
}

and in my windows form we register it :

this.Logger.OnLoggerLogged+=newEventHandler(Logger_OnLoggerLogged);

Now when logger class Log method is called event is fired in our form and we have in first parameter the object which raised the event and eventargs we get the message that was logged and then we display it on form :

voidLogger_OnLoggerLogged(objectsender,CRERadialDemographics.Logging.LoggerLoggedEventArgse)
{
varmessage=e.Message;//nowuseit
}

I hope it helps.

3 Replies

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Krishna Rajput Singh10y ago
https://msdn.microsoft.com/en-us/library/360kwx3z(v=vs.90).aspx
http://www.c-sharpcorner.com/uploadfile/puranindia/windows-programming-using-C-Sharp/
http://csharp.net-informations.com/gui/cs_forms.htm
Ehsan Sajjad10y ago
Let me explain you with an example from my code base, we have a logger class and wheeever log method is called we fire our own event named LoggerLogged and in which we pass on object the current object using this keyword and the message in event args like:
publicclassProcessLogger
{
publiceventEventHandlerOnLoggerLogged;
publicvoidWriteLog(stringmessage)
{
//samemessagetosomefileorDB
if(this.OnLoggerLogged!=null)//ifsomeonesubsribeeventthenfire
OnLoggerLogged(this,newLoggerLoggedEventArgs(message));
}
}
and here is our custom LoggerLoggedEventArgs class :
publicclassLoggerLoggedEventArgs:EventArgs
{
publicLoggerLoggedEventArgs(stringmessage)
{
Message=message;
}
publicstringMessage{get;privateset;}
}
and in my windows form we register it :
this.Logger.OnLoggerLogged+=newEventHandler(Logger_OnLoggerLogged);
Now when logger class Log method is called event is fired in our form and we have in first parameter the object which raised the event and eventargs we get the message that was logged and then we display it on form :
voidLogger_OnLoggerLogged(objectsender,CRERadialDemographics.Logging.LoggerLoggedEventArgse)
{
varmessage=e.Message;//nowuseit
}
I hope it helps.
Ritesh Singh10y ago
The sender is the control that the action is for (say OnClick, it's the button).
The EventArgs are arguments that the implementor of this event may find useful. With OnClick it contains nothing good, but in some events, like say in a GridView 'SelectedIndexChanged', it will contain the new index, or some other useful data.