generic - getType for cast - c# .Net2 aspx

[Steph]

hello,
i want to find the type from a generic... like :
public static john<T>(object obj, T myControl)
{
((myControl.get Type())myContro l).OnClientClic k ="code";
}

because my generic var can be a Button, LinkButton, ... with "OnClientCl ick
" event.
and i dont want use :

public static john(object obj, LinkButton myControl)
{
myControl.OnCli entClick ="code";
}
public static john(object obj, Button myControl)
{
Button.OnClient Click ="code";
}

thx

[Marc Gravell]

Normally, that wouldn't be a generics question, but rather a base-class
/ interface question.

However, in this case the OnClientClick property isn't exposed in a
base-class / interface; one solution here would be reflection;
*however* since there are only 3 classes (Button, ImageButton and
LinkButton) with this property, I would actually recommend the
overloaded form that you have written. It will be a lot faster.

Marc

[Steph]

i code that :

public static bool john<T>(T myControl)
{
switch(myContro l.GetType().Nam e)
{
case "Button":
case "ImageButto n":
case "LinkButton ":
myControl.getTy pe().GetPropert y("OnClientClic k").SetValue(my Control,"code", null);
return true;
}
return false;
}
"Marc Gravell" <ma**********@g mail.coma écrit dans le message de news:
11************* ********@n67g20 00...legro ups.com...

Normally, that wouldn't be a generics question, but rather a base-class
/ interface question.

However, in this case the OnClientClick property isn't exposed in a
base-class / interface; one solution here would be reflection;
*however* since there are only 3 classes (Button, ImageButton and
LinkButton) with this property, I would actually recommend the
overloaded form that you have written. It will be a lot faster.

Marc

[Marc Gravell]

As Dale and myself already observed : you aren't using the generic, so
don't code it as though you are. Generics cannot solve this problem.
Reflection will work, but will be the slowest of the three options.
Overloading will be the fastest, but requires the object to be typed
when calling. If all you know is that it is a control (or object,
even), then Dale's type-testing is your best bet.

Marc

[Steph]

Hi,
"Why not just do this:" : because my "code" section is "hard" and i dont
want repeat it three time :
public static bool createLink<T>(T myControl, string message, string action,
string code)
{
switch (myControl.GetT ype().Name)
{
case "LinkButton ":
case "Button":
case "ImageButto n":
IAction ia = ((IAction)((myC ontrol as
Control).Parent .NamingContaine r));
myControl.GetTy pe().GetPropert y("OnClientClic k").SetValue(my Control,
"if(confirm('"+ message+"')){do cument.getEleme ntById('" + ia._ActionID +
"').value=' " + action + "';document.get ElementById('" + ia._ValueID +
"').value=' " + code + "'; }else return false;", null);
return true;
}
return false;
}

generic, reflection, ..., no importance... i want just no repeat my code...
and i wnt take take the best/good way to do it.

"Dale" <da******@nospa m.nospama écrit dans le message de news:
9E************* *************** **...icrosof t.com...

Why use a generic at all? Why not just do this:

public static john(object obj, control c)
{
if (c is LinkButton)
{
((LinkButton)c) .OnClientClick = "code";
}
else if (c is Button)
{
((Button)c).OnC lientClick = "code";
}
else if (c is ImageButton)
{
((ImageButton)c ).OnClientClick = "code";
}
else
{
throw new ArgumentExcepti on("Only Button, ImageButton, or
LinkButton objects can be passed to the Control parameter of John(object
obj,
Control c).");
}
}

Alternatively, a more fxCop friendly way of doing the if would be:

LinkButton lb;
if ((lb = c as LinkButton) != null)
{
lb.OnClientClic k = "code"
}

..... and so forth.

Dale
--
Dale Preston
MCAD C#
MCSE, MCDBA
"Steph" wrote:

>i code that :

public static bool john<T>(T myControl)
{
switch(myContro l.GetType().Nam e)
{
case "Button":
case "ImageButto n":
case "LinkButton ":

myControl.getT ype().GetProper ty("OnClientCli ck").SetValue(m yControl,"code" ,null);
return true;
}
return false;
}
"Marc Gravell" <ma**********@g mail.coma écrit dans le message de news:
11************* ********@n67g20 00...legro ups.com...

Normally, that wouldn't be a generics question, but rather a base-class
/ interface question.

However, in this case the OnClientClick property isn't exposed in a
base-class / interface; one solution here would be reflection;
*however* since there are only 3 classes (Button, ImageButton and
LinkButton) with this property, I would actually recommend the
overloaded form that you have written. It will be a lot faster.

Marc