How can I add a method to an existing pre-defined class in VS2005 .Net?
I'm working on a large-scale asp.net (vb) project, and I'm wondering if there's a way to add a new method to the Control class.
Inheritance isn't really an option -- if I made ControlEx Inherits Control and added it there, I'd then need to create a WebControlEx, LabelEx, DropDownList, etc to inherit from that.
I tried creating a Partial Public Class Control and adding the method there (well, okay, I added a simple property for testing purposes), but it didn't work -- I'm pretty sure that's just creating a new "Control" class and not even trying to append to the pre-defined one.
I know this is possible in scripting languages like Javascript and Lua, but has anyone had any success with this in .Net?
Inheritance isn't really an option -- if I made ControlEx Inherits Control and added it there, I'd then need to create a WebControlEx, LabelEx, DropDownList, etc to inherit from that.
I tried creating a Partial Public Class Control and adding the method there (well, okay, I added a simple property for testing purposes), but it didn't work -- I'm pretty sure that's just creating a new "Control" class and not even trying to append to the pre-defined one.
I know this is possible in scripting languages like Javascript and Lua, but has anyone had any success with this in .Net?
Partial Public Class Control
Private _test As Integer
Public Property Test() As Integer
Get
Return _test
End Get
Set(ByVal value As Integer)
_test = value
End Set
End Property
End Class
SOLUTION
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ASKER CERTIFIED SOLUTION
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As an alternative to FindControlRecursive you could use this which uses generics:
You can read more about it here
You can read more about it here
public static T FindControl<T>(System.Web.UI.ControlCollection Controls) where T : class
{
T found = default(T);
if (Controls != null && Controls.Count > 0)
{
for (int i = 0; i < Controls.Count; i++)
{
if (Controls[i] is T)
{
found = Controls[i] as T;
break;
}
else
found = FindControl<T>(Controls[i].Controls);
}
}
return found;
}
ASKER
While that's a good example of finding a control that matches a specific type, I'm not sure what it has to do with my question. :-)
The function I wrote matches by ID -- just like Control.FindControl does.
Anyhow, thanks to everyone for your help. It was kind of a "nice-to-have" feature so I'm not going to worry about it any further.
The function I wrote matches by ID -- just like Control.FindControl does.
Anyhow, thanks to everyone for your help. It was kind of a "nice-to-have" feature so I'm not going to worry about it any further.
ASKER
And it can't be static regardless. Specifically, I'm looking to add something akin to a FindControlRecursive method that will recurse through the control hierarchy to find the control with the specified ID. The method is made and implemented for one control type, but I'd like to apply it to the Control class so that all controls can use it.