I have a custom ASP.NET server control
CustomControl with a property attribute
Path is not explicitly specified, then I want an exception to be thrown.
<myControls:CustomControl Path="somedirectory/someotherdirectory/somefile.ext" runat="server" />
should compile, and
<myControls:CustomControl runat="server" /> should throw an exception.
I realize I can do this in the getter of the
Path property, but is there some attribute that necessitates this?
Is there any mechanism for validating the values of the property attributes other than using in the getter methods of the code-behind properties?
You can check this in init event of the custom control, and throw an exception.
There is; Check it in init event. As init of control's called after host's (page or user control) init event. So you can throw an exception if its null or empty
There is not an attribute that necessitates this. The best place to do this is in the getter of the Path property.
I don't think this should be a compile time check.
After all, the property value might be supplied in the code behind during page_load or a similiar event.
No, there's no way to force the page framework to do this. You need to do it in your code at runtime and raise an exception if the value wasn't provided. Otherwise we'd never run into the "crap, I forgot the runat=server part" error :)