Do Partial Classes Extend Existing Code 2

[PGO01]

I get the impression that a partial class can extend existing (compiled) code. Is this correct?

I've tried to mock up a simple example but I can't do it.

Here's what I did:

1. I created a simple partial class and compiled it.
2. I created a new console app. and added a reference to my previously created assembly.
3. I created a partial class in my console app. with the same name and same namespace as the previously compiled one.
4. I added a new property.

 

[jmeckley]

My understanding of partial classes is that they work within the assembly. In other words, it does not work with compiled code.

The partial class was created for the main purpose of designer code like webforms and winforms. the auto-generated code goes into one file, and your code goes into another file. At compile time it's the same object. But design time code is separated to ease readability and maintainability.

Design patterns liek Proxy, Decorator, Adapter are the common ways to extend functionality.

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190

 

[chiph]

You can use partial classes like that, but the class you're trying to extend has to already be marked as being a partial.

Extension methods (new to 3.x) are probably what you're looking for.

Chip H.

____________________________________________________________________
www.chipholland.com

 

[jmeckley]

thanks for the correction chiph

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190

 

[PGO01]

Thanks both for your answers.

ChipH I've tried compiling my own partial class and extending it in another assembly, but once compiled I don't think it's recognised as being partial any more...

Extension methods look very interesting though...

 

[jmeckley]

You can also apply some simple programming patterns like the Decorator or Proxy pattern.

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190