#636 – The Reason for Partial Methods

Partial methods allow one portion of a class to declare one or more methods and then another portion of the class, in a different file, to optionally implement one or more of those methods.

You’ll typically see partial methods used when some tool generates a portion of a class and the user (developer) is expected to develop the remainder of the class.  The class in question is a partial class, because it is split across two (or more) files–the tool-generated part and the user-generated part.

Using partial methods, the tool-generated code can declare a number of optional methods that are basically extensibility points for the user-generated code.  The tool-generated will call these methods, but only if the user decides to implement them.  If the user does not implement them, they are simply not called.


About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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