To/From Code

	Languages
BROWSEBYLANGUAGE Access VBA ASP Classic C# C++ C++/CLI Corel Paradox Delphi Delphi Prism Java JavaScript Perl PHP VB Classic VB.Net

	Categories
BROWSEBYCATEGORY +Tool Basics +Language Basics +Language Details +Data Structures +Statements +Operators +Commands +Database +OOP Basics -OOP Details Abstraction Class Helper Code Contract Constructor Destructor Inheritance-Multiple Interface Overriding Partial Class◄╣ Polymorphism Prevent Derivation Static Member

	Members-Only
Sign in to see member-only pages.

► KB ► To/From Guides ► OOP Details

Print This

Partial Class (Cross Ref > OOP Details)

Partial Class

A partial class, or partial type, is a class that can be split into two or more source code files and/or two or more locations within the same source file. Each partial class is known as a class part or just a part. Logically, partial classes do not make any difference to the compiler. The compiler puts the class together at compile time and treats the final class or type as a single entity exactly the same as if all the source code was in a single location.

Languages Focus

For languages that have implemented partial classes, you need to know usage details and restrictions. Can you split a class into two or more files? Can you split a class within a source code file into two or more locations? What are the details of inheritance? Does it apply to interfaces as well?

Access VBA: "Partial Classes" Not Supported

ASP Classic: "Partial Classes" Not Supported

C#: "Partial Classes" partial

C# uses the keyword partial to specify a partial class. All parts must be in the same namespace.

Syntax Example:

class partial Cyborg: System.Object

C# Partial Classes (partial) 3 certification questions.

C++: "Partial Classes" Not Supported

In C++, you can split the implementation of a class among two or more source files. However, you must declare the member in the class declaration.

C++/CLI: "Partial Classes" Not Supported

C++/CLI does not yet support partial classes. My assumption is that it will soon because it is a .Net language�but only time will tell.

Corel Paradox: "Partial Classes" Not Supported

Delphi: "Partial Classes" Not Supported

As of Delphi 2009, partial classes are not supported. The main reason given in the thread below was that the Delphi compiler is a single pass compiler. Here is a link to a discussion thread on the subject:

Delphi language (partial classes)

Delphi Prism: "Partial Classes" partial

Prism supports both partial classes and partial methods using the keyword partial. A partial method is an empty method defined in a partial class.

Syntax Example:

//Organize a large class in multiple files.

T800 = partial class(Cyborg, IHuman);
end;

T800 = partial class(ITalk);
end;

//Partial methods too:�

T800 = public partial class
private
  method Walk; partial; empty;
  method Run; partial; empty;
end;

Delphi Prism Partial Classes (partial)

Java: "Partial Classes" Not Supported

VB Classic: "Partial Classes" Not Supported

VB.Net: "Partial Classes" Partial

VB.Net supports both partial classes and partial methods.

Syntax Example:

Partial Public Class Cyborg
  Inherits System.Object

End Class

VB.Net Partial Classes (Partial)