Solved

What are PARTIAL CLASSES and what are the scenarios I should be using them?

Posted on 2014-01-29
2
227 Views
Last Modified: 2014-01-30
Can anyone please explain me what PARTIAL CLASSSES are?
In what scenarios we can use and when should we use them?
0
Comment
Question by:RajG1978
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 36

Assisted Solution

by:Miguel Oz
Miguel Oz earned 250 total points
ID: 39819666
Partial classes span the implemention over multiple files.
It can be used for:
Separate generated  code from your working code. E,g. Winforms, add functionality to web service imported classes.
Separate commonly-edited code from rarely-edited code. E.g. You have some code that does not change at all but you want to provide more functionality with your class.
In other words you can grow a class without using inheritance.
For further info check:
http://www.dotnetperls.com/partial
0
 
LVL 40

Accepted Solution

by:
Jacques Bourgeois (James Burger) earned 250 total points
ID: 39819968
Partial classes are classes whose code is distributed over more than one file.

Windows Forms used if for instance to separate the code written by the programmer and the code generated by the Forms Designer. When you design a form, the code generated ends up in a Partial Class FormName located in a FormName.designer.vb (or .cs in C#), while the code written by the programmer to react to events and makes the form work is also define in a Partial Class FormName contained in a second FormName.vb file. When you compile, the compiler treats the code in the 2 files / 2 partial classes as a single class.

Although it is not used often for other uses, one could thing for instance of a Photo class that is reused across many applications. Some applications use that class in relation with a database that gives information about the photos. Other applications do not care about the database and deal only with the data that comes straight from photo files on the hard disk.

One could like to split that class into 2 partial classes. The first partial contains the general code to work with photos, while the second one contains only the constructors, methods and properties that deal with the database aspect.

In projects that need to work with the database, you include the 2 files. In projects that do not need the database, you include only the main file. That way, you do not carry in the application the database code that would be useless.
0

Featured Post

[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…

626 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question