Partial Class in c# for efficient team work

Learn the use of partial class in C# bigger complex project.
Partial Class in c# for efficient team work


We'll discuss on Partial Class in c#, which is a a distinctive element of C#. It can crack the functionality of an individual class into multiple files.

Reassembling partial classes

But at the end, when the application will be compiled, these separated files will be reassembled into one class file.  Each source file includes the definition and declaration of the reassembled methods at the time of compilation. We can split classes, interfaces, structures, and other methods utilizing the different source files.

Partial classes enable us to divide the specific methods into multiple source(.cs) files. All the partial classes get combined again, when the entire program is compiled.

Crucial Utility of Partial Classes

Following are the situations where splitting the files is mandatory:

  1. If you are coding on a bigger size C# project, it's definitely valuable to split the design code ui over various classes by applying easily readable and understandable business logic code which enables developers work on the same project smoothly.
  2. If you are coding on a source that is generated automatically, then the generate code can be added to the class without regenerating the source file.
  3. The visual studio that develops windows forms, web service service code, and some other files, utilizes this partial class strategy to divide it into files without changing them .

Partial classes would be beneficial if you are utilizing source generators to produce  extra functionality.

We can also, split the class definition through the partial keyword modifier.

Role of partial keyword

The partial keyword is utilized to construct a partial class. Also, it denotes that other portions of class, function and method can be formulated here.

Benefits of a Partial Class

  1. The Partial classes play a significant role in separation of business logic code and UI design code
    For example: If we create a web application through the visual studio, some source files get included and these files get partial keywords.
  2. It is not mandatory to reproduce the source file at the time of working with the files that are generated automatically.
  3. Multiple developers will be able to work simultaneously on a single project through different partial classes.
  4. Maintaining, understanding, and developing a partial class is much easier than a huge class for the entire program. A large file can be divided into multiple partial classes carrying different methods.

Important Points to keep in mind.

a) When you need to split the functionality of the class, interface, method, or structure into two or more files, then you need to utilize partial keyword and all the files are necessary to be usable at compile time for assembling the final or main file.

b) The partial editor can be only available instantly prior to the keywords like struct, interface, and class.

c) Each portion of the C# partial class description need to be in that same assembly and

namespace, but another source file name can be given .

d) Each portion of the C# partial class description need to have the similar accessibility as protected, private, etc.

e) If any portion of the partial class is defined as an abstract, base, or sealed, then the entire class is defined as the similar type.

f) The user is also permitted to utilize the nested partial class types.

g) Different parts might have different base types, but the final class type must inherit all the types of base.

Sample partial class C# Project :

Here, we will have a class named German and divide the definition of TC class into two files named TC1.cs, and TC2.cs as given below:

In TC1.cs, and TC2.cs, a partial class is made through the partial keyword and each file included different functionality of TC class as shown above.

When we compile the above code, the compiler assembles TC1.cs and TC2.cs into a single final file, i.e. TC.cs as given below.

TC.cs class may possess the Main Method. For clarity, Main() method is not present here. 

TC.cs Finally


In sum, we have understood that with the use of partial classes, the classes of a single C# project can be split into multiple files. Whenever the project has a large class definition or the project model is complex, the partial class tactic is much more helpful.


Anjan kant

Outstanding journey in Microsoft Technologies (ASP.Net, C#, SQL Programming, WPF, Silverlight, WCF etc.), client side technologies AngularJS, KnockoutJS, Javascript, Ajax Calls, Json and Hybrid apps etc. I love to devote free time in writing, blogging, social networking and adventurous life

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