Introduction
A Partial class is one that can be split among multiple
physical files. This feature was introduced with the release of C#
version 2.0. With C#, we can split the source code for a class into
separate files so that we can organize the definition of a large class into
smaller, easier to manage pieces. When we split a class across multiple files,
we define the parts of the class by using the partial keyword in each file.
Each file contains a section of the class definition, and all parts are
combined when the application is compiled. Look at the example below:
Original and Single Class File (Calculation.cs)
class ClassRoom
{
private int
boycount; //field
public ClassRoom()
//default constructor
{
boycount = 30;
}
public ClassRoom(int
bcount) //overloaded
constructor
{
boycount = bcount;
}
public double
Avg() //method
{
//statements goes here
}
}
Splitted Class Files into two parts
//Calculation1.cs
partial class ClassRoom
{
private int
boycount; //field
public ClassRoom()
//default constructor
{
boycount = 30;
}
}
//Calculation2.cs
partial class ClassRoom
{
public ClassRoom(int
bcount) //overloaded
constructor
{
boycount = bcount;
}
public double
Avg() //method
{
//statements goes here
}
}
Now, when we compile a class
that has been split into separate files, we must provide all the files to the
compiler.
Partial Classes Rules and
Advantages
To work on large projects,
spreading a class over separate files allows multiple programmers to work on it
simultaneously.
When working with automatically generated
source, code can be added to the class without having to recreate the source
file.
To split a class definition, use
the partial keyword modifier.
All the parts must have the same
accessibility, such as public, private, and so on.
The partial modifier can only
appear immediately before the keywords class, struct, or interface.
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