Partial Class In C#

Introduction

 

A partial class is a single class that can be split into two (or) more files. That's how multiple programmers can work on the same class using different files. Each part of a partial class should be in the same namespace. You need to use the partial keyword in each part of the partial class. I have written this article focusing on students and beginners.

 

Flow Chart :

Fig: 1

 

Simple Keyword:

 

Partial class is a single class  that can be split into two or more files.

How we can create a project and partial class

 

Step 1

1. “Start” then ”All programs”, Select “ Microsoft Visual Studio”
2. “File” then ”New” , Select Project (or) Ctrl+Shift+N
3. After Clicking the Following Windows appears.

Fig: 2

 

Step 2

1. Right click on solution Explorer then“Add”, select “class”
2. It will show the Window given below in Fig 3.
3. Create a class named as Myclass (or choose the name of your wish)
4. It will show a window as given below in Fig 4

Fig: 3

 

Fig: 4

 

Step 4 

1. Create a partial class using the partial Keyword.
2. Create two different methods in the same class name.
3. Create a Method, then call the class named as testclass, and implement the methods.

Fig: 5

 

Step 5 - Finding the Error

1. The same method name declared in the partial class shows an error message.
2. It will show in the screenshot as shown below.

Fig: 6

 

Coding

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Threading.Tasks;

namespace Partial.Classes
{
   public partial class Myclass
   {
        public int Add (int x,int y)
        {
            return (x + y);
        }

   }
   Public partial class Myclass
   {
        Public int Sub (int x, int y)
        {
            return (x - y);
        }
   }
   public class Testclass
   {
        public void Test()
        {
            Myclass Omyclass = new Myclass();
            Omyclass.Add(10, 20);
            Omyclass.Sub(25, 5);
        }
   }
}

Summary

 

 In this article, I discussed the partial class in C#. I have written this article focusing on beginners and students.