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Single Responsibility Principle in C#

In this article, we will discuss the Single Responsibility Principle.

Purpose

According to this principle, each class should have only one responsibility.

Example

Consider the following code.

public class Employee {
  public int Id {
    get;
    set;
  }
  public string Name {
    get;
    set;
  }
}

public class EmployeeManagement {
  public void AddEmployee() {}
  public void UpdateEmployee() {}
  public void RemoveEmployee() {}
  public IEnumerable < Employee > GetAllEmployee() {

  }
  public Employee GetEmployeeById(int Id) {

  }
}

The responsibility of the "EmployeeManagement" class is to perform CRUD operation on the Employee entity. So, the class has only one responsibility.

If a new function is added in the class to manage the previous job details of an employee. So, the above class is modified to.

public class Employee {
  public int Id {
    get;
    set;
  }
  public string Name {
    get;
    set;
  }
}

public class EmployeeManagement {
  public void AddEmployee() {}
  public void UpdateEmployee() {}
  public void RemoveEmployee() {}
  public IEnumerable < Employee > GetAllEmployee() {

  }
  public Employee GetEmployeeById(int Id) {

  }

  public void ManagePreviousJobDetails() {}
}

Now, the class has 2 responsibilities

1. Manage the employee details

2. Manage the employee previous employment details.

As per the Single Responsibility Principle, the above class should be segregated to 2 classes. So, the code would be

public class Employee {
  public int Id {
    get;
    set;
  }
  public string Name {
    get;
    set;
  }
}

public class EmployeeManagement {
  public void AddEmployee() {}
  public void UpdateEmployee() {}
  public void RemoveEmployee() {}
  public IEnumerable < Employee > GetAllEmployee() {

  }
  public Employee GetEmployeeById(int Id) {

  }
}

public class EmployeeJobDetails {
  public void ManagePreviousJobDetails() {}
}

Posted By -	Karan Gupta

Posted On -	Monday, December 28, 2020

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