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Single Responsibility Principle In C#

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

Purpose

The Single Responsibility Principle says that each class should have only one responsibility.

Example

Consider the following class: -

public class Database
{
        public int InsertData(string query)
        {
            try
            {
                //  LOGIC TO INSERT DATA
            }
            catch (Exception ex)
            {
                File.AppendAllText(@"c:\log\error.txt", ex.Message);
            }

            return 1;
        }
}

The above class has 2 responsibilities: -

Insert data into the database
Logging an error

To implement the Single Responsibility Principle, we will create one more class for logging an error. So, the above code is changed to: -

public class Database
 {
        public int InsertData(string query)
        {
            try
            {
                //  LOGIC TO INSERT DATA
            }
            catch (Exception ex)
            {
                var logger = new FileLogger();
                logger.LogError(ex.Message);
            }

            return 1;
        }
}

public class FileLogger
{
        public void LogError(string error)
        {
            File.AppendAllText(@"c:\log\error.txt", error);
        }
}

In the above code, each class has a single responsibility.

Posted By -	Karan Gupta

Posted On -	Monday, December 28, 2020

Updated On -	Tuesday, August 16, 2022

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