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Single Responsibility Principle In C#

This article describes the Single Responsibility Principle in C#.

Purpose

The Single Responsibility Principle states 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 two responsibilities: -

Insert data into the database.
Logging an error.

To implement the Single Responsibility Principle, we will create an additional class for logging errors. 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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