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Open Close Principle In C#

In this article, we will discuss the open-close principle in C#.

What Does The Open-Close Principle Say?

The open-close principle says that classes are open to extension but closed for modification.

Open-Close Principle In C#

In C#, the open-close principle is implemented using inheritance i.e., using an interface or an abstract class.

Example

Consider the following code: -

public class DBOperations
{
    public void Delete()
    { }
 
    public void Upsert(object entity)
    { }
 
    public List<object> GetAll()
    {
        return new List<object>();
    }
}

In the above code, the class "DBOperations" is an existing class that contains the methods to perform CRUD operations. Let us assume that the client has given a new requirement to add a new method to execute the stored procedures.

As per the open-close principle, the class "DBOperations" should not be changed. A new class should be created that should extend the "DBOperations" class.

So, the code would be: -

public class DBOperations
{
    public void Delete()
    { }
 
    public void Upsert(object entity)
    { }
 
    public List<object> GetAll()
    {
        return new List<object>();
    }
}

public class DBOperationsExt : DBOperations
{
    public void ExecuteStoredProcedure(string storedProcName, ....)
    { }
}

Posted By -	Karan Gupta

Posted On -	Monday, December 28, 2020

Updated On -	Monday, August 22, 2022

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