What is Interface segregation principle and how to implement it in C#?

Clients should not be forced to depend upon interfaces that they don't use.

The Interface Segregation Principle states that clients should not be forced to implement interfaces they don't use.

Instead of one fat interface many small interfaces are preferred based on groups of methods, each one serving one submodule

Before Interface Segregation

Example

public interface IProduct {
   int ID { get; set; }
   double Weight { get; set; }
   int Stock { get; set; }
   int Inseam { get; set; }
   int WaistSize { get; set; }
}
public class Jeans : IProduct {
   public int ID { get; set; }
   public double Weight { get; set; }
   public int Stock { get; set; }
   public int Inseam { get; set; }
   public int WaistSize { get; set; }
}
public class BaseballCap : IProduct {
   public int ID { get; set; }
   public double Weight { get; set; }
   public int Stock { get; set; }
   public int Inseam { get; set; }
   public int WaistSize { get; set; }
   public int HatSize { get; set; }
}

After Interface Segregation

Example

public interface IProduct {
   int ID { get; set; }
   double Weight { get; set; }
   int Stock { get; set; }
}
public interface IPants {
   int Inseam { get; set; }
   int WaistSize { get; set; }
}
public interface IHat {
   int HatSize { get; set; }
}
public class Jeans : IProduct, IPants {
   public int ID { get; set; }
   public double Weight { get; set; }
   public int Stock { get; set; }
   public int Inseam { get; set; }
   public int WaistSize { get; set; }
}
public class BaseballCap : IProduct, IHat {
   public int ID { get; set; }
   public double Weight { get; set; }
   public int Stock { get; set; }
   public int HatSize { get; set; }
}

Nizamuddin Siddiqui

Published on 25-Nov-2020 12:16:41

• Related Questions & Answers
• What is Liskov Substitution principle and how to implement in C#?
• What is dependency inversion principle and how to implement in C#?
• What is proxy design pattern and how to implement it in C#?
• How to implement Single Responsibility Principle using C#?
• How to implement Open Closed principle using C#?
• What is Killer Bees Financial Strategy and How to implement it?
• What is Facade and how to implement in C#?
• How to implement interface in anonymous class in C#?
• What is an interface in C#?
• What is interpolation and how can we implement it in the SciPy Python library?
• What is the user interface and operating system interface?
• What is #if DEBUG and How to use it in C#?
• What is connection pooling in C# and how to achieve it?
• How to implement Flow.Publisher interface in Java 9?
• How to implement dependency injection using Interface-based injection in C#?