![]() ![]() This error message proves that the inherited class does not know anything about the default method of an interface in C#. Once you do the above changes, you will get a compile-time error CS1061: ‘An圜lass’ does not contain a definition for ‘DefaultMethod’, and no accessible extension method ‘DefaultMethod’ accepting a first argument of type ‘An圜lass’ could be found (are you missing a using directive or an assembly reference?) as shown in the below image Now, Change the IDefaultInterfaceMethod to An圜lass while creating the instance inside the Main method as shown in the below code. DefaultMethod with implementation, and the implementer class in our example is An圜lass which has no idea about this default method. If you look at the above code, you will see that the interface has a method i.e. IDefaultInterfaceMethod an圜lass = new An圜lass() } Example to Understand Default Interface Methods in C# using System Ĭonsole.WriteLine("I am a default method in the interface!") Syntax to provide Default Implementation for Interface Method in C#:Ĭonsole.WriteLine(“I am a default method in the interface!”) Otherwise, it can easily lead to violating the single responsibility principles. override keyword is currently not possible, but this might be changed in C# 9.Instance state, instance fields, instance auto-properties.Explicit access modifiers with default access is public Not allowed in the interface in C#:.Static methods, properties, indexers, and events.Private, protected, internal, public, virtual, abstract, sealed, static, extern.A body for a method or indexer, property, or an event accessor.The main benefit of the Default method is that it allows us to add new functionality to the interfaces of our libraries and ensure the backward compatibility with code written for older versions of those interfaces. Now you are allowed to add a method with their implementation to the interface without breaking the existing implementation of the interface, such type of method is known as default interface methods (also known as the virtual extension methods). Default Interface Methods in C#īefore C# 8.0 interfaces only contain the declaration of the members (methods, properties, events, and indexers), but from C# 8.0 it is allowed to add members as well as their implementation to the interface. Now in C# 8.0, we can add the default method to the interface without breaking the existing implementation. Earlier, one major difference between the abstract class and interface was that we could not add a default method in the interface once it was implemented in child classes. Please read our previous article, where we discussed C# 8 new Feature Readonly Structs in C# with Examples. In this article, I am going to discuss Default Interface Methods in C# with Examples. ConcurrentDictionary Collection Class in C#īack to: C#.NET Tutorials For Beginners and Professionals Default Interface Methods in C# with Examples.Generic LinkedList Collection Class in C#. ![]() Generic SortedDictionary Collection Class in C#.Generic SortedSet Collection Class in C#.Generic SortedList Collection Class in C#.Conversion Between Array List and Dictionary in C#.How to Sort a List of Complex Type in C#.Advantages and Disadvantages of Non-Generic Collection in C#.Advantages and Disadvantages of Arrays in C#.Variable Reference and Instance of a Class in C#.Partial Class and Partial Methods in C#.Multiple Inheritance Realtime Example in C#.Interface Interview Questions and Answers in C#.How to Use Abstract Classes and Methods in C# Application.Abstract Class and Abstract Methods Interview Questions in C#.Abstract Class and Abstract Methods in C#.Generalization and Specialization in C#.How to use Inheritance in Application Development.Static vs Non-Static Constructors in C#.Object Oriented Programming (OOPs) in C#.Data Structures and Algorithms Tutorials. ![]()
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