Learning Objective How to create generic interfaces of type T How to implement a generic interface in a non-generic class How to implement a generic interface in a generic class Prerequisites Please review the basic concepts of generics to understand the article better. https://hackernoon.com/how-generics-differ-in-java-and-c?embedable=true https://medium.com/swlh/multiple-generic-constraints-net-1973fbaaf8de?embedable=true Getting Started Let us understand how to create an interface of type T. A blank interface will look like this. public interface ITest<T> { } An interface with one member function definition public interface ITest<T> {
   List<T> GetList();
} The syntax for multiple generic values for an interface public interface ITest<T, U>{
  List<T> GetList(U value);
} After understanding the basic syntax for interfaces with single or numerous generic types. Let's see how to implement them in a class. Implementation in a non-generic class The implementation is divided into two cases: Case 1: Single generic type interface with non-generic class The below example shows if we do not define the “T” type. Please refer definition above. ITest<T> public class Test : ITest<T>{
  public List<T> GetList(){}
} The compiler will throw an exception that it cannot understand the reference of T. Solution: Let’s define the type “T.” public class Test : ITest<int>{
   public List<int> GetList(){return null;}
} Case 2: Multiple generic type interface with non-generic class In the case of non-generic classes, as mentioned above, we must define the genetic types. Please refer definition above. ITest<T,U> public class Test : ITest<int, int>{
   public List<int> GetList(int value){return null;}
} Implementation in a generic class The implementation is again divided into two cases: Case 1: Single generic type interface with a generic class Please refer definition above. ITest<T> public class Test<T> : ITest<T>{
  public List<T> GetList(){return null;}
} Case 2: Multiple generic type interface with a generic class Please refer definition above. ITest<T,U> public class Test<T, U> : ITest<T, U>{
   public List<T> GetList(U value){return null;}
} Thank you for reading, and I hope you liked the article. Please provide your feedback in the comment section. Follow me on , , , , , , , . C# Publication LinkedIn Twitter Dev.to Pinterest Substack Wix HackerNoon Also published . here

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How to Implement a Generic Interface in a Non-generic Class in C#

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