Default implementation in interface is not seen by the compiler?

by

Methods are only available on the interface, not the class. So you can do this instead:

IJsonAble request = new SumRequest()
var result = request.ToJson();

Or:

((IJsonAble)new SumRequest()).ToJson();

The reason for this is it allows you to add to the interface without worrying about the downstream consequences. For example, the ToJson method may already exist in the SumRequest class, which would you expect to be called?

More Related Contents:

  1. Default Interface Methods. What is deep meaningful difference now, between abstract class and interface?
  2. Can a C# class call an interface’s default interface method from its own implementation?
  3. Calling C# interface default method from implementing class
  4. When should we use default interface method in C#?
  5. Does C# 8 support the .NET Framework?
  6. What does null! statement mean?
  7. Nullable reference types with generic return type
  8. Why does Visual Studio Type a Newly Minted Array as Nullable?
  9. Nullable reference types: How to specify “T?” type without constraining to class or struct
  10. How to enable Nullable Reference Types feature of C# 8.0 for the whole project
  11. What are Range and Index types in C# 8?
  12. Factory for IAsyncEnumerable or IAsyncEnumerator
  13. C# 8 switch expression with multiple cases with same result
  14. Meaning of curly braces after the “is” operator
  15. What is the difference between using and await using? And how can I decide which one to use?
  16. How can I use C# 8 with Visual Studio 2017?
  17. How would you implement a “trait” design-pattern in C#?
  18. C#’s can’t make `notnull` type nullable
  19. The annotation for nullable reference types should only be used in code within a ‘#nullable’ context
  20. What does exclamation mark mean before invoking a method in C# 8.0? [duplicate]
  21. Why do we get possible dereference null reference warning, when null reference does not seem to be possible?
  22. .net core 3 yields different floating point results from version 2.2
  23. How to implement an efficient WhenEach that streams an IAsyncEnumerable of task results?
  24. Convert DateTime to Date string “dd/mm/yyyy”
  25. Open file with associated application
  26. GetProperties() to return all properties for an interface inheritance hierarchy
  27. Is it necessary to explicitly remove event handlers in C#
  28. Wait for a void async method
  29. Error: “The node to be inserted is from a different document context”
  30. Does the System.Windows.Forms.Timer run on a different thread than the UI?

Leave a Comment