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  1. using System;
  2.  
  3. interface A { void Foo(); }
  4. interface B { void Foo(); }
  5. interface C { void Foo(); }
  6.  
  7. class D : A, B, C { 
  8. 	public void Foo() { Console.WriteLine("pub fn"); }  
  9. 	void A.Foo() { Console.WriteLine("spec fun A"); }
  10. 	void B.Foo() { Console.WriteLine("spec fun B"); }
  11. }
  12.  
  13. public class Test
  14. {
  15. 	public static void Main()
  16. 	{
  17. 		var c = new D();
  18. 		c.Foo();
  19.  
  20. 		((A)c).Foo();
  21. 		((B)c).Foo();
  22. 		((C)c).Foo();
  23.  
  24. 		// The call is ambiguous between the following methods or properties: `AExtensions.FooMeTwice(this A)' and `BExtensions.FooMeTwice(this B)'
  25. 		// c.FooMeTwice();
  26.  
  27. 		Console.WriteLine("Using extension:");
  28. 		((A)c).FooMeTwice();
  29. 		((B)c).FooMeTwice();
  30. 	}
  31. }
  32.  
  33. public static class AExtensions
  34. {
  35. 	internal static void FooMeTwice(this A a) {
  36. 		a.Foo();	
  37. 		a.Foo();
  38. 	}
  39. }
  40.  
  41.  
  42. public static class BExtensions
  43. {
  44. 	internal static void FooMeTwice(this B b) {
  45. 		Console.Write("What: ");
  46. 		b.Foo();
  47. 	}
  48. }
  49.  
  50.  
Success #stdin #stdout 0.02s 15708KB
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Standard input is empty
stdout
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pub fn
spec fun A
spec fun B
pub fn
Using extension:
spec fun A
spec fun A
What: spec fun B
https://ideone.com/zW1OSj
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
public

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