c# - Fun with generics: no implicit reference conversion error -


I tested this code and found that it is not compiled. 

  Interface IE

Even if I public static zero F & lt; TU & gt; () Where TU: A & lt; Int & gt;, IE & lt; T & gt;

afaik is valid according to C # specs, if I where TU: IE & lt; T & gt; , but in this situation it can not be affected, because A int> Sub-type is IE < T & gt; .

And this is also strange because the Rechargeer IE & lt; T & gt; Interface to A Enter image details here

Why is this code not valid?

No, it not is valid 

 < Code> where TU: IE & lt; T & gt;

current T , that is the way you are calling this method.

Call: 

  A & lt; String & gt; Fu ();   
 For this  TU  as a type of argument,  a & lt; Int & gt;  is trying to pass, but the constraint means that there should be a reference  TU  to  IE , because  T  is  string . 
 
  A & lt; Int & gt;  to  IE , so it is broken. Basically you are expecting " A    IE        
 
 
 You can now convert it to: 
 
  public static zero F & TTU, TT> () where TU: IE & lt; TT & gt; {} static zero Foo () {F>  int>, int> ();}  
 
  He  is now valid because it does not include  T  at all.

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