c# - Extension method to check if an object is sub class of T -

I am trying to write an extension method which is a sub class of an object t.

This has not been accepted by Visual Studio, but it has not been accepted.

  Public Static Bull eSilff & Lt; T & G; (This object is OBJ) {Return (type (oBJ). ISBNs (typef (t)); } [Test ()] Public Zero IschildOfTest () {var dog = new dog (); Var isnimal = dog.IsChildOf & lt; Animals & gt; (); Assert.That (isAnimal); }   
 Any ideas how can I write it?   
 
 
 You can just use    but note That is,  is  as it is like  IsSubclassOf . See Jep's fantastic comment for details and I also have an example.  
 On the one side note, I do not think Java allows equivalent  instanceof  in such a general case for some reason, but it's OK in C # .:  
  Public Static Bull Eshilpf & Lt; T & gt; (This object obg) {return is oz t; }   
 Then it makes this so insignificant that readers are more confused to use an extension method than  is  if you used it directly Your test then appears:  
  [test ()] Public Zero Ishichoffast () {var dog = new dog (); Var is Animal = Dog Animals; Assert.That (isAnimal); }   
 An example of one of the differences between   and  IsSubclassOf :  
  [test ]] Public Zero IschildOfTest () {var dog = new dog (); Assert.False (dog.GetType () IsSubclassOf (typeof (dog)).); Responsibility Truth (dog is dog); }