c# - Mobile Services query exception -

When I use code with generic:

  varCertactable = Mobile service . GetTable & lt; TParent & gt; (); Var testid = Wait for the cacherestrial. Where (PRINT = & gt; P. IND ID == 20) .OolistSync ();   
 Where TParent: iRenity  
  Public Interface Irannati {Ent ID (Receive; Set;}}   
 I get the exception:  
 
 'Mobile service query expression' convert 'is not supported in' Member 'ID .ID'.   
 But If I change the normal to type:  
  var pertrabble = mobile service. GetTable & lt; Category & gt; (); var testid = Wait for the command-line where (print = & Gt; Pr. Ind. ED == 20) .OoliceSync ();   
 Why do I have a general result? And how can I use general?   
 < Div class = "post-text" itemprop = "text"> 
 Know that this is an old question but the answer is to tell you that this general type is also a class.  
  Where T: Class, Marineette