Can't use ternary operator to assign Linq expression

Question

I just typed the following code:

Expression> expression = 
                fileTypeGroupID.HasValue ? n => n.Document.         


        

Answer 1

This doesn't answer you question of why the compiler could not infer the type, but an easy work around would be to write your expression this way:

Expression> expression = 
  n => !fileTypeGroupID.HasValue || n.Document.MimeType.FileTypeGroupID == fileTypeGroupID.Value;