c# - Why it is better to check type of T in generic class in static constructor instead of in non-static? -

my consideration why prefer doing in static constructor called once if given type incorrect in calls, not once , excpect exceptions in parts of code wrong type used.

this example of mean:

internal sealed class generictypethatrequiresanenum<t> {     static generictypethatrequiresanenum() {         if (!typeof(t).isenum) {         throw new argumentexception("t must enumerated type");         }     } } 

why not non-static constructor?

because cannot use particular type @ if static constructor fails. so, there no point check type argument everywhere.

 public class test<t>     {         static test()         {             throw new invalidoperationexception();         }     } 

usage:

new test<string>(); //throws typeinitializationexception