c# - Getting generic value from fieldinfo throws exception: "Late bounds operation cannot be performed..." -

i'm trying instance value of generic type static field inside generic class, , throws exception:

late bound operations cannot performed on fields types type.containsgenericparameters true

public class managertemplate<q, t> : iobjectmanager         t : filmation.runtime.engine.objectid, new( )         q : managertemplate<q, t>, new( ) {          public readonly static q instance = new q( );         <---- static field }   private static void findmanagers( ) {     var iobjectmanagertype = typeof( iobjectmanager );      var managers = iobjectmanagertype.assembly           .gettypes( )           .where( t => !t.isabstract && t.getinterfaces().any( => == iobjectmanagertype) );      foreach (var manager in managers) {          var fi = manager.getfield( "instance" );          var instance = fi.getvalue( null );                  <--- exception     } } 

i have tried use getgenerictypedefinition, continues throwing exception.

i have searched in google, have not found how can done...

anyone knows how can done?

edit: same using static property

this workaround have implemented, (though i'd know if can done using reflection):

public static q instance { get; private set; }  static managertemplate( ) {      instance = new q( );      environment.managers.add( instance ); } 

you cannot value of public readonly static q instance = new q( ); generic type definition managertemplate<q, t>, because there no concrete type q.

how instance of generic type definition q if not yet know concrete type q is? simple: can't.

now... if want instance of type descends managertemplate<q, t> generic type parameter q defined, want exclude generic type parameters search.

private static ienumerable<iobjectmanager> findmanagers() {   type type = typeof(iobjectmanager);   ienumerable<type> managers = type.assembly                    .gettypes()                    .where(t => !t.isabstract && t.getinterfaces().contains(type));    foreach (type manager in managers)   {     var fi = manager.getfield("instance", bindingflags.public | bindingflags.static | bindingflags.flattenhierarchy);     if (fi != null &&         !fi.fieldtype.isgenericparameter &&          type.isassignablefrom(fi.fieldtype))     {       yield return (iobjectmanager) fi.getvalue(null);     }   } } 

this "managers" defined in classes descend managertemplate<q, t> have defined type q is.