public void ObjectCasts()
{
// public class ClassA { }
// public class ClassTA : ClassT<ClassA> { }
{
var a = new ClassT <ClassA>();
var b = new ClassTA(); // ClassT<ClassBA>;
a = b;
}
{
var a = new ClassT <ClassA>();
var b = new ClassTA(); // ClassT<ClassBA>;
WriteLine($"a {a.GetType().Name}");
WriteLine($"b {b.GetType().Name}");
{
a = b;
}
{
// b = (ClassTA)a; // InvalidCastException during run
object o = a;
Convert.ChangeType(o, typeof(ClassTA));
var x = (ClassTA)o; // InvalidCastException during run
WriteLine($"o {o.GetType().Name}");
WriteLine($"x {x.GetType().Name}");
}
}
}
public void Casts()
{
var VT = new ClassT();
var VTA = new ClassTA();
var VTBA = new ClassTBA();
var VTCA = new ClassTCA();
var VTDBA = new ClassTCA();
VT = VTA;
VT = VTBA;
VT = VTCA;
VT = VTDBA;
//VTA = (ClassTA) VT; // InvalidCastException during run
// VTA = (ClassTA) VTBA; // Does not compile
// VTA = (ClassTA) VTCA; // Does not compile
// VTA = (ClassTA) VTDBA; // Does not compile
// VTBA = (ClassTBA) VT; // InvalidCastException during run
// VTBA = (ClassTBA) VTA; // Does not compile
// VTBA = (ClassTBA) VTCA; // Does not compile
// VTBA = (ClassTBA) VTDBA; // Does not compile
// VTCA = (ClassTCA)VT; // Does not compile
// VTCA = (ClassTCA)VTA; // Does not compile
// VTCA = (ClassTCA)VTBA; // Does not compile
VTCA = VTDBA;
// VTDBA = (ClassTDBA)VT; // Does not compile
// VTDBA = (ClassTDBA)VTA; // Does not compile
// VTDBA = (ClassTDBA)VTBA; // Does not compile
// VTDBA = (ClassTDBA)VTCA; // Does not compile
// public class ClassTA : ClassT<ClassA> { }
var a = new ClassT <ClassA>();
var b = new ClassTA(); // ClassT<ClassA>;
a = b;
}
