public void TestDelegate()
{
// Instantiating the delegates with the methods.
DContravariant <Control> dControl = SampleControl;
DContravariant <Button> dButton = SampleButton;
// You can assign dControl to dButton
// because the DContravariant delegate is contravariant.
dButton = dControl;
// Invoke the delegate.
dButton(new Button());
}
public void TestVariance()
{
DInvariant <string> dinString = () => "";
//DInvariant<object> dinObject = dinString;
DCovariant <string> dcoString = () => " ";
DCovariant <object> dcoObject = dcoString;
DContravariant <object> dcontraObject = (a) => Console.WriteLine(a);
DContravariant <string> dcontraString = dcontraObject;
DVariant <object, string> dObjectString = (a) => $"{a} ";
DVariant <object, object> dObjectObject = dObjectString;
DVariant <string, string> dStringString = dObjectString;
DVariant <string, object> dStringObject = dObjectString;
}
