public void Activator_CreateInstance_Generic()
{
Choice1 c = Activator.CreateInstance <Choice1>();
Assert.AreEqual(1, c.I);
Activator.CreateInstance <DateTime>();
Activator.CreateInstance <StructTypeWithoutReflectionMetadata>();
}
public void Activator_TestActivatorOnNonActivatableFinalizableTypes()
{
// On runtimes where the generic Activator is implemented with special codegen intrinsics, we might allocate
// an uninitialized instance of the object before we realize there's no default constructor to run.
// Make sure this has no observable side effects.
AssertExtensions.ThrowsAny <MissingMemberException>(() => { Activator.CreateInstance <TypeWithPrivateDefaultCtorAndFinalizer>(); });
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Assert.IsFalse(TypeWithPrivateDefaultCtorAndFinalizer.WasCreated);
}
public void Activator_CreateInstance_Generic_Invalid()
{
#if !WindowsCE
AssertExtensions.ThrowsAny <MissingMemberException>(() => Activator.CreateInstance <int[]>()); // Cannot create array type
#else
Activator.CreateInstance <int[]>(); // Can create array type
#endif
AssertExtensions.ThrowsAny <MissingMemberException>(() => Activator.CreateInstance <TypeWithoutDefaultCtor>()); // Type has no default constructor
AssertExtensions.Throws <TargetInvocationException>(() => Activator.CreateInstance <TypeWithDefaultCtorThatThrows>()); // Type has a default constructor that throws
#if !WindowsCE
AssertExtensions.ThrowsAny <MissingMemberException>(() => Activator.CreateInstance <AbstractTypeWithDefaultCtor>()); // Type is abstract
AssertExtensions.ThrowsAny <MissingMemberException>(() => Activator.CreateInstance <IInterfaceType>()); // Type is an interface
#else
AssertExtensions.ThrowsAny <MemberAccessException>(() => Activator.CreateInstance <AbstractTypeWithDefaultCtor>()); // Type is abstract
AssertExtensions.ThrowsAny <MemberAccessException>(() => Activator.CreateInstance <IInterfaceType>()); // Type is an interface
#endif
}
public void Activator_CreateInstance()
{
// Passing null args is equivalent to an empty array of args.
Choice1 c = (Choice1)(Activator.CreateInstance(typeof(Choice1), null));
Assert.AreEqual(1, c.I);
c = (Choice1)(Activator.CreateInstance(typeof(Choice1), new object[] { }));
Assert.AreEqual(1, c.I);
c = (Choice1)(Activator.CreateInstance(typeof(Choice1), new object[] { 42 }));
Assert.AreEqual(2, c.I);
c = (Choice1)(Activator.CreateInstance(typeof(Choice1), new object[] { "Hello" }));
Assert.AreEqual(3, c.I);
c = (Choice1)(Activator.CreateInstance(typeof(Choice1), new object[] { 5.1, "Hello" }));
Assert.AreEqual(4, c.I);
Activator.CreateInstance(typeof(StructTypeWithoutReflectionMetadata));
}