static void ValidateNonComWrappers()
{
Console.WriteLine($"Running {nameof(ValidateNonComWrappers)}...");
(WeakReference, IntPtr) GetWeakReference()
{
IntPtr objRaw = WeakReferenceNative.CreateWeakReferencableObject();
var obj = Marshal.GetObjectForIUnknown(objRaw);
return(new WeakReference(obj), objRaw);
}
bool HasTarget(WeakReference wr)
{
return(wr.Target != null);
}
var(weakRef, nativeRef) = GetWeakReference();
GC.Collect();
GC.WaitForPendingFinalizers();
// A weak reference to an RCW wrapping an IWeakReference created throguh the built-in system
// should stay alive even after the RCW dies
Assert.IsFalse(weakRef.IsAlive);
Assert.IsTrue(HasTarget(weakRef));
// Release the last native reference.
Marshal.Release(nativeRef);
GC.Collect();
GC.WaitForPendingFinalizers();
// After all native references die and the RCW is collected, the weak reference should be dead and stay dead.
Assert.IsNull(weakRef.Target);
}
private static IntPtr SetWeakReferenceTarget(WeakReference <WeakReferenceableWrapper> wr, TestComWrappers cw)
{
IntPtr objRaw = WeakReferenceNative.CreateWeakReferencableObject();
var obj = (WeakReferenceableWrapper)cw.GetOrCreateObjectForComInstance(objRaw, CreateObjectFlags.None);
wr.SetTarget(obj);
ValidateWeakReferenceState(wr, expectedIsAlive: true, cw);
return(objRaw);
}
private static (WeakReference <WeakReferenceableWrapper>, IntPtr) GetWeakReference(TestComWrappers cw)
{
IntPtr objRaw = WeakReferenceNative.CreateWeakReferencableObject();
var obj = (WeakReferenceableWrapper)cw.GetOrCreateObjectForComInstance(objRaw, CreateObjectFlags.None);
var wr = new WeakReference <WeakReferenceableWrapper>(obj);
ValidateWeakReferenceState(wr, expectedIsAlive: true, cw);
return(wr, objRaw);
}
static (WeakReference <WeakReferencableWrapper>, IntPtr) GetWeakReference()
{
var cw = new TestComWrappers();
IntPtr objRaw = WeakReferenceNative.CreateWeakReferencableObject();
var obj = (WeakReferencableWrapper)cw.GetOrCreateObjectForComInstance(objRaw, CreateObjectFlags.None);
return(new WeakReference <WeakReferencableWrapper>(obj), objRaw);
}
static (WeakReference <WeakReferencableWrapper>, IntPtr) GetWeakReference()
{
var cw = new TestComWrappers();
IntPtr objRaw = WeakReferenceNative.CreateWeakReferencableObject();
var obj = (WeakReferencableWrapper)cw.GetOrCreateObjectForComInstance(objRaw, CreateObjectFlags.None);
// The returned WeakReferencableWrapper from ComWrappers takes ownership
// of the ref returned from CreateWeakReferencableObject.
// Call Marshal.AddRef to ensure that objRaw owns a reference.
Marshal.AddRef(objRaw);
return(new WeakReference <WeakReferencableWrapper>(obj), objRaw);
}