Cannot marshal 'parameter #2': Invalid managed/unmanaged type combination (Interfaces must be paired with Interface)

[shane-vorwerk]

Using the following code I seem to be running into a problem with the call to GetPropertyStore:

I get the error Invalid managed/unmanaged type combination (Interfaces must be paired with Interface). Either I am declaring the ICreateObject incorrectly or there is a bug in GetPropertyStore which is causing the exception to be thrown.

What is the best way to correct this?

[dahall]

You found a bug in the declaration of IPropertyStoreFactory.GetPropertyStore, which I have now corrected. Thank you.

First question: Have you seen the wrapper classes in Vanara.Windows.Shell.Common? They make working with shell items and properties much simpler.

Second question: Are you aware of the overloaded methods that can make your code a little simpler?

var propertyStoreFactoryForChild = pFolder.BindToObject<IPropertyStoreFactory>(item)!;
propertyStoreFactoryForChild!.GetPropertyStore(GETPROPERTYSTOREFLAGS.GPS_DEFAULT, null, typeof(IPropertyStore).GUID, out var propertyStoreForChild);

[shane-vorwerk]

Hi, thanks for fixing this. I am translating some C++ code so I am keeping the C# as close as possible to that so I can make sure it is correctly translated.

Thanks also for pointing out the overloaded methods, I was not aware of them.