核心3.1如何完全使用COM组件

Question

I'm using dynamic to access COM components in core 3.1, and it's not work.

Try with A small wrapper around COM interop , it's almost ok except index property such as var sheet = wb.Sheets[1]; I had to override TryGetIndex function. So I must get the type of a comobject with Reflection-with-IDispatch-based-COM-objects , but it's not work in core 3.1:

System.MissingMethodException:“Method not found: 'System.Type System.Runtime.InteropServices.Marshal.GetTypeForITypeInfo(IntPtr)'.”

And

C:\\Windows\\Microsoft.NET\\assembly\\GAC_64\\CustomMarshalers\\v4.0_4.0.0.0__b03f5f7f11d50a3a\\CustomMarshalers.dll

C:\\Windows\\WinSxS\\amd64_custommarshalers_b03f5f7f11d50a3a_10.0.17134.1_none_e788457a14459849\\CustomMarshalers.dll

has been tried.

Can anyone help me?

Answer 1

Solved based on CyrusNajmabadi's reply

public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
    result = WrapIfRequired(
        _instance.GetType()
            .InvokeMember(
                "Item",
                BindingFlags.GetProperty,
                Type.DefaultBinder,
                _instance,
                indexes
            ));
    return true;
}

It's worked!Thanks!