Simon Mourier's Blog - Marshal [in] reference without ref

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Marshal [in] reference without ref

Sep 5, 2017 See the question and my original answer on StackOverflow

You're looking for MarshalAs(UnmanagedType.LPStruct):

[DllImport("shell32.dll")]
[return: MarshalAs(UnmanagedType.IUnknown)]
static extern object SHBindToObject(
    IShellFolder psf,
    IntPtr pidl, 
    [MarshalAs(UnmanagedType.IUnknown)] object pbc,  
    [MarshalAs(UnmanagedType.LPStruct)] Guid riid);