ComDataHelpers.cs

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using System.Runtime.Versioning;
 
namespace System.Runtime.InteropServices.CustomMarshalers;
 
internal static class ComDataHelpers
{
    [SupportedOSPlatform("windows")]
    public static TView GetOrCreateManagedViewFromComData<T, TView>(object comObject, Func<T, TView> createCallback)
    {
        object typeFromHandle = typeof(TView);
        object comObjectData = Marshal.GetComObjectData(comObject, typeFromHandle);
        if (comObjectData is TView)
        {
            return (TView)comObjectData;
        }
        TView val = createCallback((T)comObject);
        if (!Marshal.SetComObjectData(comObject, typeFromHandle, val))
        {
            val = (TView)Marshal.GetComObjectData(comObject, typeFromHandle);
        }
        return val;
    }
}