Hi

How to convert this union to C# for COM interop?
I thought of having several C# struct types to cover different switch type. 
But then what about the default type?
How to make sure that all C# structs have correct default size?

Also, in general, when to convert does the field names matter as long as 
they have the correct offset?

Thanks
Jas
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typedef struct _VDS_ASYNC_OUTPUT
{
    VDS_ASYNC_OUTPUT_TYPE type;

    [switch_is(type)] union
    {
        [case(VDS_ASYNCOUT_CREATELUN)]
        struct _cl
        {
            IUnknown *pLunUnk;

        } cl;

        [case(VDS_ASYNCOUT_BREAKLUNPLEX)]
        struct _blp
        {
            IUnknown *pLunUnk;

        } blp;

        // CreateTarget() return value
        [case(VDS_ASYNCOUT_CREATETARGET)]
        struct _ct
        {
            IUnknown *pTargetUnk;

        } ct;

        // CreatePortalGroup() return value
        [case(VDS_ASYNCOUT_CREATEPORTALGROUP)]
        struct _cpg
        {
            IUnknown *pPortalGroupUnk;

        } cpg;

        [default]               // This is a dummy member to make the size
        struct _dummy           // of the union identical to that used
        {                       // by the service and software provider.
            ULONGLONG ull;      // (VDS_ASYNCOUT_CREATEPARTITION).
            VDS_OBJECT_ID id;
        } dummy;
    };

} VDS_ASYNC_OUTPUT;