NX Open,怎样取到面的环LOOP

在封装的ufun .NET库里面，对UF_MODL_ask_face_loops这个函数并没有封装，导致我们很多不便，那我们在.NET下怎样才能使用这个函数呢？？当然是手动处理一下

 Public Function AskFaceLoops(ByVal faceTag As NXOpen.Tag) As loop_list()
        Dim loop_t As IntPtr
        NXOpen.Utilities.JAM.StartUFCall()
        Dim errorCode As Integer = UF_MODL_ask_face_loops(faceTag, loop_t)
        NXOpen.Utilities.JAM.EndUFCall()
        If errorCode <> 0 Then
            Throw NXOpen.NXException.Create(errorCode)
        End If
        Dim ptr As IntPtr = loop_t
        Dim loopList As New List(Of loop_list)
        While ptr <> IntPtr.Zero
            Dim loop_list_t As _loop_list = CType(Marshal.PtrToStructure(ptr, GetType(_loop_list)), _loop_list)
            Dim count As Integer
            errorCode = UF_MODL_ask_list_count(loop_list_t.edge_list, count)
            Dim edgeArray(count - 1) As NXOpen.Tag
            For i As Integer = 0 To count - 1
                UF_MODL_ask_list_item(loop_list_t.edge_list, i, edgeArray(i))
            Next
            'UF_MODL_delete_list(loop_list_t.edge_list)
            loopList.Add(New loop_list With {
                         .type = loop_list_t.type,
                         .edge_list = edgeArray})
            ptr = loop_list_t.next
        End While
        UF_MODL_delete_loop_list(loop_t)
        Return loopList.ToArray()
    End Function

    <DllImport("libufun.dll", EntryPoint:="UF_MODL_ask_face_loops", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)> _
    Friend Shared Function UF_MODL_ask_face_loops(ByVal face As Tag, <Out> ByRef loop_list As IntPtr) As Integer
    End Function

    <DllImport("libufun.dll", EntryPoint:="UF_MODL_ask_list_count", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)> _
    Friend Shared Function UF_MODL_ask_list_count(ByVal list As IntPtr, <Out> ByRef count As Integer) As Integer
    End Function

    <DllImport("libufun.dll", EntryPoint:="UF_MODL_ask_list_item", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)> _
    Friend Shared Function UF_MODL_ask_list_item(ByVal list As IntPtr, ByVal index As Integer, <Out> ByRef [object] As Tag) As Integer
    End Function
    <DllImport("libufun.dll", EntryPoint:="UF_MODL_delete_list", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)> _
    Public Shared Function UF_MODL_delete_list(ByRef list As IntPtr) As Integer
    End Function

    <DllImport("libufun.dll", EntryPoint:="UF_MODL_delete_loop_list", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)> _
    Friend Shared Function UF_MODL_delete_loop_list(ByRef list As IntPtr) As Integer
    End Function

    Friend Structure _loop_list
        Public type As Integer
        Public edge_list As IntPtr
        Public [next] As IntPtr
    End Structure

    Public Structure loop_list
        Public type As Integer 'Peripheral=1, Hole=2, Other=3
        Public edge_list() As NXOpen.Tag
    End Structure

using System;
using System.Collections.Generic;
using  System.Runtime.InteropServices;

    public class AskFaceLoop
    {
        public LoopList[] AskFaceLoops(NXOpen.Tag faceTag)
        {
           System.IntPtr loopT;
            NXOpen.Utilities.JAM.StartUFCall();
            int errorCode = UF_MODL_ask_face_loops(faceTag,out loopT);
            NXOpen.Utilities.JAM.EndUFCall();
            if (errorCode != 0)
            {
                throw NXOpen.NXException.Create(errorCode);
            }
            System.IntPtr ptr = loopT;
            List<LoopList> loopList = new List<LoopList>();
            while (ptr != IntPtr.Zero)
            {
                _loop_list loopListT = (_loop_list)Marshal.PtrToStructure(ptr, typeof(_loop_list));
                int count;
                errorCode = UF_MODL_ask_list_count(loopListT.edge_list,out count);
                NXOpen.Tag[] edgeArray = new NXOpen.Tag[count];
                for (int i = 0; i < count; i++)
                {
                    UF_MODL_ask_list_item(loopListT.edge_list, i,out edgeArray[i]);
                }
                //UF_MODL_delete_list(out loopListT.edge_list);
                loopList.Add(new LoopList{Type = loopListT.type,EdgeList = edgeArray});
                ptr = loopListT.next;
            }
            UF_MODL_delete_loop_list(out loopT);
            return loopList.ToArray();
        }

        [DllImport("libufun.dll", EntryPoint = "UF_MODL_ask_face_loops", CallingConvention = CallingConvention.Cdecl,CharSet = CharSet.Ansi)]
        internal static extern int UF_MODL_ask_face_loops(NXOpen.Tag face, out IntPtr loopList);

        [DllImport("libufun.dll", EntryPoint = "UF_MODL_ask_list_count", CallingConvention = CallingConvention.Cdecl,
            CharSet = CharSet.Ansi)]
        internal static extern int UF_MODL_ask_list_count(IntPtr list, out int count);

        [DllImport("libufun.dll", EntryPoint = "UF_MODL_ask_list_item", CallingConvention = CallingConvention.Cdecl,CharSet = CharSet.Ansi)]
        internal static extern int UF_MODL_ask_list_item(IntPtr list, int index, out NXOpen.Tag @object);

        [DllImport("libufun.dll", EntryPoint = "UF_MODL_delete_list", CallingConvention = CallingConvention.Cdecl,CharSet = CharSet.Ansi)]
        internal static extern int UF_MODL_delete_list(out IntPtr list);

        [DllImport("libufun.dll", EntryPoint = "UF_MODL_delete_loop_list", CallingConvention = CallingConvention.Cdecl,CharSet = CharSet.Ansi)]
        internal static extern int UF_MODL_delete_loop_list(out IntPtr list);

        internal struct _loop_list
        {
            public int type;
            public IntPtr edge_list;
            public IntPtr next;
        }

        public struct LoopList
        {
        /// <summary>
        /// Peripheral=1, Hole=2, Other=3
        /// </summary>
        public int Type;
            public NXOpen.Tag[] EdgeList;
        }
    }