跪求UG二次开发 select的问题

gnauh

请问各位高手
小妹我目前遇到一些问题
我该如何抓取在工作窗口中，我想要的特征
. _: f" x# v6 a2 V6 C1 ?6 j5 j在抓到之后我可以再让抓到的名称做后续处理
以下是我的程序原码 希望有高手能解答

NXOpen.Session theSession = (NXOpen.Session)Activator.GetObject(typeof(NXOpen.Session), host);

UFSession theUFSession = UFSession.GetUFSession();

NXOpen.Part W_Part = theSession.Parts.Work;
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: {1 R$ z0 x% _% e: jNXOpen.UI ugUI = NXOpen.UI.GetUI();
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Selection UG_Sel = UGUI.SelectionManager;

, o2 T5 D- V1 l2 c) V, i+ Wstring Sel_msg = "Please Select Object";

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string Sel_title = "Select Test";
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. o* K) {8 k7 a9 tSelection.SelectionScope UG_Sel_SS = Selection.SelectionScope.WorkPart;
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2 ?# B# X: \7 R0 P3 j# xSelection.SelectionType[] UG_Sel_ST = new Selection.SelectionType[1] { Selection.SelectionType.All };
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Selection.SelectionAction UG_Sel_SA = Selection.SelectionAction.ClearAndEnableSpecific;
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Selection.MaskTriple[] UG_Sel_MT = new Selection.MaskTriple[1];
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4 z; [  K; ~; {6 J% dUG_Sel_MT[0].Type = UFConstants.UF_view_type;

UG_Sel_MT[0].Subtype = 0;
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UG_Sel_MT[0].SolidBodySubtype = 0;
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Point3d UG_Sel_P3D;

NXOpen.NXObject[] UG_Sel_Obj = new NXOpen.NXObject[2];
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try
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UGUI.SelectionManager.SelectObjects(Sel_msg, Sel_title, UG_Sel_SS, true, true, out UG_Sel_Obj);

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7 k  `2 u' j" {- V% T( C7 Gcatch (Exception ex)
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) G- j$ F- k+ JResponse.Write(ex.Message);
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. R9 m9 d* e2 T5 e: `7 l错误：外部组件传回例外状况。
难道是我使用错误了