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
- d" K4 K( U! F# P在抓到之后我可以再让抓到的名称做后续处理
, N5 @9 Z( a" i9 ^$ u$ K% U: s1 ^以下是我的程序原码 希望有高手能解答

9 ?$ x. ^% N+ l0 h( C  V, @NXOpen.Session theSession = (NXOpen.Session)Activator.GetObject(typeof(NXOpen.Session), host);

& Y2 `: q/ `  kUFSession theUFSession = UFSession.GetUFSession();

NXOpen.Part W_Part = theSession.Parts.Work;
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NXOpen.UI ugUI = NXOpen.UI.GetUI();
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9 C- m% ^/ \4 [  {Selection UG_Sel = UGUI.SelectionManager;
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string Sel_msg = "Please Select Object";
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! q! D- N! o# b2 cstring Sel_title = "Select Test";
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0 U# D% A" w6 Y/ N: pSelection.SelectionScope UG_Sel_SS = Selection.SelectionScope.WorkPart;

Selection.SelectionType[] UG_Sel_ST = new Selection.SelectionType[1] { Selection.SelectionType.All };

Selection.SelectionAction UG_Sel_SA = Selection.SelectionAction.ClearAndEnableSpecific;

Selection.MaskTriple[] UG_Sel_MT = new Selection.MaskTriple[1];

UG_Sel_MT[0].Type = UFConstants.UF_view_type;

  t' Y+ g) z3 f7 MUG_Sel_MT[0].Subtype = 0;
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UG_Sel_MT[0].SolidBodySubtype = 0;

1 A+ L( C4 n) b9 _* a! NPoint3d UG_Sel_P3D;

+ Y) e2 j0 a8 K. h8 i3 Y/ ^* f- }. ENXOpen.NXObject[] UG_Sel_Obj = new NXOpen.NXObject[2];

* Z8 q1 P" Q( ?# P1 J  Q$ Wtry

{
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% o( X" X* O# h9 J$ x) q  FUGUI.SelectionManager.SelectObjects(Sel_msg, Sel_title, UG_Sel_SS, true, true, out UG_Sel_Obj);
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}
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catch (Exception ex)

{

Response.Write(ex.Message);
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' U* M5 b" B" E' V8 V}

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错误：外部组件传回例外状况。
难道是我使用错误了