跪求UG二次开发 select的问题

gnauh

请问各位高手
8 Y0 }& s+ ]8 @( ^6 o% p小妹我目前遇到一些问题
# B5 K3 m9 C0 d) U/ B2 A7 l我该如何抓取在工作窗口中，我想要的特征
/ b2 ?% i; i5 h" B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
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NXOpen.Session theSession = (NXOpen.Session)Activator.GetObject(typeof(NXOpen.Session), host);
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) r/ b+ k, w, Q  Q5 c/ U2 LUFSession theUFSession = UFSession.GetUFSession();
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NXOpen.Part W_Part = theSession.Parts.Work;

9 y. F( q. l4 `: i, v9 bNXOpen.UI ugUI = NXOpen.UI.GetUI();
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  M! K6 ]9 `! C8 M3 F9 M6 hSelection UG_Sel = UGUI.SelectionManager;
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5 @7 X/ ]2 ?% h# ?string Sel_msg = "Please Select Object";

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* x- c( k. E  ?+ W, Z& C# }string Sel_title = "Select Test";

% q5 h" r/ o9 C' Y- `) z2 wSelection.SelectionScope UG_Sel_SS = Selection.SelectionScope.WorkPart;
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+ r! d5 }+ v  X2 ~9 B/ ?5 ASelection.SelectionType[] UG_Sel_ST = new Selection.SelectionType[1] { Selection.SelectionType.All };
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( H4 `# q4 |) xSelection.SelectionAction UG_Sel_SA = Selection.SelectionAction.ClearAndEnableSpecific;
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Selection.MaskTriple[] UG_Sel_MT = new Selection.MaskTriple[1];
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UG_Sel_MT[0].Type = UFConstants.UF_view_type;
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3 s& o1 K8 _4 t1 d; i) T! |UG_Sel_MT[0].Subtype = 0;

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

NXOpen.NXObject[] UG_Sel_Obj = new NXOpen.NXObject[2];

  B3 o* N$ L1 b" S# H6 mtry
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+ \5 r) T  B* M, z1 O* X{

) P2 t: `* T9 H& d3 A4 X$ XUGUI.SelectionManager.SelectObjects(Sel_msg, Sel_title, UG_Sel_SS, true, true, out UG_Sel_Obj);

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' M+ Y9 F  r& j' e0 }3 X) k% dcatch (Exception ex)
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Response.Write(ex.Message);
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}
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3 i1 v) k2 u: K% {6 B  Q错误：外部组件传回例外状况。
难道是我使用错误了