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
1 k! H; u% ?4 ~+ x我该如何抓取在工作窗口中，我想要的特征
. O9 I$ \. P) d: o" r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

4 r* O. I& `/ A% z$ M# S3 g* CNXOpen.Session theSession = (NXOpen.Session)Activator.GetObject(typeof(NXOpen.Session), host);

UFSession theUFSession = UFSession.GetUFSession();

6 @( o1 q0 f$ L( @1 wNXOpen.Part W_Part = theSession.Parts.Work;
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NXOpen.UI ugUI = NXOpen.UI.GetUI();

Selection UG_Sel = UGUI.SelectionManager;
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% |/ A% U6 |$ t4 z1 Tstring Sel_msg = "Please Select Object";
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- j/ Q- [" L2 w2 s& ^5 kstring Sel_title = "Select Test";

Selection.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;
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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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UG_Sel_MT[0].Subtype = 0;
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- Y9 y& N% L. H2 y' E# JUG_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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: g$ [6 a0 h$ Z& {8 M* C* o4 Btry
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UGUI.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)
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{
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Response.Write(ex.Message);
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, M# ]6 L, c- A+ N6 b# J4 E) p}


, [" F; _$ Q/ J8 m3 F2 D) r& Z. w5 p错误：外部组件传回例外状况。
难道是我使用错误了