调用ArcToolBox里的Tool的三种方法

一.用 IArcToolboxExtension获得工具赋给pGPToolCommandHelper2,然后InvokeModal   UID pUid = new UIDClass();             pUid.Value = "esriGeoprocessingUI.ArcToolboxExtension";             IArcToolboxExtension pATBExt = m_application.FindExtensionByCLSID(pUid) as IArcToolboxExtension;             IGPTool pTool = pATBExt.ArcToolbox.GetToolbyNameString("ExportCAD");   IGPToolCommandHelper2 pGPToolCommandHelper2 = new GPToolCommandHelperClass() as IGPToolCommandHelper2;             pGPToolCommandHelper2.SetTool(pTool);             Boolean pOk;             IGPMessages pGPMessages;             pGPToolCommandHelper2.InvokeModal(m_application.hWnd, null, out pOk, out pGPMessages); 二.用IWorkspaceFactory 根据工具的文件路径找ToolBoxes,Conversion Tools,然后ExportCAD工具,然后InvokeModal IWorkspaceFactory pToolboxWorkspaceFactory = new ToolboxWorkspaceFactoryClass();             IToolboxWorkspace pToolboxWorkspace = (IToolboxWorkspace)pToolboxWorkspaceFactory.OpenFromFile(@"D:\ArcGIS\ArcToolbox\Toolboxes", 0);             IGPToolbox toolbox = (IGPToolbox)pToolboxWorkspace.OpenToolbox("Conversion Tools");             IGPTool pTool = toolbox.OpenTool("ExportCAD");             IGPToolCommandHelper2 pGPToolCommandHelper2 = new GPToolCommandHelperClass() as IGPToolCommandHelper2;             //pGPToolCommandHelper2.SetTool(pTool);             pGPToolCommandHelper2.SetToolByName("Conversion Tools", "ExportCAD");             Boolean pOk;             IGPMessages pGPMessages;             pGPToolCommandHelper2.InvokeModal(m_application.hWnd, null, out pOk, out pGPMessages); 三.  直接用SetToolByName方法 IGPToolCommandHelper2 pGPToolCommandHelper2 = new GPToolCommandHelperClass() as IGPToolCommandHelper2;             //pGPToolCommandHelper2.SetTool(pTool);             pGPToolCommandHelper2.SetToolByName("Conversion Tools", "ExportCAD");             Boolean pOk;             IGPMessages pGPMessages;             pGPToolCommandHelper2.InvokeModal(m_application.hWnd, null, out pOk, out pGPMessages);