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[C#] Adding a layer to shapefile from Add Data Dialog

Question asked by conorbarber_CedarPark on Apr 2, 2013
Latest reply on Apr 6, 2013 by conorbarber_CedarPark

I am trying to add a layer to a shapefile. My code is currently very similar to what is provided by ESRI:

private void AddShapeFile() {   // Create a new ShapefileWorkspaceFactory object and   // open a shapefile folder - the path works with standard 9.3 installation   IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactoryClass();   IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)     workspaceFactory.OpenFromFile(     "C:\\Program Files\\ArcGIS\\DeveloperKit\\SamplesNET\\data\\Y2000HurricaneData", 0);   // Create a new FeatureLayer and assign a shapefile to it   IFeatureLayer featureLayer = new FeatureLayerClass();   featureLayer.FeatureClass = featureWorkspace.OpenFeatureClass("2000_hrcn");   ILayer layer = (ILayer)featureLayer;   layer.Name = featureLayer.FeatureClass.AliasName;   // Add the Layer to the focus map   ESRI.ArcGIS.ArcMapUI.IMxDocument mxDocument =      (ESRI.ArcGIS.ArcMapUI.IMxDocument)(m_application.Document);   IMap map = mxDocument.FocusMap;   map.AddLayer(layer); }

However, I cannot get the "m_application" reference to work. The instructions provided say that this code "assumes that you already have m_application variable as a reference to the Application object in your .NET custom component". What does this mean? How do I make this reference?

Below is my code FWIW. It essentially does the same as above except passes a shapefile chosen from an Add Data dialog that I created from IgxObject.

        private void btnOpenShapefile_Click(object sender, EventArgs e)         {             ESRI.ArcGIS.Catalog.IGxObjectFilterCollection pGxFilter; //establish a collection of filters             ESRI.ArcGIS.Catalog.GxFilterShapefiles pfilter2; //create a filter              Boolean notanythingselected;             ESRI.ArcGIS.Catalog.IGxObject gxObj; //declare an instance of GxObjects             ESRI.ArcGIS.CatalogUI.IGxDialog pGxDia; //declare an instance of GxDialogs             pfilter2 = new ESRI.ArcGIS.Catalog.GxFilterShapefiles(); //create a filter instance               pGxDia = new GxDialogClass(); //new dialog box object             pGxDia.Title = "Choose a Shapefile";              pGxFilter = (ESRI.ArcGIS.Catalog.IGxObjectFilterCollection)pGxDia;               pGxFilter.AddFilter(pfilter2, true);             ESRI.ArcGIS.Catalog.IEnumGxObject gxEnum = null;                            notanythingselected = pGxDia.DoModalOpen(this.Handle.ToInt32(), out gxEnum);             if (notanythingselected == false)             {                 return;             }             else             {                 gxEnum.Reset();                 gxObj = gxEnum.Next();                  ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wksFact;                 wksFact = new ShapefileWorkspaceFactory();                                       ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featWrk;                 featWrk = (IFeatureWorkspace)wksFact.OpenFromFile(gxObj.Parent.FullName, 0);                  ESRI.ArcGIS.Geodatabase.IFeatureClass fClass;                 fClass = featWrk.OpenFeatureClass(gxObj.Name);                  ESRI.ArcGIS.Carto.IFeatureLayer lyr;                 lyr = new FeatureLayer();                 lyr.FeatureClass = fClass;                 lyr.Name = gxObj.Name;                  ESRI.ArcGIS.ArcMapUI.IMxDocument mxDoc = (ESRI.ArcGIS.ArcMapUI.IMxDocument)(m_application.Document); //ERROR IS HERE AT M_application                 IMap map = mxDoc.FocusMap;                 map.AddLayer(lyr);                 

I hope this has a super simple answer. I'm pretty new at this :)