Engine中如何创建内存图层？

IWorkspaceFactory inMemoryWorkspaceFactory = new InMemoryWorkspaceFactoryClass();

            // Create a new in-memory workspace. This returns a name object.

            IWorkspaceName inMemoryWorkspaceName = inMemoryWorkspaceFactory.Create(null, MyWorkspace, null, 0);

            IWorkspaceFactory fileGDBWF = new FileGDBWorkspaceFactoryClass();

            IWorkspaceName workspaceName = new WorkspaceNameClass();

            workspaceName.PathName = @E:\ZhuXinying\testData\test.gdb;

            workspaceName.WorkspaceFactoryProgID = esriDataSourcesGDB.FileGDBWorkspaceFactory;

            bool flag = fileGDBWF.Copy(workspaceName, , out inMemoryWorkspaceName);

            IName name = (IName)inMemoryWorkspaceName;

            IWorkspace inmemoryWorkspace = name.Open() as IWorkspace;//刚建立的内存工作空间

            IFeatureClass featureClass = openFeatureClass(inmemoryWorkspace,Polyline);

addFeatureLayer(axMapControl1.Map, featureClass);



 private IFeatureClass openFeatureClass(IWorkspace workspace, string name)

        {

            IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;

            IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(name);

            return featureClass;

        }

  private void addFeatureLayer(IMap map, IFeatureClass featureClass)

        {

            IFeatureLayer featureLayer = new FeatureLayerClass();

            featureLayer.FeatureClass = featureClass;

            featureLayer.Name = (featureClass as IDataset).Name;

            map.AddLayer(featureLayer as ILayer);

            axMapControl1.Refresh();

        }