判断Workspace的存在

IWorkspaceFactory.ContainsWorkspace
另外，附上帮助的例子：

        public Boolean IWorkspaceFactory_ContainsWorkspace_Example(string nameOfFile)
        {
            //use with AccessWorkspaceFactory          
            IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactoryClass();
            //for FileGDB use ESRI.ArcGIS.DataSourcesGDB.FileGDBWorkspaceFactoryClass();          
            ESRI.ArcGIS.esriSystem.IFileNames fileNames = new ESRI.ArcGIS.esriSystem.FileNamesClass();
            fileNames.Add(nameOfFile);
            return workspaceFactory.ContainsWorkspace("E:\\data\\english\\canada\\", fileNames);
        }