Get Service From TFS Model

public class TFSModal
    {
        public static readonly TFSModal Instance = new TFSModal("win-ruizyi");

        public TeamFoundationServer TFServer { get; set; }

        public WorkItemStore WorkItemStore { get; set; }

        public ICommonStructureService CommonStructureService { get; set; }

        public VersionControlServer VersionControlServer { get; set; }

        public IGroupSecurityService GroupSecurityService { get; set; }

        public IBuildServer BuildServer { get; set; }
        
        public TFSModal(string serverName)
        {
            try
            {

                TFServer = TeamFoundationServerFactory.GetServer(serverName);
                WorkItemStore = (WorkItemStore)TFServer.GetService(typeof(WorkItemStore));
                VersionControlServer = (VersionControlServer)TFServer.GetService(typeof(VersionControlServer));
                CommonStructureService = (ICommonStructureService)TFServer.GetService(typeof(ICommonStructureService));
                GroupSecurityService = (IGroupSecurityService)TFServer.GetService(typeof(IGroupSecurityService));
                BuildServer = (IBuildServer)TFServer.GetService(typeof(IBuildServer));
            }
            catch { }

           
        }

        public Workspace[] GetWorkSpaceList(string workspacename, string workspaceowner, string computername)
        {
            return VersionControlServer.QueryWorkspaces(workspacename, workspaceowner, computername);
        }

        public ProjectInfo[] GetAllProjects()
        {
            var projects= CommonStructureService.ListAllProjects();

           
            
            

            return projects;
        }

    }