c# - GetLocalWorkspaceInfo always get null -

my problem similar tfs api: getlocalworkspaceinfo returns null, except using visual studio 2015, answers don't work me. , tried getalllocalworkspaceinfo, returns null well.

thanks

i have tested code snippet referred in vs 2015 , got successful result. make sure have reference dlls in vs 2015: c:\program files (x86)\microsoft visual studio 14.0\common7\ide\commonextensions\microsoft\teamfoundation\t‌​eam explorer

and in code snippet, need use console.writeline output workspace information want:

private static workspace findworkspacebypath(tfsteamprojectcollection tfs, string workspacepath)         {              versioncontrolserver versioncontrol = tfs.getservice<versioncontrolserver>();              workspaceinfo workspaceinfo = workstation.current.getlocalworkspaceinfo(workspacepath);              if (workspaceinfo != null)             {                 console.writeline(workspaceinfo.computer);                 console.writeline(workspaceinfo.displayname);                 return versioncontrol.getworkspace(workspaceinfo);             }              //no workspace found using method 1, try query workspaces user has on machine.             workspace[] workspaces = versioncontrol.queryworkspaces(null, environment.username, environment.machinename);             foreach (workspace w in workspaces)             {                 foreach (workingfolder f in w.folders)                 {                     if (f.localitem.equals(workspacepath))                     {                         return w;                     }                 }             }              throw new exception(string.format("tfs workspace cannot determined {0}.", workspacepath));         }