c# - How can I make sure that a file inside a Dropbox is really gone after delete? -

i using files inside dropbox communicate between servers. after while realized every once in while there delay in basic file operations when executed on file inside dropbox.

what need this:

public class myfile {     const int maxwaitcount = 60;     //..     /// <summary>     /// remove file - has work inside dropbox directory     /// </summary>     /// <returns>0 ok or error code</returns>     public int rm()     {         string name = os.wininternal(fullname);         if (file.exists(name))         {             file.delete(name);             #region double check if file gone             if (ensure)                 return awaitfilevanishing(name);             #endregion         }         return 0;     }     //..     private int awaitfilematerializing(string filename) //..     private int awaitfilevanishing(string filename) //..     /// <summary>     /// constructor: auto-ensure mode file systems not synchronously wait end of io operation i.e. dropbox     /// </summary>     /// <remarks>only use ensure mode if has guaranteed io operation done     /// when method call returns; necessary e.g. dropbox directories since (currently) dropbox first updates     /// file in invisible . folder , asynchronously updates visible file , remote copies of it</remarks>     /// <param name="filename"></param>     public myfile(string filename)     {         ensure = filename.tolower().contains("dropbox");         // ..     } } 

since needed quick solution, came 1 presenting answer own question below. however, can imagine of had problem , found different, possibly more compelling solution. please let me know.

this current solution awaitfilematerializing , awaitfilevanishing used part of myfile.

    private int awaitfilematerializing(string filename)     {         int count = 0;         bool exists = false;         while (count < maxwaitcount)         {             try             {                 exists = file.exists(filename);             }             catch (exception) { }   // device not ready exception if win 2003             if (exists)                 break;             thread.sleep(5);             count++;         }         if (count >= maxwaitcount)             throw new filenotfoundexception("ensure failed - timeout.", filename);         return -count;     }     private int awaitfilevanishing(string filename)     {         int count = 0;         bool exists = true;         while (count < maxwaitcount)         {             try             {                 exists = file.exists(filename);             }             catch (exception) { }   // device not ready exception if win 2003             if (!exists)                 break;             thread.sleep(5);             count++;         }         if (count >= maxwaitcount)             throw new ioexception("ensure failed - timeout in deleting " + filename + ".");         return -count;     }