windows 10 - UWP apps accessing files from random location on system -

in uwp there files , permissions restrictions, can acces files directly few folders or can use filepicker access anywhere on system. how can use files picked filepicker , use them anytime again when app runs ? tried use them again path gives permission error. know "futureacceslist" limit 1000 , make app slow if not wrong? . there better way ? or can store storage files link somehow in local sqlite database?

considering method..

    public async static task<byte[]> tobytearray(this storagefile file)     {         byte[] filebytes = null;         using (irandomaccessstreamwithcontenttype stream = await file.openreadasync())         {             filebytes = new byte[stream.size];              using (datareader reader = new datareader(stream))             {                 await reader.loadasync((uint)stream.size);                 reader.readbytes(filebytes);             }         }          return filebytes;     } 

this class..

    public class appfile     {         public string filename { get; set; }         public byte[] bytearray { get; set; }     } 

and variable

    list<appfile> _appfiles = new list<appfile>(); 

just..

    var fileopenpicker = new fileopenpicker();     ireadonlylist<storagefile> files = await fileopenpicker.pickmultiplefilesasync();      foreach (var file in files)     {         var bytearray = await file.tobytearray();         _appfiles.add(new appfile { filename = file.displayname, bytearray = bytearray });     } 

update

using newtonsoft.json; using system.linq; using windows.security.credentials; using windows.storage;  namespace your.namespace {     public class stateservice     {         public void savestate<t>(string key, t value)         {             var localsettings = applicationdata.current.localsettings;             localsettings.values[key] = jsonconvert.serializeobject(value);         }          public t loadstate<t>(string key)         {             var localsettings = applicationdata.current.localsettings;             if (localsettings.values.containskey(key))                 return jsonconvert.deserializeobject<t>(((string)    localsettings.values[key]));             return default(t);         }          public void removestate(string key)         {             var localsettings = applicationdata.current.localsettings;             if (localsettings.values.containskey(key))                 localsettings.values.remove((key));         }          public void clear()         {             applicationdata.current.localsettings.values.clear();         }     } }