UWP写入CSV文件

Question

I'm trying to write down my dataset into a csv file with the following code

 const string filePath = @"F:\train\data.csv";

  foreach (var i in _trainingList)
        {
            var newLine = string.Format("{0},{1},{2}", i.Item1, i.Item2, i.Item3);
            _csv.AppendLine(newLine);
        }
  Task.Run(() =>
        {
            //TODO unauthorized exception
            File.WriteAllText(filePath, _csv.ToString());
        });

I get an System.UnauthorizedAccessException , I have checked that the file allows reading and writing.

Is the problem arising because I'm using UWP platform and does not support the operation. or is my code erroneous?

Answer 1

You can only access files in the user's Download folder that were created by your application. It's likely that F:\\train is not that folder.

See this MSDN article for what folders a UWP (or Windows Store) app can access: https://msdn.microsoft.com/en-us/library/windows/apps/mt188700.aspx