IsolatedStorage: Folders and Files

In this blog we will learn about IsolatedStorage.

Introduction

Windows Phone 8 introduced the ApplicationData class to easily work with IsolatedStorage and async/awaitkeywords.

In Windows Phone currently it is possible to use only LocalFolder because RoamingStorage and TemporaryStorage throw the NotSupportedException.

 

However, all the operations can be done with a few lines.

How to use folders

Create folder

StorageFolder folder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("myFolder", CreationCollisionOption.ReplaceExisting);

Read folder

var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");

Check if folder exists

StorageFolder folder;
try
   {
      folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");
      MessageBox.Show(folder.Name);
   }
catch (FileNotFoundException ex)
   {
      MessageBox.Show("Folder not found");
   }

Read all folders

var folders = await ApplicationData.Current.LocalFolder.GetFoldersAsync();
foreach (var folder in folders)
   MessageBox.Show(folder.Name);

Rename folder

var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");
await folder.RenameAsync("myRenamedFolder");

Delete folder

var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");
await folder.DeleteAsync(StorageDeleteOption.PermanentDelete);

How to use files

Create file

var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myFile.txt", CreationCollisionOption.ReplaceExisting);

Read all files

var files = await ApplicationData.Current.LocalFolder.GetFilesAsync();
foreach (var file in files)
   MessageBox.Show(file.Name);

Check if file exists

StorageFile file;
try
   {
      file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
      MessageBox.Show(file.Name);
   }
catch (FileNotFoundException ex)
   {
      MessageBox.Show("file not found");
   }

Write file

var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myFile.txt", CreationCollisionOption.ReplaceExisting);
var stream = await file.OpenAsync(FileAccessMode.ReadWrite);
using (var writer = new DataWriter(stream.GetOutputStreamAt(0)))
   {
      writer.WriteString("Hello");
      await writer.StoreAsync();
      await writer.FlushAsync();
   }

Read file

var file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
var stream = await file.OpenAsync(FileAccessMode.Read);
using (var reader = new DataReader(stream.GetInputStreamAt(0)))
   {
      var bytes = await reader.LoadAsync((uint)stream.Size);
      var s = reader.ReadString(bytes);
      MessageBox.Show(s);
   }

Rename file

var file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
await file.RenameAsync("myFileRenamed.txt");

Delete file

var file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
await file.DeleteAsync(StorageDeleteOption.PermanentDelete);

Copy file

var file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");
await file.CopyAsync(folder);

Move file

var file = await ApplicationData.Current.LocalFolder.GetFileAsync("myFile.txt");
var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync("myFolder");
await file.MoveAsync(folder);

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