Windows Phone 8 - Folders and files

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

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);

The sample project

You can download the sample project here.


The original post is in the Microsoft TechNet Wiki