IsolatedStorage: Folders and Files

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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