/// <summary>
/// Asynchronously write the local storage to disk.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private async Task Write()
{
try
{
using var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
using var stream = isolatedStorage.OpenFile(ProtectedStorageFileName, FileMode.Create, FileAccess.Write, FileShare.None);
using var dataProtectionStream = new DataProtectionStream(stream, System.Security.Cryptography.DataProtectionScope.CurrentUser);
await JsonSerializer.SerializeAsync(dataProtectionStream, _values).ConfigureAwait(false);
dataProtectionStream.FlushFinalBlock();
dataProtectionStream.Close();
stream.Close();
}
finally
{
_writeTask = null;
}
}
/// <summary>
/// Asynchronously read the local storage from disk.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private async Task Read()
{
try
{
using var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
if (isolatedStorage.FileExists(ProtectedStorageFileName))
{
using var stream = isolatedStorage.OpenFile(ProtectedStorageFileName, FileMode.Open, FileAccess.Read, FileShare.None);
using var dataProtectionStream = new DataProtectionStream(stream, System.Security.Cryptography.DataProtectionScope.CurrentUser);
_values = await JsonSerializer.DeserializeAsync<ConcurrentDictionary<string, string>>(dataProtectionStream).ConfigureAwait(false);
dataProtectionStream.Close();
stream.Close();
}
if (_values == null)
{
_values = new ConcurrentDictionary<string, string>();
}
}
finally
{
_readTask = null;
}
}