/// <summary>
/// Read the key in the storage helper instance and get the value.
/// </summary>
/// <typeparam name="TKey">The type of key used to lookup the object.</typeparam>
/// <typeparam name="TValue">The type of object value expected.</typeparam>
/// <param name="storageHelper">The storage helper instance fo read from.</param>
/// <param name="key">The key of the target object.</param>
/// <returns>The value of the target object</returns>
/// <exception cref="KeyNotFoundException">Throws when the key is not found in storage.</exception>
public static TValue?Read <TKey, TValue>(this ISettingsStorageHelper <TKey> storageHelper, TKey key)
where TKey : notnull
{
if (storageHelper.TryRead <TValue>(key, out TValue? value))
{
return(value);
}
else
{
ThrowKeyNotFoundException(key);
return(default);
/// <summary>
/// Attempts to read the provided key and return the value.
/// If the key is not found, the fallback value will be used instead.
/// </summary>
/// <typeparam name="TKey">The type of key used to lookup the object.</typeparam>
/// <typeparam name="TValue">The type of object value expected.</typeparam>
/// <param name="storageHelper">The storage helper instance fo read from.</param>
/// <param name="key">The key of the target object.</param>
/// <param name="fallback">An alternative value returned if the read fails.</param>
/// <returns>The value of the target object, or the fallback value.</returns>
public static TValue?GetValueOrDefault <TKey, TValue>(this ISettingsStorageHelper <TKey> storageHelper, TKey key, TValue?fallback = default)
where TKey : notnull
{
if (storageHelper.TryRead <TValue>(key, out TValue? storedValue))
{
return(storedValue);
}
else
{
return(fallback);
}
}
private async Task InitRoamingSettingsHelperAsync()
{
switch (ProviderManager.Instance?.GlobalProvider?.State)
{
case ProviderState.SignedIn:
if (_remoteFileStorage == null)
{
_remoteFileStorage = await OneDriveStorageHelper.CreateForCurrentUserAsync(_serializer);
}
if (_remoteSettingsStorage == null)
{
_remoteSettingsStorage = await UserExtensionStorageHelper.CreateForCurrentUserAsync("ContosoNotes.json", _serializer);
}
break;
case ProviderState.SignedOut:
_remoteFileStorage = null;
_remoteSettingsStorage = null;
break;
}
}
private async Task <NotePageModel> GetCurrentNotePage(ISettingsStorageHelper <string> settingsStorage, IFileStorageHelper fileStorage, NotesListModel notesList)
{
if (fileStorage == null || settingsStorage == null)
{
return(null);
}
if (settingsStorage.TryRead <string>("currentNotePageId", out string currentNotePageId) && currentNotePageId != null)
{
foreach (var notesListItem in notesList.Items)
{
if (currentNotePageId == notesListItem.NotePageId)
{
string notePageFileName = GetNotePageFileName(notesListItem);
return(await fileStorage.ReadFileAsync <NotePageModel>(notePageFileName));
}
}
}
return(null);
}
