private async Task CheckAndCreateSinceFile()
{
var filename = GetSinceFileName();
if (await _storage.Local.FileExistsAsync(filename))
{
var json = await _storage.Local.ReadAllTextAsync(filename);
_cacheSince = await json.DeserialiseAsync<CacheSince>();
}
else
{
_cacheSince = new CacheSince();
}
}
public async Task InvalidateCache()
{
_cacheSince = new CacheSince();
WriteSinceToStorage().ConfigureAwait(false);
}