public async Task <dynamic> GetAllKnownWidgetZonesAsync()
{
var fileName = "widgetzones.json";
var fs = _appContext.AppDataRoot;
var cacheKey = CommonHelper.BuildScopedKey(fileName);
var rawJson = await _memoryCache.GetOrCreateAsync(cacheKey, async entry =>
{
if (fs.FileExists(fileName))
{
entry.ExpirationTokens.Add(fs.Watch(fileName));
return(await fs.ReadAllTextAsync(fileName));
}
else
{
return(string.Empty);
}
});
if (rawJson is string json && json.HasValue())
{
try
{
return(JObject.Parse(json));
}
catch
{
// Json is invalid. Don't parse again.
_memoryCache.Set(cacheKey, string.Empty);
}
}
return(null);
}