private async Task <CachedCountries> GetCachedCounriesAsync()
{
CachedCountries cached = new CachedCountries()
{
LastCached = DateTime.MinValue
};
await Task.Run(() =>
{
try
{
XmlSerializer formatter = new XmlSerializer(typeof(CachedCountries));
var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "countries.xml");
if (File.Exists(path))
{
using (var sr = new StreamReader(path))
{
cached = (CachedCountries)formatter.Deserialize(sr);
}
}
}
catch (Exception e)
{
var x = e.Message;
throw;
}
});
return(cached);
}
private async Task CacheCountriesAsync(CachedCountries toCache)
{
await Task.Run(() =>
{
XmlSerializer formatter = new XmlSerializer(typeof(CachedCountries));
var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "countries.xml");
using (var writer = new StreamWriter(path))
{
formatter.Serialize(writer, toCache);
}
});
}
public async Task <IEnumerable <Country> > GetCountriesAsync()
{
var cached = new CachedCountries();
cached = await GetCachedCounriesAsync();
if (cached.LastCached < DateTime.Now.AddDays(-7))
{
var countries = await CountriesService.GetCountriesAsync();
foreach (var c in countries)
{
cached.Countries.Add(c);
}
cached.LastCached = DateTime.Now;
CacheCountriesAsync(cached);
}
return(cached.Countries);
}
