private static string GetJson(DataType dataType, bool createIfNotExist = false)
{
string s = null;
switch (dataType)
{
case DataType.User:
if (createIfNotExist && AppData.user == null)
{
AppData.user = new UserInfo();
}
s = JsonConvert.SerializeObject(AppData.user);
break;
case DataType.Car:
if (createIfNotExist && AppData.cars == null)
{
AppData.cars = new List <CarInfo>();
}
s = JsonConvert.SerializeObject(AppData.cars);
break;
case DataType.DeviceLocation:
if (createIfNotExist && AppData.deviceLocation == null)
{
AppData.deviceLocation = new DeviceLocationInfo();
}
s = JsonConvert.SerializeObject(AppData.deviceLocation);
break;
default:
ErrorReporter.Report($"Upload DataType \"{dataType}\" haven't been implemented!");
return(null);
}
return(s);
}
public static async Task DownloadAsync(DataType dataType)
{
indexRetry :;
try
{
var blockBlob = await GetBlockBlobForAppDataAsync(dataType);
string s;
if (!await blockBlob.ExistsAsync())
{
s = GetJson(dataType, true);
if (await App.Current.MainPage.DisplayAlert("", $"You haven't save any \"{dataType}\" data on cloud!\r\nCreate now?", "Yes", "No"))
{
await UploadAsync(dataType);
await new JustAlert($"\"{dataType}\" data created on cloud!").Show();
}
}
else
{
s = await blockBlob.DownloadTextAsync();
}
switch (dataType)
{
case DataType.User:
AppData.user = JsonConvert.DeserializeObject <UserInfo>(s);
break;
case DataType.Car:
AppData.cars = JsonConvert.DeserializeObject <List <CarInfo> >(s);
break;
case DataType.DeviceLocation:
AppData.deviceLocation = JsonConvert.DeserializeObject <DeviceLocationInfo>(s);
break;
default:
ErrorReporter.Report($"Download DataType \"{dataType}\" haven't been implemented!");
throw new OperationCanceledException();
}
}
catch (Microsoft.WindowsAzure.Storage.StorageException error)
{
if (error.Message == "An error occurred while sending the request")
{
if (await App.Current.MainPage.DisplayAlert("無法連線", "資料下載失敗，請將您的裝置連上網路後再重試一次", "重試", "取消"))
{
goto indexRetry;
}
else
{
throw new OperationCanceledException();
}
}
else
{
await new ErrorAlert("StorageException: 使用者資料下載失敗", error).Show();
throw new OperationCanceledException();
}
}
catch (Exception error)
{
await new ErrorAlert("Exception: 使用者資料下載失敗", error).Show();
throw new OperationCanceledException();
}
}
