/// <inheritdoc />
public virtual IDictionary<string, object> LoadTempData(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// Accessing Session property will throw if the session middleware is not enabled.
var session = context.Session;
var tempDataDictionary = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
byte[] value;
if (session.TryGetValue(TempDataSessionStateKey, out value))
{
using (var memoryStream = new MemoryStream(value))
using (var writer = new BsonReader(memoryStream))
{
tempDataDictionary = _jsonSerializer.Deserialize<Dictionary<string, object>>(writer);
}
var convertedDictionary = new Dictionary<string, object>(
tempDataDictionary,
StringComparer.OrdinalIgnoreCase);
foreach (var item in tempDataDictionary)
{
var jArrayValue = item.Value as JArray;
var jObjectValue = item.Value as JObject;
if (jArrayValue != null && jArrayValue.Count > 0)
{
var arrayType = jArrayValue[0].Type;
Type returnType;
if (_tokenTypeLookup.TryGetValue(arrayType, out returnType))
{
var arrayConverter = _arrayConverters.GetOrAdd(returnType, type =>
{
return (Func<JArray, object>)_convertArrayMethodInfo
.MakeGenericMethod(type)
.CreateDelegate(typeof(Func<JArray, object>));
});
var result = arrayConverter(jArrayValue);
convertedDictionary[item.Key] = result;
}
else
{
var message = Resources.FormatTempData_CannotDeserializeToken(nameof(JToken), arrayType);
throw new InvalidOperationException(message);
}
}
else if (jObjectValue != null)
{
if (!jObjectValue.HasValues)
{
convertedDictionary[item.Key] = null;
continue;
}
var jTokenType = jObjectValue.Properties().First().Value.Type;
Type valueType;
if (_tokenTypeLookup.TryGetValue(jTokenType, out valueType))
{
var dictionaryConverter = _dictionaryConverters.GetOrAdd(valueType, type =>
{
return (Func<JObject, object>)_convertDictMethodInfo
.MakeGenericMethod(type)
.CreateDelegate(typeof(Func<JObject, object>));
});
var result = dictionaryConverter(jObjectValue);
convertedDictionary[item.Key] = result;
}
else
{
var message = Resources.FormatTempData_CannotDeserializeToken(nameof(JToken), jTokenType);
throw new InvalidOperationException(message);
}
}
else if (item.Value is long)
{
var longValue = (long)item.Value;
if (longValue < int.MaxValue)
{
// BsonReader casts all ints to longs. We'll attempt to work around this by force converting
// longs to ints when there's no loss of precision.
convertedDictionary[item.Key] = (int)longValue;
}
}
}
tempDataDictionary = convertedDictionary;
// If we got it from Session, remove it so that no other request gets it
session.Remove(TempDataSessionStateKey);
}
else
{
// Since we call Save() after the response has been sent, we need to initialize an empty session
// so that it is established before the headers are sent.
session.Set(TempDataSessionStateKey, new byte[] { });
}
return tempDataDictionary;
}