#json #serialization #json.net
#json #сериализация #json.net
Вопрос:
Учитывая следующую структуру классов, которая включает в себя словарь производных объектов, как я могу сериализовать и десериализовать с помощью библиотеки Json от NewtonSoft? При десериализации я получаю исключение. Похоже, у него возникли проблемы с восстановлением словаря.
[JsonObject(MemberSerialization.OptIn)]
public class GameObject
{
[JsonProperty]
public string Id { get; set; }
[JsonProperty]
public string Name { get; set; }
[JsonProperty]
public ConcurrentDictionary<string, Component> Components;
public GameObject()
{
Components = new ConcurrentDictionary<string, Component>();
}
}
[JsonObject(MemberSerialization.OptIn)]
public class Component
{
[JsonIgnore] // Ignore circular reference
public GameObject GameObject { get; set; }
public Component()
{
}
}
[JsonObject(MemberSerialization.OptIn)]
public class TestComponent : Component
{
[JsonProperty]
public int MyProperty { get; set; }
public TestComponent()
{
}
}
var originalJson = JsonConvert.SerializeObject(srcObject, Formatting.None,
new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All,
TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple
});
var newObject = JsonConvert.DeserializeObject<GameObject>(originalJson,
new JsonSerializerSettings()
{
TypeNameHandling = TypeNameHandling.All,
TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple
});
Исключение при вызове DeserializeObject:
System.Reflection.TargetInvocationException was unhandled by user code
Message=Exception has been thrown by the target of an invocation.
Source=mscorlib
StackTrace:
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStructamp; sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at Newtonsoft.Json.Serialization.JsonContract.InvokeOnDeserialized(Object o, StreamingContext context) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonContract.cs:line 135
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateDictionary(IWrappedDictionary dictionary, JsonReader reader, JsonDictionaryContract contract, String id) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 638
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateDictionary(JsonReader reader, JsonDictionaryContract contract, String id) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 593
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 387
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 223
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueProperty(JsonReader reader, JsonProperty property, Object target, Boolean gottenCurrentValue, Object currentValue) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 198
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObjectFromNonDefaultConstructor(JsonReader reader, JsonObjectContract contract, String id) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 876
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateAndPopulateObject(JsonReader reader, JsonObjectContract contract, String id) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 846
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 396
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 223
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueNonProperty(JsonReader reader, Type objectType, JsonContract contract) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 208
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonSerializationJsonSerializerInternalReader.cs:line 120
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonJsonSerializer.cs:line 421
at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonJsonSerializer.cs:line 413
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonJsonConvert.cs:line 721
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings) in d:DevelopmentReleasesJsonWorkingSrcNewtonsoft.JsonJsonConvert.cs:line 683
at MF.Tests.GameServer.ComponentSerializationTests.TestSerializationOfObjectWithComponent() in C: ComponentSerializationTests.cs:line 119
InnerException: System.NullReferenceException
Message=Object reference not set to an instance of an object.
Source=mscorlib
StackTrace:
at System.Collections.Concurrent.ConcurrentDictionary`2.InitializeFromCollection(IEnumerable`1 collection)
at System.Collections.Concurrent.ConcurrentDictionary`2.OnDeserialized(StreamingContext context)
InnerException:
Обновить:
Если изменить ConcurrentDictionary на список или словарь, код работает так, как ожидалось.
Что я делаю не так?
Комментарии:
1. У меня точно такая же проблема… Похоже, есть что-то интересное в сериализации / десериализации параллельного словаря с объектами в нем.