没有默认构造函数和 .NET Native 的自定义 Json 转换器

Question

我正在通用 Windows 平台 (Win10) 上编写应用程序。并且在 运行 发布模式下使用自定义 Json 转换器时出现问题，这意味着通过 .NET Native 进行编译。这是我的转换器代码

public class NestedObjectJsonConverter : JsonConverter
{
    private string childNodeName;

    public override bool CanConvert(Type objectType)
    {
        return true;
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType != JsonToken.StartObject)
        {
            return serializer.Deserialize(reader, objectType);
        }

        var rootObject = JObject.Load(reader);
        var childToken = rootObject[childNodeName];
        return ServiceModelJsonConvert.DeserializeObject(childToken, objectType);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        writer.WriteStartObject();
        writer.WritePropertyName(childNodeName);
        writer.WriteRawValue(JsonConvert.SerializeObject(value));
        writer.WriteEndObject();
    }

    public NestedObjectJsonConverter(string childNodeName)
    {
        this.childNodeName = childNodeName;
    }
}

在释放模式下触发此转换器时。它得到 "creation error" 异常，但它在调试模式下工作正常。

我已经记录了我的异常消息

HResult : -2146233088 TypeName : Newtonsoft.Json.JsonException, Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed Message : Newtonsoft.Json.JsonException: Error creating 'NestedObjectJsonConverter'. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Newtonsoft.Json.Serialization.JsonTypeReflector.<>c.b__18_1(Object param) at System.Func.Invoke(Runtime.CompilerServices.CallSiteBinder arg) at SharedLibrary!+0x3a908c at SharedLibrary!+0x3b1492 at SharedLibrary!+0x4d376a at Newtonsoft.Json.Serialization.JsonTypeReflector.<>c__DisplayClass18_0.b__0(Object[] parameters) --- End of inner exception stack trace --- at Newtonsoft.Json.Serialization.JsonTypeReflector.<>c__DisplayClass18_0.b__0(Object[] parameters) at System.Func.Invoke(Runtime.CompilerServices.CallSiteBinder arg) at Newtonsoft.Json.Serialization.JsonTypeReflector.GetJsonConverter(Object attributeProvider) at Newtonsoft.Json.Serialization.DefaultContractResolver.SetPropertySettingsFromAttributes(Json.Serialization.JsonProperty property, Object attributeProvider, String name, Type declaringType, Json.MemberSerialization memberSerialization, Boolean& allowNonPublicAccess) at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateProperty(Reflection.MemberInfo member, Json.MemberSerialization memberSerialization) at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateProperties(Type type, Json.MemberSerialization memberSerialization) at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateObjectContract(Type objectType) at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract(Type objectType) at Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract(Type type) at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.GetContractSafe(Type type) at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(Json.JsonReader reader, Type objectType, Boolean checkAdditionalContent) at Newtonsoft.Json.JsonSerializer.DeserializeInternal(Json.JsonReader reader, Type objectType) at Newtonsoft.Json.JsonSerializer.Deserialize(Json.JsonReader reader, Type objectType) at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, Json.JsonSerializerSettings settings)

似乎找到参数化构造函数是 .NET Native 中此问题的根本原因。但这是 .NET Native 或 JSON.NET ?

Answer 1

这是 .net 本机错误。它已在当前版本中修复