JsonSerializationException:无法找到用于类型的构造函数...路径“数据"，第1行，位置83

问题描述

这是从ASP.NET Core 2.0编写的webapi返回的我的Json字符串:

This is my Json String returned from my webapi wroten by ASP.NET Core 2.0:

{
    "httpStatusCode": 200,
    "isSuccess": true,
    "errorCode": null,
    "errorDetail": null,
    "data": []
}

在我的客户端中，我使用Newtonsoft.Json反序列化JsonString.

In my client I use Newtonsoft.Json to deserialize the JsonString.

JsonConvert.DeserializeObject<JsonMessage<T>>(jsonString);

在 JsonMessage 中， T 是 PageList ，在 Pagelist 中， T 是团队.

级别太多了吗?

但是有一个例外:

Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewList(JsonReader reader, JsonArrayContract contract, out bool createdFromNonDefaultCreator)
Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, object existingValue, string id)
Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, object target)
Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, string id)
Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, object existingValue)
Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, bool checkAdditionalContent)
Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
Newtonsoft.Json.JsonConvert.DeserializeObject(string value, Type type, JsonSerializerSettings settings)
Newtonsoft.Json.JsonConvert.DeserializeObject<T>(string value, JsonSerializerSettings settings)

当数据不是PagedList时，效果很好.

It works well when the data is not PagedList.

类结构:

using System;
using System.Net;
using System.Runtime.Serialization;

namespace Tower.Web
{
    [Serializable]
    [DataContract]
    public class JsonMessage<T>
    {
        [DataMember]
        public HttpStatusCode HttpStatusCode { get; set; }
        [DataMember]
        public bool IsSuccess { get; set; }
        [DataMember]
        public string ErrorCode { get; set; }
        [DataMember]
        public string ErrorDetail { get; set; }
        [DataMember]
        public T Data { get; set; }
    }
}


[Serializable]
[DataContract]
public class PagedList<T> : List<T>
{
    [DataMember]
    public long TotalCount { get; set; }
    [DataMember]
    public int PageIndex { get; set; }
    [DataMember]
    public int PageSize { get; set; }
}

[DataContract]
[Serializable]
public class Team : Base
{
    [Required]
    [Key]
    [DataMember]
    public Guid TeamId { get; set; }
    [DataMember]
    [Required]
    public string TeamName { get; set; }
    [DataMember]
    public decimal TimeZone { get; set; }
    [DataMember]
    public string TeamDescription { get; set; }
    [DataMember]
    public Guid AdminUserId { get; set; }
}

推荐答案

在空构造函数中使用属性[JsonConstructor]

use Attribute [JsonConstructor] in empty constructor

public class QuestionModel
{
    public int Id { get; set; }
    public string Question { get; set; }
    public string CorrectAnswer { get; set; }
    public string Category { get; set; }
    public string IncorrectAnswers { get; set; }
    [JsonConstructor]
    public QuestionModel() { }
}

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