C# Newtonsoft反序列化带有声明的自定义对象？
C# Newtonsoft反序列化带有声明的自定义对象？
提问于 2020-08-28 21:24:13
我有以下简单的POCO：
public class ApiKey
{
public ApiKey(string key, string owner, List<Claim> claims = null)
{
Key = key;
OwnerName = owner;
Claims = claims ?? new List<Claim>();
}
public string Key { get; }
public string OwnerName { get; }
public IReadOnlyCollection<Claim> Claims { get; set; }
}我可以用一个声明创建这个对象的一个实例，并用Newtonsoft序列化它：
JsonConvert.SerializeObject(key)并获得一个序列化的ApiKey，如下所示：
"{\"Key\":\"94a5b81f-9837-4c5f-9821-3ebaedc6435d\",\"OwnerName\":null,\"Claims\":[{\"Issuer\":\"LOCAL AUTHORITY\",\"OriginalIssuer\":\"LOCAL AUTHORITY\",\"Properties\":{},\"Subject\":null,\"Type\":\"AdminClaim\",\"Value\":\"AdminClaim\",\"ValueType\":\"http://www.w3.org/2001/XMLSchema#string\"}]}"但是，如果尝试使用Newtonsoft对该字符串进行反序列化，如下所示：
JsonConvert.DeserializeObject<ApiKey>(serialized_key);我得到以下错误：
Newtonsoft.Json.JsonSerializationException: Unable to find a constructor to use for type System.Security.Claims.Claim. A class should either have a default constructor, one constructor with arguments or a constructor marked with the JsonConstructor attribute. Path 'Claims[0].Issuer', line 1, position 83.
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewObject(JsonReader reader, JsonObjectContract objectContract, JsonProperty containerMember, JsonProperty containerProperty, String id, Boolean& createdFromNonDefaultCreator)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ResolvePropertyAndCreatorValues(JsonObjectContract contract, JsonProperty containerProperty, JsonReader reader, Type objectType)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObjectUsingCreatorWithParameters(JsonReader reader, JsonObjectContract contract, JsonProperty containerProperty, ObjectConstructor`1 creator, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)当我希望取回原来的对象时，我首先序列化了它。为了能够反序列化这个对象，我遗漏了什么？
谢谢!
编辑:索赔对象来自System.Security.Claims.Claim。
编辑2:我希望能够序列化/反序列化整个ApiKey类，而不仅仅是声明部分。
编辑3:我不能修改ApiKey类。
回答 2
Stack Overflow用户
回答已采纳
发布于 2020-08-28 22:01:00
你必须编写一个自定义的转换器，在这个答案中有一个Claim类的例子：https://stackoverflow.com/a/28155770/6881299
Stack Overflow用户
发布于 2020-08-28 21:29:37
问题是Claim类没有任何公共构造函数。最简单的解决方法是创建您自己的声明类并将其反序列化：
class MyClaim : Claim {
public MyClaim(string type, string value, string valueType, string issuer, string originalIssuer):
base(type, value, valueType, issuer, originalIssuer){}
}
Claim claim = JsonConvert.DeserializeObject<MyClaim>(json);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/63634652
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