反序列化JSON不JSON.NET工作 [英] Deserialize JSON not working with JSON.NET
问题描述
使用JSON.NET反序列化时，我有以下JSON的一个问题。
I have a problem with the following JSON when deserializing using JSON.NET.
{
"?xml": {
"@version": "1.0",
"@encoding": "utf-8"
},
"Persons": {
"Person": [{
"@Id": "1",
"@Name": "John",
"@Surname": "Smith"
},
{
"@Id": "2",
"@Name": "John",
"@Surname": "Smith",
"Skills": {
"Skill": [{
"@Id": "1",
"@Name": "Developer"
},
{
"@Id": "2",
"@Name": "Tester"
}]
}
}]
}
}
我用下面的类：
public class RootObject
{
public Xml xml { get; set; }
public Persons Persons { get; set; }
}
public class Xml
{
public string version { get; set; }
public string encoding { get; set; }
}
public class Persons
{
public List<Person> Person { get; set; }
}
public class Skill
{
public int Id { get; set; }
public string Name { get; set; }
}
public class Skills
{
public List<Skill> Skill { get; set; }
}
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public string Surname { get; set; }
public Skills Skills { get; set; }
}
当我尝试反序列化
RootObject persons = JsonConvert.DeserializeObject<RootObject>(json);
我得到了以下错误：
i got the following error:
无法反序列化当前的JSON对象（如{名：值}）
到类型为
'System.Collections.Generic.List`1 [Project.Models。 Persons.Skill]'
，因为该类型需要一个JSON数组（如[1,2,3]），以正确的反序列化
。要解决这个错误要么改变的JSON到一个JSON数组
（例如：[1,2,3]）或改变反序列化的类型，以便它是一个正常的
.NET类型（例如，不是原始类型喜欢整数，而不是一个集合
型一样，可以从一个JSON
对象进行反序列化数组或列表）。 JsonObjectAttribute也可以加入，迫使它
从JSON对象反序列化的类型。
Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Project.Models.Persons.Skill]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly. To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
我想这个问题是在符号：
I suppose the problem is in the notation:
"Skills": {
"Skill": [{
我在想什么，有一个简单的解决这个问题？
What am I missing, is there an easy solution to this problem?
更新：
所以最后的问题是，它有时一个JSON数组
So finally the problem was that it was sometimes a JSON array
"Skills": {
"Skill": [{
有时一个JSON对象
"Skills": {
"Skill": {
但粘贴时/检查我的代码放到它总是被格式化为一个JSON数组验证，所以我已经检查它使用监视窗口看到原始的JSON字符串。
But when pasting/checking my code into validators it would always be formatted as a JSON array so i've inspected it using watch window to see the raw json string.
从那里很容易标记一个JsonConverter属性的属性。
From there it was easy to mark the property with a JsonConverter attribute
public class Skills
{
[JsonConverter(typeof(MyConverter))]
public List<Skill> Skill { get; set; }
}
和编写转换器：
public class MyConverter : JsonConverter
{
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.StartArray)
{
return serializer.Deserialize<List<Skill>>(reader);
}
else
{
Skill skill = serializer.Deserialize<Skill>(reader);
return new List<Skill>(new[] { skill});
}
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
writer.WriteValue(value);
}
}
希望它可以帮助别人。
Hope it helps somebody.
推荐答案
我认为，与当前的JSON，你所描述的技能包含集合，而不是技能。试试这个JSON来代替：
I think, with your current JSON, you are describing that Skill contains a collection, not Skills. Try this JSON instead:
"Skills": [
{
"@Id": "1",
"@Name": "Developer"
},
{
"@Id": "2",
"@Name": "Tester"
}
]
同样的道理也适用于你是如何定义的< 。code>人集
The same thing applies to how you are defining the Persons collection.
编辑：
本测试通过对我来说：
[TestFixture]
public class JSONTester
{
[Test]
public void Json_deserialize()
{
var json = @"{
""?xml"": {
""@version"": ""1.0"",
""@encoding"": ""utf-8""
},
""Persons"": {
""Person"": [{
""@Id"": ""1"",
""@Name"": ""John"",
""@Surname"": ""Smith""
},
{
""@Id"": ""2"",
""@Name"": ""John"",
""@Surname"": ""Smith"",
""Skills"": {
""Skill"": [{
""@Id"": ""1"",
""@Name"": ""Developer""
},
{
""@Id"": ""2"",
""@Name"": ""Tester""
}]
}
}]
}
}";
var persons = JsonConvert.DeserializeObject<RootObject>(json);
Assert.AreEqual(persons.Persons.Person[1].Skills.Skill.Count, 2);
}
public class RootObject
{
public Xml xml { get; set; }
public Persons Persons { get; set; }
}
public class Xml
{
public string version { get; set; }
public string encoding { get; set; }
}
public class Persons
{
public List<Person> Person { get; set; }
}
public class Skill
{
public int Id { get; set; }
public string Name { get; set; }
}
public class Skills
{
public List<Skill> Skill { get; set; }
}
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public string Surname { get; set; }
public Skills Skills { get; set; }
}
}
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