将JSON对象反序列化为嵌套的C#对象 [英] Deserialize JSON object into nested C# object
问题描述
编辑:我想我应该提到我无法控制JSON,而且我知道通常我的C#对象应该与JSON匹配.我的问题不是为什么不反序列化?".我知道为什么不是这样.我在问是否有一种方法可以按照我的要求反序列化JSON.
Edit: I guess I should mention that I do not have control over the JSON and I know that typically my C# object should match the JSON. My question wasn't "why isn't this deserializing?". I know why it's not. I am asking if there is a way to deserialize the JSON the way that I am asking.
我正在使用Newtonsoft.Json.
I am using Newtonsoft.Json.
我有一个包含1个对象的JSON字符串.我需要将该对象反序列化为带有嵌套对象的C#对象.
I have a JSON string containing 1 object. I need to deserialize that object into a C# object with a nested object.
所以可以说我的JSON看起来像这样.
So lets say my JSON looks like this.
{
"id": 123,
"userName": "fflintstone",
"address": "345 Cave Stone Road",
"address2": "",
"city": "Bedrock",
"state": "AZ",
"zip": "",
}
这是我的C#对象
public class Customer
{
public long Id { get; set; }
public string UserName { get; set; }
public AddressModel Address { get; set; }
}
AddressModel地址属性是一个嵌套对象.该对象包含实际的地址属性.因此,我需要反序列化JSON对象,以便将id和userName添加到Customer对象,然后将地址字段添加到嵌套的Address对象.
The AddressModel Address property is a nested object. That object contains the actual address properties. So I need to deserialze my JSON object so that id and userName are added to the Customer object and then the address fields are added to the nested Address object.
我无法找到newtonsoft内置的方法来实现此目的.有什么想法吗?
I haven't been able to find a way that is built into newtonsoft to accomplish this. Any ideas?
推荐答案
您可以使用自定义JsonConverter进行此操作.
You can do this using a custom JsonConverter.
public class CustomerJsonConverter : JsonConverter
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value is Customer customer)
{
var token = new JObject
{
["id"] = customer.Id,
["userName"] = customer.UserName,
["address"] = customer.Address.Address,
["address2"] = customer.Address.Address2,
["city"] = customer.Address.City,
["state"] = customer.Address.State,
["zip"] = customer.Address.ZIP
};
token.WriteTo(writer);
}
else
{
throw new InvalidOperationException();
}
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var obj = JToken.ReadFrom(reader);
if (obj.Type != JTokenType.Object)
{
return null;
}
return new Customer
{
Id = (long) obj["id"],
UserName = (string) obj["userName"],
Address = obj.ToObject<AddressModel>()
};
}
public override bool CanRead => true;
public override bool CanConvert(Type objectType)
{
return objectType == typeof(Customer);
}
}
在 Customer
类上带有 JsonConverterAttribute
.
[JsonConverter(typeof(CustomerJsonConverter))]
public class Customer
{
public long Id { get; set; }
public string UserName { get; set; }
public AddressModel Address { get; set; }
}
public class AddressModel
{
public string Address { get; set; }
public string Address2 { get; set; }
public string City { get; set; }
public string State { get; set; }
public string ZIP { get; set; }
}
并这样利用:
var customer = JsonConvert.DeserializeObject<Customer>(customerJson);
或者,您可以简单地使用一个中间映射模型.
alternatively, you could simply have an intermediate mapping model.
public class CustomerFlattened
{
public long Id { get; set; }
public string UserName { get; set; }
public string Address { get; set; }
public string Address2 { get; set; }
public string City { get; set; }
public string State { get; set; }
public string ZIP { get; set; }
public Customer ToCustomer()
{
return new Customer
{
Id = Id,
UserName = UserName,
Address = new AddressModel
{
Address = Address,
Address2 = Address2,
City = City,
State = State,
ZIP = ZIP
}
};
}
public static CustomerFlattened FromCustomer(Customer customer)
{
return new CustomerFlattened
{
Id = customer.Id,
UserName = customer.UserName,
Address = customer.Address.Address,
Address2 = customer.Address.Address2,
City = customer.Address.City,
State = customer.Address.State,
ZIP = customer.Address.ZIP
};
}
}
并这样利用:
var customer =
JsonConvert.Deserialize<CustomerFlattened>(
jsonOriginal
)
.ToCustomer();
var customerFlattened = CustomerFlattened.FromCustomer(customer);
var jsonConverted = JsonConvert.Serialize(customerFlattened );
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