在C＃中覆盖Json属性名称

Question

我有一堂课，有以下领域。这些属性用于在需要调用外部rest API方法时序列化为json对象。

public class Customer
    {
        [JsonProperty(PropertyName = "email")]
        public string Email { get; set; }

        [JsonProperty(PropertyName = "prop[listId]")]
        public string Test{ get; set; }

        // there are lot of properties 
    }

在属性名称中Test，外部API服务调用需要一些类似json归档名称格式的内容。

prop[7]

就我而言，这7可以根据诸如test，dev和prod之类的环境进行更改。因此，我正在寻找一种将listId值移动到app.config中的方法。

我尝试按照以下方式进行操作，但不允许这样做。listIdValue如果分配常数值，它将起作用。

     private string listIdValue = ConfigurationManager.AppSettings["ListIdValue"];

     [JsonProperty(PropertyName = "prop["+listIdValue +"]")]
     public string Test{ get; set; }

Answer 1

您必须重写DefaultContractResolver并实现自己的机制来提供PropertyName（以JSON格式）。我将提供完整的示例代码，以显示生成的运行时的反序列化和序列化PropertyName。当前，它将Test字段修改为Test5（在所有模型中）。您应该实现自己的机制（使用属性，保留名称，表等）。

class Program
{
    static void Main(string[] args)
    {
        var customer = new Customer() {Email = "[e-mail]", Test = "asdasd"};
        var a = Serialize(customer, false);
        var b = Serialize(customer, true);
        Console.WriteLine(a);
        Console.WriteLine(b);

        var desA = Deserialize<Customer>(a, false);
        var desB = Deserialize<Customer>(b, true);

        Console.WriteLine("TestA: {0}", desA.Test);
        Console.WriteLine("TestB: {0}", desB.Test);

    }

    static string Serialize(object obj, bool newNames)
    {
        JsonSerializerSettings settings = new JsonSerializerSettings();
        settings.Formatting = Formatting.Indented;
        if (newNames)
        {
            settings.ContractResolver = new CustomNamesContractResolver();
        }

        return JsonConvert.SerializeObject(obj, settings);
    }
    static T Deserialize<T>(string text, bool newNames)
    {
        JsonSerializerSettings settings = new JsonSerializerSettings();
        settings.Formatting = Formatting.Indented;
        if (newNames)
        {
            settings.ContractResolver = new CustomNamesContractResolver();
        }

        return JsonConvert.DeserializeObject<T>(text, settings);
    }
}
class CustomNamesContractResolver : DefaultContractResolver
{
    protected override IList<JsonProperty> CreateProperties(System.Type type, MemberSerialization memberSerialization)
    {
        // Let the base class create all the JsonProperties 
        // using the short names
        IList<JsonProperty> list = base.CreateProperties(type, memberSerialization);

        // Now inspect each property and replace the 
        // short name with the real property name
        foreach (JsonProperty prop in list)
        {
            if (prop.UnderlyingName == "Test") //change this to your implementation!
                prop.PropertyName = "Test" + 5;

        }

        return list;
    }
}

public class Customer
{
    [JsonProperty(PropertyName = "email")]
    public string Email { get; set; }

    public string Test { get; set; }

}

输出：

{
  "email": "[e-mail]",
  "Test": "asdasd"
}
{
  "email": "[e-mail]",
  "Test5": "asdasd"
}
TestA: asdasd
TestB: asdasd

如您所见，按预期，当我们使用Serialize(..., false)-字段名称为时，Test以及当我们使用Serialize(..., true)-字段名称Test5为时。这也适用于反序列化。