如何在MVC 4 Web API中为Json.NET设置自定义JsonSerializerSettings？

Question

我知道ASP.NET Web API本身使用Json.NET来(反)序列化对象,但有没有办法指定JsonSerializerSettings你想要它使用的对象？

例如,如果我想将type信息包含在序列化的JSON字符串中该怎么办？通常我会在.Serialize()调用中注入设置,但Web API会默默地执行此操作.我找不到手动注入设置的方法.

Answer 1

您可以JsonSerializerSettings使用对象中的Formatters.JsonFormatter.SerializerSettings属性自定义HttpConfiguration.

例如,您可以在Application_Start()方法中执行此操作:

protected void Application_Start()
{
    HttpConfiguration config = GlobalConfiguration.Configuration;
    config.Formatters.JsonFormatter.SerializerSettings.Formatting =
        Newtonsoft.Json.Formatting.Indented;
}

Answer 2

您可以JsonSerializerSettings为每个指定JsonConvert,并且可以设置全局默认值.

单人JsonConvert过载:

// Option #1.
JsonSerializerSettings config = new JsonSerializerSettings { ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore };
this.json = JsonConvert.SerializeObject(YourObject, Formatting.Indented, config);

// Option #2 (inline).
JsonConvert.SerializeObject(YourObject, Formatting.Indented,
    new JsonSerializerSettings() {
        ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
    }
);

Application_Start()Global.asax.cs中代码的全局设置:

JsonConvert.DefaultSettings = () => new JsonSerializerSettings {
     Formatting = Newtonsoft.Json.Formatting.Indented,
     ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
};

参考:https://github.com/JamesNK/Newtonsoft.Json/issues/78