C# 如何在 MVC 4 Web API 中为 Json.NET 设置自定义 JsonSerializerSettings？
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How to set custom JsonSerializerSettings for Json.NET in MVC 4 Web API?
提问by Richard Neil Ilagan
I understand that ASP.NET Web API natively uses Json.NET for (de)serializing objects, but is there a way to specify a JsonSerializerSettingsobject that you want for it to use?
我知道 ASP.NET Web API 本机使用 Json.NET 来（反）序列化对象，但是有没有办法指定JsonSerializerSettings您希望它使用的对象？
For example, what if I wanted to include typeinformation into the serialized JSON string? Normally I'd inject settings into the .Serialize()call, but Web API does that silently. I can't find a way to inject settings manually.
例如，如果我想type在序列化的 JSON 字符串中包含信息怎么办？通常我会在.Serialize()调用中注入设置，但 Web API 会默默地做到这一点。我找不到手动注入设置的方法。
采纳答案by carlosfigueira
You can customize the JsonSerializerSettingsby using the Formatters.JsonFormatter.SerializerSettingsproperty in the HttpConfigurationobject.
您可以JsonSerializerSettings使用对象中的Formatters.JsonFormatter.SerializerSettings属性自定义HttpConfiguration。
For example, you could do that in the Application_Start() method:
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;
}
回答by smockle
You can specify JsonSerializerSettingsfor each JsonConvert, and you can set a global default.
您可以JsonSerializerSettings为每个指定JsonConvert，并且可以设置全局默认值。
Single JsonConvertwith an overload:
SingleJsonConvert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
}
);
Global Settingwith code in Application_Start()in Global.asax.cs:
Application_Start()在 Global.asax.cs 中使用代码进行全局设置：
JsonConvert.DefaultSettings = () => new JsonSerializerSettings {
Formatting = Newtonsoft.Json.Formatting.Indented,
ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
};
Reference: https://github.com/JamesNK/Newtonsoft.Json/issues/78
回答by AEMLoviji
Answer is adding this 2 lines of code to Global.asax.cs Application_Start method
答案是将这 2 行代码添加到 Global.asax.cs Application_Start 方法
var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
json.SerializerSettings.PreserveReferencesHandling =
Newtonsoft.Json.PreserveReferencesHandling.All;
Reference: Handling Circular Object References
参考：处理循环对象引用
