c#之JSON.NET MVC 4 WebApi

我正在创建Controller以返回JSON格式的对象。
我想使用Newtonsoft.Json库。
我创建了两种方法：

[HttpGet] 
[ActionName("RetrieveTestClassJson")] 
public ActionResult RetrieveTestClassJson(int id) 
{ 
    TestThing testThing = new TestThing() { Name = "LPL.22.334", Type = TypeTest.Component }; 
    JsonNetResult jsonNetResult = new JsonNetResult(); 
    jsonNetResult.Formatting = Formatting.Indented; 
    jsonNetResult.ContentType = "application/json"; 
    jsonNetResult.ContentEncoding = Encoding.Unicode; 
    jsonNetResult.Data = testThing; 
    return jsonNetResult; 
} 
 
[HttpGet] 
[ActionName("RetrieveTestClassCase2")] 
public TestThing RetrieveTestClassCase2(int id) 
{ 
    TestThing testThing = new TestThing() { Name = "LPL.22.334", Type = TypeTest.Component }; 
    return testThing; 
} 

当我从ajax或浏览器URL调用RetrieveTestClassJson时，我得到：

{"ContentEncoding":{"isThrowException":false,"bigEndian":false,"byteOrderMark":true,"m_codePage":1200,"dataItem":null,"encoderFallback":{"strDefault":"�","bIsMicrosoftBestFitFallback":false},"decoderFallback":{"strDefault":"�","bIsMicrosoftBestFitFallback":false},"m_isReadOnly":true},"ContentType":"application/json","Data":{"Name":"LPL.22.334"},"SerializerSettings":{"ReferenceLoopHandling":0,"MissingMemberHandling":0,"ObjectCreationHandling":0,"NullValueHandling":0,"DefaultValueHandling":0,"Converters":[{"CamelCaseText":true,"CanRead":true,"CanWrite":true}],"PreserveReferencesHandling":0,"TypeNameHandling":0,"TypeNameAssemblyFormat":0,"ConstructorHandling":0,"ContractResolver":null,"ReferenceResolver":null,"TraceWriter":null,"Binder":null,"Error":null,"Context":{"m_additionalContext":null,"m_state":0},"DateFormatString":"yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFFK","MaxDepth":null,"Formatting":0,"DateFormatHandling":0,"DateTimeZoneHandling":3,"DateParseHandling":1,"FloatFormatHandling":0,"FloatParseHandling":0,"StringEscapeHandling":0,"Culture":"(Default)","CheckAdditionalContent":false},"Formatting":1} 

当我调用RetrieveTestClassCase2时，我得到了普通的JSON格式。
我现在出于测试目的删除了xml处理程序：

var appXmlType = config.Formatters.XmlFormatter.SupportedMediaTypes.FirstOrDefault(t => t.MediaType == "application/xml"); 
config.Formatters.XmlFormatter.SupportedMediaTypes.Remove(appXmlType); 

我对发生的事情感到困惑。

请您参考如下方法:

WebApi已经在管道中使用了Json序列化程序http://www.asp.net/web-api/overview/formats-and-model-binding/json-and-xml-serialization，因此我认为在您显式进行序列化的方法中，结果最终被序列化了两次。第二种方法是您想要的，除非您也删除了json格式器。