. Net MVC 4 Web Api output JSON format

1. Add JSON output in Global

GLOBALCONFIGURATION.CONFIGURATION.FORMATTERS.JSONFORMATTER.MEDIATYPEMAPPINGS.ADD (New querystringmapping ("JSON", "True", "Application/json"));

protected void Application_Start () {     arearegistration.registerallareas ();     Add JSON parsing  using method Http://xxx/api/action?json=true     GLOBALCONFIGURATION.CONFIGURATION.FORMATTERS.JSONFORMATTER.MEDIATYPEMAPPINGS.ADD (New querystringmapping ("JSON", "True", "Application/json"));     Webapiconfig.register (globalconfiguration.configuration);     Filterconfig.registerglobalfilters (globalfilters.filters);     Routeconfig.registerroutes (routetable.routes);     Bundleconfig.registerbundles (Bundletable.bundles); }

2. Delete XML parsing in Global

GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear ();

protected void Application_Start () {     arearegistration.registerallareas ();     Webapiconfig.register (globalconfiguration.configuration);     Filterconfig.registerglobalfilters (globalfilters.filters);     Routeconfig.registerroutes (routetable.routes);     Bundleconfig.registerbundles (bundletable.bundles);     Remove parsing of XML when the return value is string, return string is not a JSON object     directly GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear ();  }

3. Specify return format

New method requires assembly: System.Web.Extensions public static httpresponsemessage ToJson (Object obj) {     String str;     if (obj is a String | | obj is Char)     {         str = obj. ToString ();     }     else     {         var serializer = new JavaScriptSerializer ();         str = serializer. Serialize (obj);     }     var result = new Httpresponsemessage {Content = new stringcontent (str, encoding.getencoding ("UTF-8"), "Application/json" ) };     return result; }

Convert user method to JSON object output

Public Httpresponsemessage GetString (string name) {     return ToJson (name);}

4. Overriding the default implementation class all output will be re-parsed into JSON

New Jsoncontentnegotiator class public class Jsoncontentnegotiator:icontentnegotiator {     private readonly Jsonmediatypeformatter _jsonformatter;     Public Jsoncontentnegotiator (Jsonmediatypeformatter formatter)     {         _jsonformatter = formatter;     }      Public contentnegotiationresult Negotiate (type type, httprequestmessage request, Ienumerable<mediatypeformatter > formatters)     {         var result = new Contentnegotiationresult (_jsonformatter, New Mediatypeheadervalue (" Application/json "));         return result;     } }

Webapiconfig is used in the override public static void Register (Httpconfiguration config) {     config. Routes.maphttproute (         name: "Defaultapi",         routetemplate: "Api/{controller}/{id}",         defaults:new {id = Routeparameter.optional}     );      var jsonformatter = new Jsonmediatypeformatter ();     Config. Services.replace (typeof (Icontentnegotiator), New Jsoncontentnegotiator (Jsonformatter));      Uncomment the following line of code to enable query support for operations that have a IQueryable or iqueryable<t> return type.     //To avoid handling unexpected queries or malicious queries, use the validation settings on Queryableattribute to validate incoming queries.     //For more information, please visit http://go.microsoft.com/fwlink/?LinkId=279712.     //config. Enablequerysupport ();      To disable tracing in the application, comment out or remove the following line of code     //For more information, see: Http://www.asp.net/web-api     config. Enablesystemdiagnosticstracing (); }

. Net MVC 4 Web Api output JSON format