1.控制只返回JSON一种数据

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; } }

使用：在WebApiConfig.cs中

public static void Register(HttpConfiguration config) { config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{action}", defaults: new { id = RouteParameter.Optional } ); // 取消注释下面的代码行可对具有 IQueryable 或 IQueryable<T> 返回类型的操作启用查询支持。 // 若要避免处理意外查询或恶意查询，请使用 QueryableAttribute 上的验证设置来验证传入查询。 // 有关详细信息，请访问 ?LinkId=279712。 //config.EnableQuerySupport(); // 若要在应用程序中禁用跟踪，请注释掉或删除以下代码行 // 有关详细信息，，请参阅: config.EnableSystemDiagnosticsTracing(); var jsonFormatter = new JsonMediaTypeFormatter(); //optional: set serializer settings here config.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter)); }

2.支持跨域POST,网上很多都是.net 4.5的，找了好久才找到.net 4.0的方法

public class CorsHandler : DelegatingHandler { const string Origin = "Origin"; const string AccessControlRequestMethod = "Access-Control-Request-Method"; const string AccessControlRequestHeaders = "Access-Control-Request-Headers"; const string AccessControlAllowOrigin = "Access-Control-Allow-Origin"; const string AccessControlAllowMethods = "Access-Control-Allow-Methods"; const string AccessControlAllowHeaders = "Access-Control-Allow-Headers"; protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { bool isCorsRequest = request.Headers.Contains(Origin); bool isPreflightRequest = request.Method == HttpMethod.Options; if (isCorsRequest) { if (isPreflightRequest) { return Task.Factory.StartNew<HttpResponseMessage>(() => { HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK); response.Headers.Add(AccessControlAllowOrigin, request.Headers.GetValues(Origin).First()); string accessControlRequestMethod = request.Headers.GetValues(AccessControlRequestMethod).FirstOrDefault(); if (accessControlRequestMethod != null) { response.Headers.Add(AccessControlAllowMethods, accessControlRequestMethod); } string requestedHeaders = string.Join(", ", request.Headers.GetValues(AccessControlRequestHeaders)); if (!string.IsNullOrEmpty(requestedHeaders)) { response.Headers.Add(AccessControlAllowHeaders, requestedHeaders); } return response; }, cancellationToken); } else { return base.SendAsync(request, cancellationToken).ContinueWith<HttpResponseMessage>(t => { HttpResponseMessage resp = t.Result; resp.Headers.Add(AccessControlAllowOrigin, request.Headers.GetValues(Origin).First()); return resp; }); } } else { return base.SendAsync(request, cancellationToken); } } }

使用：在Global.asax中