/// <summary>/// 扩展自DefaultHttpControllerSelector类的控制器选择器，目前在用/// </summary>public class ZhuSirNamespaceHttpControllerSelector : DefaultHttpControllerSelector{private const string NamespaceRouteVariableName = "namespaces";private readonly HttpConfiguration _configuration;private readonly Lazy<ConcurrentDictionary<string, Type>> _apiControllerCache;public ZhuSirNamespaceHttpControllerSelector(HttpConfiguration configuration): base(configuration){_configuration = configuration;_apiControllerCache = new Lazy<ConcurrentDictionary<string, Type>>(new Func<ConcurrentDictionary<string, Type>>(InitializeApiControllerCache));}private ConcurrentDictionary<string, Type> InitializeApiControllerCache(){IAssembliesResolver assembliesResolver = this._configuration.Services.GetAssembliesResolver();var types = this._configuration.Services.GetHttpControllerTypeResolver().GetControllerTypes(assembliesResolver).ToDictionary(t => t.FullName, t => t);return new ConcurrentDictionary<string, Type>(types);}public IEnumerable<string> GetControllerFullName(HttpRequestMessage request, string controllerName){object namespaceName;var data = request.GetRouteData();IEnumerable<string> keys = _apiControllerCache.Value.ToDictionary<KeyValuePair<string, Type>, string, Type>(t => t.Key,t => t.Value, StringComparer.CurrentCultureIgnoreCase).Keys.ToList();if (!data.Values.TryGetValue(NamespaceRouteVariableName, out namespaceName)){return from k in keyswhere k.EndsWith(string.Format(".{0}{1}", controllerName,DefaultHttpControllerSelector.ControllerSuffix), StringComparison.CurrentCultureIgnoreCase)select k;}string[] namespaces = (string[])namespaceName;return from n in namespacesjoin k in keys on string.Format("{0}.{1}{2}", n, controllerName,DefaultHttpControllerSelector.ControllerSuffix).ToLower() equals k.ToLower()select k;}public override HttpControllerDescriptor SelectController(HttpRequestMessage request){Type type;if (request == null){throw new ArgumentNullException("request");}string controllerName = this.GetControllerName(request);if (string.IsNullOrEmpty(controllerName)){throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,string.Format("无法通过API路由匹配到您所请求的URI '{0}'",new object[] { request.RequestUri })));}IEnumerable<string> fullNames = GetControllerFullName(request, controllerName);if (fullNames.Count() == 0){throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,string.Format("无法通过API路由匹配到您所请求的URI '{0}'",new object[] { request.RequestUri })));}if (this._apiControllerCache.Value.TryGetValue(fullNames.First(), out type)){return new HttpControllerDescriptor(_configuration, controllerName, type);}throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,string.Format("无法通过API路由匹配到您所请求的URI '{0}'",new object[] { request.RequestUri })));}}

   第二步，需要我们配置WebAPI路由设置，添加{ namespaces }片段变量，同时也可以直接为其设置默认值，然后替换掉原MVC框架中的DefaultHttpControllerSelector选额器为我们之前扩展的ZhuSirNamespaceHttpControllerSelector选额器。这里需要注意片段变量的变量名namespaces一定要与我们ZhuSirNamespaceHttpControllerSelector中定义的NamespaceRouteVariableName字符串常量的值一致。下面贴出WebApiConfig的源码:

public static class WebApiConfig{public static void Register(HttpConfiguration config){//配置检查Api控制后缀为ApiController//var suffix = typeof(MicrosoftNamespaceHttpControllerSelector)//    .GetField("ControllerSuffix", BindingFlags.Static | BindingFlags.Public);//if (suffix != null)//{//    suffix.SetValue(null, "ApiController");//}// Web API 配置和服务// 将 Web API 配置为仅使用不记名令牌身份验证。config.SuppressDefaultHostAuthentication();config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));// 对 JSON 数据使用混合大小写。config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();// Web API 路由config.MapHttpAttributeRoutes();config.Routes.MapHttpRoute(name: "DefaultApi",routeTemplate: "api/{controller}/{id}/{namespaces}",defaults: new { id = RouteParameter.Optional ,namespaces = new[] { "ZhuSir.HMS.WebApi.ApiControllers" }  });config.Services.Replace(typeof(IHttpControllerSelector), new ZhuSirNamespaceHttpControllerSelector(config));}}

namespace ZhuSir.HMS.WebApi.ApiControllers
{public class TestApiController : ApiController{[HttpGet]public string Gettest(){return "测试数据";}}
}

作者：smallprogram

出处：http://www.cnblogs.com/smallprogram/p/5673066.html

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