MVC4.0 WebApi如何设置api支持namespace

/// <summary>
/// 设置api支持namespace
/// </summary>
public class NamespaceHttpControllerSelector : DefaultHttpControllerSelector
{
private const string NamespaceRouteVariableName = "namespace_name";
private readonly HttpConfiguration _configuration;
private readonly Lazy<ConcurrentDictionary<string, Type>> _apiControllerCache;

public NamespaceHttpControllerSelector(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 keys
where k.EndsWith(string.Format(".{0}{1}", controllerName,
DefaultHttpControllerSelector.ControllerSuffix), StringComparison.CurrentCultureIgnoreCase)
select k;
}

string[] namespaces = (string[])namespaceName;
return from n in namespaces
join 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("No route providing a controller name was found to match request 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("No route providing a controller name was found to match request 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("No route providing a controller name was found to match request URI '{0}'", new object[] { request.RequestUri })));
}
}

public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
//注册支持namespace的HttpControllerSelector，替换默认DefaultHttpControllerSelector
config.Services.Replace(typeof(IHttpControllerSelector), new NamespaceHttpControllerSelector(GlobalConfiguration.Configuration));

config.Routes.MapHttpRoute(
name: "Phone",
routeTemplate: "api/phone/{controller}/{action}/{id}",
defaults: new
{
id = RouteParameter.Optional,
namespace_name = new string[] { "Amy.WebUI.Api.Phone" }
}
);

config.Routes.MapHttpRoute(
name: "ApiDefault",
routeTemplate: "api/{controller}/{action}/{id}",
defaults: new
{
id = RouteParameter.Optional,
namespace_name = new string[] { "Amy.WebUI.Api" }
}
);
}
}