我想用这些URL到达Bikes控制器：
/bikes // (default path for US) /ca/bikes // (path for Canada)
实现这一目标的一种方法是每个Action使用多个Route属性：
[Route("bikes")]
[Route("{country}/bikes")]
public ActionResult Index()
为了保持DRY,我更喜欢使用RoutePrefix,但不允许使用多个路由前缀：
[RoutePrefix("bikes")]
[RoutePrefix("{country}/bikes")] // <-- Error: Duplicate 'RoutePrefix' attribute
public class BikesController : BaseController
[Route("")]
public ActionResult Index()
我试过使用这个Route Prefix：
[RoutePrefix("{country}/bikes")]
public class BikesController : BaseController
结果：/ ca / bikes工作,/自行车404s.
我试过让国家选择：
[RoutePrefix("{country?}/bikes")]
public class BikesController : BaseController
相同的结果：/ ca / bikes工作,/自行车404s.
我试过给国家一个默认值：
[RoutePrefix("{country=us}/bikes")]
public class BikesController : BaseController
相同的结果：/ ca / bikes工作,/自行车404s.
有没有其他方法可以使用属性路由实现我的目标？
(是的,我知道我可以通过在RouteConfig.cs中注册路由来完成这些工作,但这不是我在这里寻找的东西).
我正在使用Microsoft.AspNet.Mvc 5.2.2.
仅供参考：这些是简化示例 – 实际代码具有{country}值的IRouteConstraint,例如：
[Route("{country:countrycode}/bikes")]
解决方法
我参加聚会有点晚了,但我有一个解决这个问题的工作方案.请在这个问题
here找到我的详细博客文章
我在下面写下摘要
您需要创建2个文件,如下所示
> _3bTechTalkMultiplePrefixDirectRouteProvider.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Web.Http.Controllers;
using System.Web.Http.Routing;
namespace _3bTechTalk.MultipleRoutePrefixAttributes {
public class _3bTechTalkMultiplePrefixDirectRouteProvider: DefaultDirectRouteProvider {
protected override IReadOnlyList GetActionDirectRoutes(HttpActionDescriptor actionDescriptor,IReadOnlyList factories,IInlineConstraintResolver constraintResolver) {
return CreateRouteEntries(GetRoutePrefixes(actionDescriptor.ControllerDescriptor),factories,new [] {
actionDescriptor
},constraintResolver,true);
}
protected override IReadOnlyList GetControllerDirectRoutes(HttpControllerDescriptor controllerDescriptor,IReadOnlyList actionDescriptors,IInlineConstraintResolver constraintResolver) {
return CreateRouteEntries(GetRoutePrefixes(controllerDescriptor),actionDescriptors,false);
}
private IEnumerable GetRoutePrefixes(HttpControllerDescriptor controllerDescriptor) {
Collection attributes = controllerDescriptor.GetCustomAttributes (false);
if (attributes == null)
return new string[] {
null
};
var prefixes = new List ();
foreach(var attribute in attributes) {
if (attribute == null)
continue;
string prefix = attribute.Prefix;
if (prefix == null)
throw new InvalidOperationException("Prefix can not be null. Controller: " + controllerDescriptor.ControllerType.FullName);
if (prefix.EndsWith("/",StringComparison.Ordinal))
throw new InvalidOperationException("Invalid prefix" + prefix + " in " + controllerDescriptor.ControllerName);
prefixes.Add(prefix);
}
if (prefixes.Count == 0)
prefixes.Add(null);
return prefixes;
}
private IReadOnlyList CreateRouteEntries(IEnumerable prefixes,IReadOnlyCollection factories,IReadOnlyCollection actions,IInlineConstraintResolver constraintResolver,bool targetIsAction) {
var entries = new List ();
foreach(var prefix in prefixes) {
foreach(IDirectRouteFactory factory in factories) {
RouteEntry entry = CreateRouteEntry(prefix,factory,actions,targetIsAction);
entries.Add(entry);
}
}
return entries;
}
private static RouteEntry CreateRouteEntry(string prefix,IDirectRouteFactory factory,bool targetIsAction) {
DirectRouteFactoryContext context = new DirectRouteFactoryContext(prefix,targetIsAction);
RouteEntry entry = factory.CreateRoute(context);
ValidateRouteEntry(entry);
return entry;
}
private static void ValidateRouteEntry(RouteEntry routeEntry) {
if (routeEntry == null)
throw new ArgumentNullException("routeEntry");
var route = routeEntry.Route;
if (route.Handler != null)
throw new InvalidOperationException("Direct route handler is not supported");
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
namespace _3bTechTalk.MultipleRoutePrefixAttributes
{
[AttributeUsage(AttributeTargets.Class,AllowMultiple = true,Inherited = true)]
public class _3bTechTalkRoutePrefix : RoutePrefixAttribute
{
public int Order { get; set; }
public _3bTechTalkRoutePrefix(string prefix) : this(prefix,0) { }
public _3bTechTalkRoutePrefix(string prefix,int order) : base(prefix)
{
Order = order;
}
}
}
完成后,打开WebApiConfig.cs并在给定行下面添加此项
config.MapHttpAttributeRoutes(new _3bTechTalkMultiplePrefixDirectRouteProvider());
就是这样,现在您可以在controller中添加多个路由前缀.示例如下
[_3bTechTalkRoutePrefix("api/Car",Order = 1)]
[_3bTechTalkRoutePrefix("{CountryCode}/api/Car",Order = 2)]
public class CarController: ApiController {
[Route("Get")]
public IHttpActionResult Get() {
return Ok(new {
Id = 1,Name = "Honda Accord"
});
}
}
快乐编码:)
