在 web api 路由中,我创建了以下路由和路由处理程序。
我试图拦截请求并在它到达实际方法之前更改一些路由数据。
但是下面的代码并没有像我预期的那样工作,当运行并向 api 发出请求时,它返回 404 没有找到提供 Controller 名称匹配请求的路由
。
这真的可以改变路线数据吗?我觉得我接近解决方案但遗漏了一些东西。
下面是我的代码:
public class CustomHander : DelegatingHandler {
protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) {
var routeData = request.GetRouteData();
var subroutes = (IEnumerable<IHttpRouteData>)routeData.Values["MS_SubRoutes"];
var route = subroutes.First();
var msSubRoutes = new HttpRouteValueDictionary();
var httpRouteData = new HttpRouteData(route.Route);
foreach (var r in route.Values) {
httpRouteData.Values.Add(r.Key, r.Value.ToString().Replace("|", "/"));
}
msSubRoutes.Add("MS_SubRoutes", httpRouteData);
var newRoute = new HttpRouteData(routeData.Route, msSubRoutes);
request.SetRouteData(newRoute);
var test = request.GetRouteData();
var resp = await base.SendAsync(request, cancellationToken);
return resp;
}
}
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional, controller = "Vehicles" }
);
config.MessageHandlers.Add(new CustomHander());
}
}
如果我删除下面的代码行,那么它会正常工作,但显然不会更改路由数据。
request.SetRouteData(newRoute);
Controller 上的操作结果示例:
[Route("api/Makes")]
[HttpGet]
public IHttpActionResult Makes()
{
using (var db = new eCatEntities())
{
var makes = db.VEHICLEs.Select(p => new { TEXT = p.VEHI_MAKE }).Distinct().OrderBy(p => p.TEXT);
return Json(makes.ToList());
}
}
[Route("api/Models/{make}")]
[HttpGet]
public IHttpActionResult Models(string make)
{
using (var db = new eCatEntities())
{
var models = db.VEHICLEs.Where(p => p.VEHI_MAKE == make.Replace("|", "/")).Select(p => new { TEXT = p.VEHI_MODEL, p.VEHI_ALPHASORT }).Distinct().OrderBy(p => p.VEHI_ALPHASORT);
return Json(models.ToList());
}
}
一个示例 url 是:
http://domain:port/api/Makes
http://domain:port/api/Models/Jaguar|Daimler
最佳答案
扩展路由的扩展点是IHttpRoute
(或其默认的具体实现HttpRoute
)。处理程序是一个较低级别的对象,它没有生成传出路由的能力(如果您将 /
放在路由值中,您肯定需要解决这个问题)。
public class ReplacePipeHttpRoute : System.Web.Http.Routing.HttpRoute
{
public ReplacePipeHttpRoute(string routeTemplate, object defaults)
: base(routeTemplate, new HttpRouteValueDictionary(defaults))
{ }
// OPTIONAL: Add additional overloads for constraints, dataTokens, and handler
// Converts | to / on incoming route
public override IHttpRouteData GetRouteData(string virtualPathRoot, System.Net.Http.HttpRequestMessage request)
{
var routeData = base.GetRouteData(virtualPathRoot, request);
// RouteData will be null if the URL or constraint didn't match
if (routeData != null)
{
var newValues = new HttpRouteValueDictionary();
foreach (var r in routeData.Values)
{
newValues.Add(r.Key, r.Value.ToString().Replace("|", "/"));
}
routeData = new HttpRouteData(this, newValues);
}
return routeData;
}
// Converts / to | on outgoing route (URLs that are generated from WebApi)
public override IHttpVirtualPathData GetVirtualPath(System.Net.Http.HttpRequestMessage request, IDictionary<string, object> values)
{
var newValues = new Dictionary<string, object>();
if (values != null)
{
foreach (var r in values)
{
// Encode pipe as outlined in: http://www.tutorialspoint.com/html/html_url_encoding.htm
newValues.Add(r.Key, r.Value.ToString().Replace("/", "%7c"));
}
}
return base.GetVirtualPath(request, newValues);
}
}
用法
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.Routes.Add(
name: "DefaultApi",
route: new ReplacePipeHttpRoute(
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional, controller = "Vehicles" })
);
}
}
NOTE: You might want to reconsider using a pipe character in your URLs.
关于c# - Web Api 路由处理程序更改路由数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35460198/