C# 有没有办法用WebAPI生成URL？

在下面进行后期编辑

我们无法理解为什么从WebApi控制器的上下文使用时，

UrlHelper

返回空字符串

我们已经做了必要的调试，但我们无法找出为什么会发生这种情况，RouteData中有路由，但它似乎不起作用

在大多数情况下，我们使用RenderViewToString函数，该函数加载由调用

Url.RouteUrl（routeName）

组成的视图

已经尝试过的方法是创建一个自定义的UrlHelper（但没有效果）并使用UrlHelper（MVC/HTTP）进行调试

属性路由与路由名称一起使用

使用代码示例：

    public class WebApiController : BaseApiController
    {
        [HttpPost]
        [ResponseType(typeof(string))]
        [Route("cart/get/checkout", Name = "api.cart.get.checkout")]
        public IHttpActionResult GetCheckOutShoppingCart([FromBody] string data)
        {
               return Ok(RenderViewToString("CartController", "_CheckOutCartPartial", new ShoppingCartModel(Auth.IsAuthenticated ? Auth.GetCustomer().DefaultShippingInfo.CountryId : 148)
               {
                   AddInsurance = false,
                   InsuredShipping = insuredShipping,
                   CurrentDeliveryMethodId = deliveryMethodId,
                   CurrentPaymentMethodId = paymentMethodId
               }));
        }
   }

BaseApiController类：

 public class BaseApiController : ApiController
    {
        public static string RenderViewToString(string controllerName, string viewName)
        {
            return RenderViewToString(controllerName, viewName, new Dictionary<string, object>());
        }

        public static string RenderViewToString(string controllerName, string viewName, object model)
        {
            using (var writer = new StringWriter())
            {
                var routeData = new RouteData();
                routeData.Values.Add("controller", controllerName);
                var fakeControllerContext =
                    new ControllerContext(
                        new HttpContextWrapper(new HttpContext(new HttpRequest(null, "http://google.com", null),
                            new HttpResponse(null))), routeData, new FakeController());
                var razorViewEngine = new RazorViewEngine();
                var razorViewResult = razorViewEngine.FindView(fakeControllerContext, viewName, "", false);
                var viewContext = new ViewContext(fakeControllerContext, razorViewResult.View,
                    new ViewDataDictionary(model), new TempDataDictionary(), writer);
                razorViewResult.View.Render(viewContext, writer);
                return writer.ToString();
            }
        }

        public static string RenderViewToString(string controllerName, string viewName, Dictionary<string, Object> data)
        {
            using (var writer = new StringWriter())
            {
                var viewData = new ViewDataDictionary();
                foreach (var kv in data)
                {
                    viewData[kv.Key] = kv.Value;
                }

                var routeData = new RouteData();
                routeData.Values.Add("controller", controllerName);
                var fakeControllerContext =
                    new ControllerContext(
                        new HttpContextWrapper(new HttpContext(new HttpRequest(null, "http://google.com", null),
                            new HttpResponse(null))), routeData, new FakeController());
                var razorViewEngine = new RazorViewEngine();
                var razorViewResult = razorViewEngine.FindView(fakeControllerContext, viewName, "", false);
                var viewContext = new ViewContext(fakeControllerContext, razorViewResult.View, viewData,
                    new TempDataDictionary(), writer);
                razorViewResult.View.Render(viewContext, writer);
                return writer.ToString();
            }
        }

        private class FakeController : ControllerBase
        {
            protected override void ExecuteCore()
            {
            }
        }
    }

试试Uri.Link（routeName，object）

---

如果属性名称与路由参数匹配，这将把给定对象的属性注入路由。

WebApi不是MVC。尽管看起来很相似，但这是一个完全不同的系统

UrlHelper（即MVC）将查看MVC路由表，并忽略任何WebApi路由

---

尝试用硬方法创建路由，本质上是将控制器和操作名称硬编码到视图中：-（

好的，根据您的评论，您似乎试图从MVC layout.cshtml文件中调用

Url.RouteUrl（string routeName，object routeValues=null）

或

Url.HttpRouteUrl（string routeName，object routeValues=null）

如果是这种情况，则

Url.IsWebApiRequest（）

将返回

false

，因为layout.cshtml文件仅作为处理MVC请求的一部分进行处理，而不是WebAPI。这将导致Url生成方法使用MVC路由集合而不是WebAPI集合

 public static class Url
    {
        public static bool IsWebApiRequest()
        {
            return
                HttpContext.Current.Request.RequestContext.HttpContext.CurrentHandler is
                    System.Web.Http.WebHost.HttpControllerHandler;
        }

        public static string RouteUrl(string routeName, object routeValues = null)
        {
            var url = String.Empty;
            try
            {
                if (IsWebApiRequest())
                {
                    var helper = new System.Web.Http.Routing.UrlHelper();
                    url = helper.Link(routeName, routeValues);             
                }
                else
                {
                    var helper = new System.Web.Mvc.UrlHelper();
                    url = helper.RouteUrl(routeName, routeValues);              
                }

                return url;
            }
            catch
            {
                return url;
            }
        }

        public static string HttpRouteUrl(string routeName, object routeValues = null)
        {
            var url = String.Empty;
            try
            {
                if (IsWebApiRequest())
                {
                    var helper = new System.Web.Http.Routing.UrlHelper();
                    url = helper.Link(routeName, routeValues);
                }
                else
                {
                    var helper = new System.Web.Mvc.UrlHelper();
                    url = helper.HttpRouteUrl(routeName, routeValues);
                }

                return url;
            }
            catch
            {
                return url;
            }
        }
    }

更改

Url

类，使

RouteUrl

始终构建WebAPI Url，而

HttpRouteUrl

仅构建MVC Url，然后在布局文件中根据特定上下文中需要的Url类型使用适当的方法

public static class Url
{
    public static bool IsWebApiRequest()
    {
        return
            HttpContext.Current.Request.RequestContext.HttpContext.CurrentHandler is
                System.Web.Http.WebHost.HttpControllerHandler;
    }

    public static string RouteUrl(string routeName, object routeValues = null)
    {
        var url = String.Empty;
        try
        {
            var helper = new System.Web.Http.Routing.UrlHelper();
            return helper.Link(routeName, routeValues);             
        }
        catch
        {
            return url;
        }
    }

    public static string HttpRouteUrl(string routeName, object routeValues = null)
    {
        var url = String.Empty;
        try
        {
            var helper = new System.Web.Mvc.UrlHelper();
            return helper.HttpRouteUrl(routeName, routeValues);
        }
        catch
        {
            return url;
        }
    }
}

---

这个问题已经通过构建一个定制的UrlHelper类来解决，该类查看RouteTable，然后返回替换了模式的url

public static class Link
{
    public static string RouteUrl(string routeName, object routeValues = null)
    {
        var url = String.Empty;
        try
        {
            var route = (Route)RouteTable.Routes[routeName];
            if (route == null)
                return url;

            url = "~/".AbsoluteUrl() + route.Url;
            url = url.Replace("{culture}", System.Threading.Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.ToLower());

            if (routeValues == null) 
                return url;

            var values =  routeValues.GetType().GetProperties();
            Array.ForEach(values, pi => url = Regex.Replace(url, "{" + pi.Name + "}", pi.GetValue(routeValues, null).ToString()));

            return url;
        }
        catch
        {
            var newUrl = RouteUrl("403");
            if(newUrl == String.Empty)
                throw;

            return newUrl;
        }
    }

    public static string HttpRouteUrl(string routeName, object routeValues = null)
    {
       return RouteUrl(routeName, routeValues);
    }
}

---

恐怕我们也试过了，但没有效果，大多数Url都是在布局文件中动态生成的。Url.Link只能在WebApicController的上下文中使用。我们已经检查了RouteData集合，它包含MVC和API路由。很好的实现对我帮助很大。

public static class Link
{
    public static string RouteUrl(string routeName, object routeValues = null)
    {
        var url = String.Empty;
        try
        {
            var route = (Route)RouteTable.Routes[routeName];
            if (route == null)
                return url;

            url = "~/".AbsoluteUrl() + route.Url;
            url = url.Replace("{culture}", System.Threading.Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.ToLower());

            if (routeValues == null) 
                return url;

            var values =  routeValues.GetType().GetProperties();
            Array.ForEach(values, pi => url = Regex.Replace(url, "{" + pi.Name + "}", pi.GetValue(routeValues, null).ToString()));

            return url;
        }
        catch
        {
            var newUrl = RouteUrl("403");
            if(newUrl == String.Empty)
                throw;

            return newUrl;
        }
    }

    public static string HttpRouteUrl(string routeName, object routeValues = null)
    {
       return RouteUrl(routeName, routeValues);
    }
}