该约束输入“列举HTTPMethod'的路由必须有一个字符串值 [英] The Constraint Entry 'httpMethod' on the Route Must Have a String Value

问题描述

我有一个asp.net的Web API项目，并在我的 WebApiConfig 文件，我已经定义了以下路线：

  config.Routes.MapHttpRoute（
    名称：网络API获取
    routeTemplate：API / {}控制器，
    默认：新{行动=GET}，
    限制：新{列举HTTPMethod =新HttpMethodConstraint（GET）}
    ）;
 

有关集成测试的目的，我想打一个请求 HttpSelfHostServer 来验证我们接收到正确的数据API调用回来。我使的Htt prequestMessage 如下：

  VAR列举HTTPMethod =新列举HTTPMethod（GET）;
VAR要求=新的Htt prequestMessage（列举HTTPMethod，HTTP：//本地主机：XXXX / API /用户/）;
VAR的结果= _client.SendAsync（要求）。结果;
 

我希望这会呼吁UserController中Get方法，然后返回结果在该方法中定义。但是，我反而得到以下异常：

System.InvalidOperationException：与路径模板API / {}控制器的路线上的约束输入列举HTTPMethod'必须有一个字符串值，或者是它实现IHttpRouteConstraint

这同一个URL（的http：//本地主机：XXXX / API /用户/ ）的作品没有错误，当我在浏览器中使用它，所以我pretty确保该问题已成为我送过的HttpClient 请求到 HttpSelfHostServer 的方式。我已经使用 HttpMethod.Get 不变，而不是尝试过，但也抛出了同样的错误。

没有人有任何想法我怎么能解决这个问题？

解决方案

请确保您使用<$c$c>proper键入 您的约束：

 的约束：新{列举HTTPMethod =新System.Web.Http.Routing.HttpMethodConstraint（HttpMethod.Get）}
 

我猜你是使用<一个href=\"http://msdn.microsoft.com/en-us/library/system.web.routing.httpmethodconstraint.aspx\"><$c$c>System.Web.Routing.HttpMethodConstraint这是用于ASP.NET MVC路由一个完全不同的类，并且具有无关的ASP.NET Web API的路由。

I have an asp.net Web API project, and in my WebApiConfig file, I have the following route defined:

config.Routes.MapHttpRoute(
    name: "Web API Get",
    routeTemplate: "api/{controller}",
    defaults: new { action = "Get" },
    constraints: new { httpMethod = new HttpMethodConstraint("GET") }
    );

For integration testing purposes, I want to make a request to an HttpSelfHostServer to verify that we are receiving the proper data back from the api call. I am making the HttpRequestMessage as follows:

var httpMethod = new HttpMethod("GET");
var request = new HttpRequestMessage(httpMethod, "http://localhost:XXXX/api/User/");
var results = _client.SendAsync(request).Result;

I would expect that this would call the Get method on the UserController and then return the results as defined in that method. However, I instead get the following exception:

System.InvalidOperationException: The constraint entry 'httpMethod' on the route with route template 'api/{controller}' must have a string value or be of a type which implements 'IHttpRouteConstraint'

This same url (http://localhost:XXXX/api/User/) works without error when I use it in the browser, so I am pretty sure the issue has to be in the way I am sending the request to the HttpSelfHostServer through the HttpClient. I have tried using the HttpMethod.Get constant instead, but that also threw the same error.

Does anyone have any idea how I could resolve this issue?

解决方案

Make sure that you are using the proper type for your constraint:

constraints: new { httpMethod = new System.Web.Http.Routing.HttpMethodConstraint(HttpMethod.Get) }

I guess you were using System.Web.Routing.HttpMethodConstraint which is an entirely different class used for ASP.NET MVC routing and which has nothing to do with ASP.NET Web API routing.

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