asp.net-mvc - ASP.NET Web API 错误 : No HTTP resource was found that matches the request URI

Question

我正在尝试将 Web API 添加到现有的 ASP.NET MVC 项目中。这最初是一个 ASP.NET MVC 2 网站，后来使用以下过程升级到 MVC 3，然后再次升级到 MVC 4:

Upgrading an ASP.NET MVC 2 Project to ASP.NET MVC 3

Upgrading an ASP.NET MVC 3 Project to ASP.NET MVC 4

我的 Api Controller 非常简单。实际上，它是默认模板:

public class ValuesController : ApiController
{
    // GET api/values
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    // GET api/values/5
    public string Get(int id)
    {
        return "value";
    }
}

我添加了一个类来注册 API 路由。

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

从Application_Start调用

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();

    WebApiConfig.Register(GlobalConfiguration.Configuration);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
}

但是，当我尝试访问“localhost:50315/api/values”时，出现以下错误:

<Error>
<Message>
    No HTTP resource was found that matches the request URI    'http://localhost:50315/api/values'.
</Message>
<MessageDetail>
    No type was found that matches the controller named 'values'.
</MessageDetail>
</Error>

根据路由调试器，路由似乎工作正常，Web api 路由是第一个“匹配当前请求”的条目。

Answer 1

请参阅以下步骤 - 它可能不会给您正确的答案，但会给您调试问题的方向。您可以一项一项地执行这些操作。

1. 确保您已执行以下操作:

   Install-Package Microsoft.AspNet.WebApi
   

这只是为了确保您拥有正确的 DLL。

您可以尝试的另一件事是在 get 顶部添加一条路由。

class ValuesController : ApiController
{ 
    [System.Web.Http.Route("api/values")]
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    public string Get(int id)
    {
        return "value";
    }
}

禁用 MvC 路由进行调试。即

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    GlobalConfiguration.Configure(WebApiConfig.Register);
}

启用 GET 动词。

我在下面给你我的项目作为引用。

 <httpProtocol>
      <customHeaders>

        <add name="Access-Control-Allow-Headers" value="*" />
        <add name="Access-Control-Allow-Methods" value="*" />
      </customHeaders>
    </httpProtocol>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <remove name="WebDAV" />
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>