在 LINQPad 中使用 WebAPI？

Question

当我尝试在 LINQPad 中使用 Selfhosted WebAPI 时，我一直收到相同的错误，即该类的控制器不存在。

我是否必须为 WebAPI（控制器/类）创建单独的程序集，然后在我的查询中引用它们？

这是我正在使用的代码

#region namespaces
using AttributeRouting;
using AttributeRouting.Web.Http;
using AttributeRouting.Web.Http.SelfHost;
using System.Web.Http.SelfHost;
using System.Web.Http.Routing;
using System.Web.Http;
#endregion

public void Main()
{

    var config = new HttpSelfHostConfiguration("http://192.168.0.196:8181/");
    config.Routes.MapHttpAttributeRoutes(cfg =>
    {
        cfg.AddRoutesFromAssembly(Assembly.GetExecutingAssembly());
    });
    config.Routes.Cast<HttpRoute>().Dump();

    AllObjects.Add(new UserQuery.PlayerObject { Type = 1, BaseAddress = "Hej" });

    config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;
    using(HttpSelfHostServer server = new HttpSelfHostServer(config))
    {
        server.OpenAsync().Wait();
        Console.WriteLine("Server open, press enter to quit");
        Console.ReadLine();
        server.CloseAsync();
    }

}

public static List<PlayerObject> AllObjects = new List<PlayerObject>();

public class PlayerObject
{
    public uint Type { get; set; }
    public string BaseAddress { get; set; }
}

[RoutePrefix("players")]
public class PlayerObjectController : System.Web.Http.ApiController
{
    [GET("allPlayers")]
    public IEnumerable<PlayerObject> GetAllPlayerObjects()
    {
        var players = (from p in AllObjects
                    where p.Type == 1
                    select p);
        return players.ToList();
    }
}

此代码在 VS2012 的单独控制台项目中运行良好。

当我没有让“正常”的 WebAPI 路由工作时，我开始通过 NuGET 使用 AttributeRouting。

我在浏览器中得到的错误是：No HTTP resource was found that matches the request URI 'http://192.168.0.196:8181/players/allPlayers'.

附加错误：No type was found that matches the controller named 'PlayerObject'

Answer 1

Web API 默认会忽略不公开的控制器，而 LinqPad 类是嵌套公开的，我们在 scriptcs 中遇到过类似的问题

您必须添加一个自定义控制器解析器，这将绕过该限制，并允许您手动从正在执行的程序集中发现控制器类型。

这实际上已经修复（现在 Web API 控制器只需要可见不公开），但这发生在 9 月，并且自主机的最新稳定版本是从 8 月开始的。

所以，添加这个：

public class ControllerResolver: DefaultHttpControllerTypeResolver {

    public override ICollection<Type> GetControllerTypes(IAssembliesResolver assembliesResolver) {
        var types = Assembly.GetExecutingAssembly().GetExportedTypes();
        return types.Where(x => typeof(System.Web.Http.Controllers.IHttpController).IsAssignableFrom(x)).ToList();
    }

}

然后根据你的配置注册，你就完成了：

var conf = new HttpSelfHostConfiguration(new Uri(address));
conf.Services.Replace(typeof(IHttpControllerTypeResolver), new ControllerResolver());

这是一个完整的工作示例，我刚刚针对 LinqPad 进行了测试。请注意，您必须以管理员身份运行 LinqPad，否则您将无法监听端口。

public class TestController: System.Web.Http.ApiController {
    public string Get() {
        return "Hello world!";
    }
}

public class ControllerResolver: DefaultHttpControllerTypeResolver {
    public override ICollection<Type> GetControllerTypes(IAssembliesResolver assembliesResolver) {
        var types = Assembly.GetExecutingAssembly().GetExportedTypes();
        return types.Where(x => typeof(System.Web.Http.Controllers.IHttpController).IsAssignableFrom(x)).ToList();
    }
}

async Task Main() {
    var address = "http://localhost:8080";
    var conf = new HttpSelfHostConfiguration(new Uri(address));
    conf.Services.Replace(typeof(IHttpControllerTypeResolver), new ControllerResolver());

    conf.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );

    var server = new HttpSelfHostServer(conf);
    await server.OpenAsync();

    // keep the query in the 'Running' state
    Util.KeepRunning();
    Util.Cleanup += async delegate {
        // shut down the server when the query's execution is canceled
        // (for example, the Cancel button is clicked)
        await server.CloseAsync();
    };
}