在LINQPad中使用WebAPI？

Question

当我尝试在LINQPad中使用Selfhosted WebAPI时,我只是得到了相同的错误,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();
    }
}

在VS2012中的单独控制台项目中,此代码可以正常工作.

当我没有让"正常"的WebAPI路由工作时,我开始通过NuGET使用AttributeRouting.

我在浏览器中遇到的错误是: 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

默认情况下,Web API将忽略非公共控制器,而LinqPad类是嵌套公共的,我们在脚本中遇到了类似的问题

您必须添加一个自定义控制器解析程序,它将绕过该限制,并允许您手动从执行程序集中发现控制器类型.

这实际上已经修复了(现在Web API控制器只需要是Visible而不是公共的),但是那次发生在9月,最新的稳定版本的自我主机是从8月开始.

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();
    }

}

然后注册您的配置,您就完成了:

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,否则您将无法在端口上侦听.

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();
    };
}