找到多个与控制器匹配的类型

Question

我正在尝试 api versioning 使用 header 但在 different folder structure 中，如下所示。

在 Controller folder 中 CustomerController.cs 中有 V1 子文件夹 和

在 Controller folder 中有 V2 子文件夹 CustomerController.cs

当我使用 api 版本使用上面的 URL 时工作正常。

我的问题是当我用 header 尝试这种方法时，出现以下错误：

{ "Message": "An error has occurred.", "ExceptionMessage": "Multiple types were found that match the controller named 'customer'. This can happen if the route that services this request ('api/{controller}/{id}') found multiple controllers defined with the same name but differing namespaces, which is not supported.\r\n\r\nThe request for 'customer' has found the following matching controllers:\r\nApiVersion.Controllers.V1.CustomerController\r\nApiVersion.Controllers.V2.CustomerController", "ExceptionType": "System.InvalidOperationException", "StackTrace": " at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.SelectController(HttpRequestMessage request)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()" }

WebApiConfig.cs

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

CustomeControllerSelector.cs

        public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
        {
            var controllers = GetControllerMapping();
            var routeData = request.GetRouteData();
            var controllerName = routeData.Values["controller"].ToString();
            //HttpControllerDescriptor controllerDescriptor;

            var version = GetVersionFromAcceptHeaderVersion(request);
            var controllerKey = String.Format(CultureInfo.InvariantCulture, "{0}.{1}",
                        version, controllerName);


            //if (controllers.TryGetValue(controllerName, out controllerDescriptor))
            // {

            if (!string.IsNullOrEmpty(version))
            {
                HttpControllerDescriptor versionedControllerDescriptor;
                if (controllers.TryGetValue(controllerKey, out versionedControllerDescriptor))
                {
                    return versionedControllerDescriptor;
                }
            }
            return null;
        }

          private string GetVersionFromAcceptHeaderVersion(HttpRequestMessage request)
        {
            var acceptHeader = request.Headers.Accept;
            foreach (var mime in acceptHeader)
            {
                if (mime.MediaType == "application/json" || mime.MediaType == "text/html")
                {
                    var version = mime.Parameters
                                    .Where(v => v.Name.Equals("version", StringComparison.OrdinalIgnoreCase))
                                    .FirstOrDefault();
                    if (version != null)
                    {
                        return version.Value;
                    }
                    return string.Empty;
                }
            }
            return string.Empty;
        }

Answer 1

我试过跟随。目前有效 -

public class CustomControllerSelector : DefaultHttpControllerSelector
{
    //const string partName = "Webapi.Controllers";
    private readonly HttpConfiguration _config;

    public CustomControllerSelector(HttpConfiguration config)
        : base(config)
    {
        _config = config;
    }

    public override System.Web.Http.Controllers.HttpControllerDescriptor SelectController(HttpRequestMessage request)
    {
        var _route = request.GetRouteData();

        var controllerName = base.GetControllerName(request);

        var type = _config.Services.GetAssembliesResolver();
        var controlles = _config.Services.GetHttpControllerTypeResolver().GetControllerTypes(type);

        object name;
        _route.Values.TryGetValue("route", out name);

        //No more hard coding
        var partName = controllers.FirstOrDefault().Namespace;
        var st = name as string;
        if (st != null)
        {
            var conType = controlles.FirstOrDefault(a => a.Namespace == string.Format("{0}.{1}", partName, st));
                        if (conType != null)
                            return new System.Web.Http.Controllers.HttpControllerDescriptor(_config, controllerName, conType);
        }

        return base.SelectController(request);
    }
}

在WebApiConfig.cs-

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

测试路线 -

http://localhost:60957/api/Another/Route/a
http://localhost:60957/api/Another/Route2/aaaaa