Owin/Katana System.EntryPointNotFoundException 装配在别处

Question

不知何故我找不到遇到同样问题的人。

我们有一个基于插件的项目，在主文件夹中我们有 Plugin Starter、Bootstrapper 和一些依赖项。

插件位于 "Plugins" 文件夹中，里面还有一些其他文件夹。

我的Startup.cs文件如下：

public class Startup
{
    public void Configuration(IAppBuilder appBuilder)
    {
        appBuilder.Use(async (env, next) =>
        {
            new object().Info(string.Concat("Http method: ", env.Request.Method, ", path: ", env.Request.Path));
            await next();
            new object().Info(string.Concat("Response code: ", env.Response.StatusCode));
        });

        RunWebApiConfiguration(appBuilder);
    }

    private static void RunWebApiConfiguration(IAppBuilder appBuilder)
    {
        var httpConfiguration = new HttpConfiguration();
        httpConfiguration.Routes.MapHttpRoute(
            name: "WebApi"
            , routeTemplate: "{controller}/{id}"
            , defaults: new { id = RouteParameter.Optional }
            );

        appBuilder.UseWebApi(httpConfiguration);

    }
}

调用如下：

WebApp.Start<Startup>("http://localhost/MyRestApi");

如果我将程序集加载到同一个文件夹，没问题，但如果我将它加载到 "belongs" 的位置，我就无法让 Owin 找到它。

有人曾经运行了解过这个或有任何想法吗？我可能会想到 App.config 中的配置行之类的东西，但我认为这不是解决方案。

更新 1：

当我将 Rest Service 程序集复制到主目录时，系统再次运行，但随后它被加载了两次，这是一个大问题。

当我发送休息请求时，我收到以下消息：

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

Answer 1

好的，在网上转了一圈，找到了解决办法，就是Dependency Injection.

在这个post“How to use DI container when OwinStartup”中你可以找到很多可能性，但我实现并解决了我的问题的是这个博客post：

https://damienbod.wordpress.com/2013/10/01/self-host-webapi-with-owin-and-unity/

我希望这可以帮助其他人。

Owin/Katana System.EntryPointNotFoundException 装配在别处

Owin/Katana System.EntryPointNotFoundException Assembly located elsewhere

c#

rest

plugins

owin

katana