OWIN启动类 [英] OWIN Startup Class

问题描述

有人可以告诉我OWIN启动类的确切角色吗?基本上我在找什么:

Can someone please tell me the exact role of the OWIN startup class. Basically what I am looking for :

• 它的用途是什么
• 何时调用，仅一次或每个请求
• 这是配置依赖注入库的好地方.

推荐答案

Owin被设计为可插入的deisgn.您可以通过配置更改/替换一组服务.例如，在以下配置中，我有

Owin is designed to be pluggable deisgn. there are a set of services which you can change/replace from the configuration. For example in the following configuration, i have

• 启用了webapi
• 已启用信号器
• 为Signalr启用了基于属性的路由
• 配置的默认依赖项解析器
• 使用自定义日志记录器替换日志记录服务

因此，通过这种方式，您可以配置完整的配置. 在启动时将仅被调用一次.您可以在此处设置/使用依赖关系解析器并对其进行配置，但这主要取决于您的总体设计.

So , this way, you can configure the complete configuration. It will be called only once at startup. You can set/use dependency resolver and configure it here, but that depends mainly on your overall design.

public class OwinStartup
{
    //initialize owin startup class and do other stuff
    public void Configuration(IAppBuilder app)
    {
        app.UseWelcomePage("/");
        //var container = new UnityContainer();

        HttpConfiguration httpConfiguration = new HttpConfiguration();
        httpConfiguration.Routes.MapHttpRoute(
            name: "MyDefaultApi",
            routeTemplate: "api/v2/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
            );

        //Maps the attribute based routing
        httpConfiguration.MapHttpAttributeRoutes();

        //Set the unity container as the default dependency resolver
        httpConfiguration.DependencyResolver = new UnityWebApiDependencyResolver(new UnityContainer());

        //replace (or add) the exception logger service to custom Logging service
        httpConfiguration.Services.Replace(typeof(IExceptionLogger), new ExLogger());
        app.UseWebApi(httpConfiguration);

        //Add Signalr Layer
        app.MapSignalR(new HubConfiguration
        {
            EnableJSONP = true,
            EnableDetailedErrors = true
        });
    }

    public class ExLogger : ExceptionLogger
    {
        public override void Log(ExceptionLoggerContext context)
        {
            base.Log(context);
            //do something
        }
    }
}

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