使用HttpRequestMessage.Properties承载每个请求上下文

Question

在Web API应用程序中,我使用Castle Windsor提供配置了PerWebRequest生命周期的服务,并且一切正常.

但是,当我使用ASP.NET Web API Self Host(Beta)包时,我需要创建一个自定义生命周期,以便根据HTTP请求确定这些服务的范围.

如何使用HttpRequestMessage.Properties携带每个请求上下文？

Answer 1

我建议你使用消息处理程序将你的对象设置为HttpRequestMessage.Property:

public class MyApplication : HttpApplication
{
    protected void Application_Start()
    {
        RegisterHttpMessageHandlers(GlobalConfiguration.Configuration);
    }
    public void RegisterHttpMessageHandlers(HttpConfiguration config)
    {
        config.MessageHandlers.Add(new MyMessageHandler());
    }
}

public static class MyHttpMessageHandlerExtensions
{
    public static class HttpPropertyKey
    {
        public static readonly string MyProperty = "MyCompany_MyProperty";
    }

    public static MyContext GetContext(this HttpRequestMessage request)
    {
        return (MyContext)request.Properties[HttpPropertyKey.MyProperty ];
    }

    public static void SetContext(this HttpRequestMessage request, MyContext ctx)
    {
        request.Properties[HttpPropertyKey.MyProperty] = ctx;
    }
}
public class MyMessageHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        request.SetContext(new MyContext(){/*some your data*/});
        return base.SendAsync(request, cancellationToken);
    }
}

public class MyController: ApiController
{
    public object GetData()
    {
        MyContext ctx = this.Request.GetContext(); // the extenstion method is used
    }
}