携带使用HttpRequestMessage.Properties每个请求上下文(Carrying

在Web API应用程序，我使用温莎城堡提供与PerWebRequest终身配置的服务，一切工作正常的IIS。

然而，当我使用的ASP.NET Web API自主机（测试版） 包 ，我需要以创建一个自定义一辈子范围每个HTTP请求的服务。

我怎么可以携带使用HttpRequestMessage.Properties每个请求的情况下？

Answer 1:

我建议你使用一个消息处理你的一些对象设置为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
    }
}

文章来源: Carrying per-request context using the HttpRequestMessage.Properties