使用HttpRequestMessage.Properties进行每个请求的上下文 [英] Carrying per-request context using the HttpRequestMessage.Properties

问题描述

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，一切都在IIS上正常运行。 NET Web API自主（测试版）软件包我需要创建一个自定义生命周期才能对这些每个HTTP请求的服务。

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

解决方案

我建议您使用消息处理程序将一些对象设置为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（此HttpRequestMessage请求，MyContext ctx）
 {
 request.Properties [HttpPropertyKey.MyProperty] = ctx; 
} 
} 
 public class MyMessageHandler：DelegatingHandler 
 {
 protected override Task< HttpResponseMessage> SendAsync（HttpRequestMessage request，CancellationToken cancelToken）
 {
 request.SetContext（new MyContext（）{/ * some your data * /}）; 
 return base.SendAsync（request，cancellationToken）; 
} 
} 
 
 public class MyController：ApiController 
 {
 public object GetData（）
 {
 MyContext ctx = this .Request.GetContext（）; //使用extenstion方法
} 
} 
  

In a Web API application, I use Castle Windsor to supply services configured with PerWebRequest lifetime and everything works fine on IIS.

However, when I use the ASP.NET Web API Self Host (Beta) package I need to create a custom lifetime in order to scope those services per HTTP request.

How can I carry per-request context using the HttpRequestMessage.Properties?

解决方案

I'd suggest you using a message handler to set some your object into 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
    }
}

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