通过ASP NET Core中的HTTP请求记录IIS自定义字段

Question

我为我的网站启用了带有自定义字段的IIS日志记录。

以前在MVC中，我曾使用HTTPHandlers和Module将上述字段添加到HTTP Request标头中。

web.config：

 <modules runAllManagedModulesForAllRequests="true">
     <!--Handler to process the IIS logs of the site Pagevisit logs-->
    <add name="IISLogger" type="MySite.Website.MvcApplication.Utils.IISLogHandler, MySite.Website.MvcApplication" />
</modules>

IISLogHandler类：

public class IISLogHandler : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        private void context_BeginRequest(object sender, EventArgs e)
        {
              var request = (sender as HttpApplication).Request;
              request.Headers["IIID"] = iiid;
              request.Headers["IID"] = !string.IsNullOrEmpty(customerId) ? 
               customerId : iid;

        }
}

我生成的日志：

如何将其迁移到ASPNET Core 2.2.0？

Answer 1

根据"Migrating the HTTP handlers and modules code to ASP.NET Core middleware" 文档，以下模板可以帮助实施：

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using System.Threading.Tasks;

public class LoggingMiddleware
{
    private readonly RequestDelegate _next;

    public string iid = Guid.NewGuid().ToString();
    public string customerId = string.Empty;

    public LoggingMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context)
    {
        
        // Do something with context near the beginning of request processing.

        context.Request.Headers["IIID"] = Guid.NewGuid().ToString();
        context.Request.Headers["IID"] = !string.IsNullOrEmpty(customerId) ? customerId : iid;

        await _next.Invoke(context);

        // Clean up.
    }
}

public static class LoggingMiddlewareExtensions
{
    public static IApplicationBuilder UseLoggingMiddleware(this IApplicationBuilder builder)
    {

        return builder.UseMiddleware<LoggingMiddleware>();
    }
}

public class Startup
{
    public void Configure(IApplicationBuilder app)
    {
        app.UseLoggingMiddleware();
    }
}

另外，github上也打开了相关问题