c# – 请求/响应记录的响应主体

我正在尝试编写一个Owin midleware组件,它将记录每个传入的请求和对数据库的响应.

这是我设法得到多远.

我一直在阅读回复.说：

Stream does not support reading.

我如何阅读Response.Body？

public class LoggingMiddleware : OwinMiddleware
 {
        private static Logger log = LogManager.GetLogger("WebApi");

        public LoggingMiddleware(OwinMiddleware next,IAppBuilder app)
            : base(next)
        {
        }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

            var sw = new Stopwatch();
            sw.Start();

            var logRequest = new log_Request
            {
                Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,Headers = Json.Encode(context.Request.Headers),IPTo = context.Request.LocalIpAddress,IpFrom = context.Request.RemoteIpAddress,Method = context.Request.Method,Service = "Api",Uri = context.Request.Uri.ToString(),UserName = context.Request.User.Identity.Name

            };
            db.log_Request.Add(logRequest);
            context.Request.Body.Position = 0;

            await Next.Invoke(context);

            var mem2 = new MemoryStream();
            await context.Response.Body.copyToAsync(mem2);

            var logResponse = new log_Response
            {
                Headers = Json.Encode(context.Response.Headers),Body = new StreamReader(mem2).ReadToEndAsync().Result,ProcessingTime = sw.Elapsed,ResultCode = context.Response.StatusCode,log_Request = logRequest
            };

            db.log_Response.Add(logResponse);

            await db.SaveChangesAsync();
        }
    }
}

解决方法

Response Body可以这种方式记录：

public class LoggingMiddleware : OwinMiddleware
{
    private static Logger log = LogManager.GetLogger("WebApi");

    public LoggingMiddleware(OwinMiddleware next,IAppBuilder app)
        : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

           var sw = new Stopwatch();
           sw.Start();

           var logRequest = new log_Request
           {
               Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,UserName = context.Request.User.Identity.Name
           };

           db.log_Request.Add(logRequest);
           context.Request.Body.Position = 0;

           Stream stream = context.Response.Body;
           MemoryStream responseBuffer = new MemoryStream();
           context.Response.Body = responseBuffer;

           await Next.Invoke(context);

           responseBuffer.Seek(0,SeekOrigin.Begin);
           var responseBody = new StreamReader(responseBuffer).ReadToEnd();

           //do logging

           var logResponse = new log_Response
           {
               Headers = Json.Encode(context.Response.Headers),Body = responseBody,log_Request = logRequest
           };

           db.log_Response.Add(logResponse);

           responseBuffer.Seek(0,SeekOrigin.Begin);
           await responseBuffer.copyToAsync(stream);

           await db.SaveChangesAsync();
        }
    }
}