c# .net mvc webapi Filters 筛选器中获取 请求参数和响应内容

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Grass.Extend;

namespace Grass.Mvc.Infrastructure.Filter
{
    public class WebApiActionDebugFilter : System.Web.Http.Filters.ActionFilterAttribute
    {
        /// <summary>
        /// 是否开启调试
        /// </summary>
        private bool _isDebugLog = true;

        public string DebugId
        {
            set
            {
                var session = System.Web.HttpContext.Current.Session;
                if (session != null)
                {
                    session["RequestDebugId"] = value;
                }
            }
            get
            {
                var session = System.Web.HttpContext.Current.Session;
                if (session != null && session["RequestDebugId"]!=null)
                {
                    return session["RequestDebugId"].ToString();
                }
                return string.Empty;
            }
        }

        public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext context)
        {
            base.OnActionExecuting(context);
            //记录请求内容
            if (_isDebugLog)
            {
                try
                {
                    var guid = System.Guid.NewGuid().ToString();
                    DebugId = guid;
                    var session = System.Web.HttpContext.Current.Session;
                    var request = System.Web.HttpContext.Current.Request;
                    var keys = request.Form.AllKeys;
                    
                    var task = context.Request.Content.ReadAsStreamAsync();
                    var content = string.Empty;
                    using (System.IO.Stream sm = task.Result)
                    {
                        if (sm != null)
                        {
                            sm.Seek(0, SeekOrigin.Begin);
                            int len = (int) sm.Length;
                            byte[] inputByts = new byte[len];
                            sm.Read(inputByts, 0, len);
                            sm.Close();
                            content = Encoding.UTF8.GetString(inputByts);
                        }
                    }
                    string pars = string.Format("请求：\r\n id = {3};\r\n sessionId = {0};\r\n url = {1};\r\n contentType = {4};\r\n content = {2};"
                        ,""// (session==null)?"...":session.SessionID
                        , request.RawUrl
                        , content
                        , guid
                        , request.ContentType);

                }
                catch (Exception ex)
                {
                }
            }
        }
        public override void OnActionExecuted(System.Web.Http.Filters.HttpActionExecutedContext context)
        {
            base.OnActionExecuted(context);
            //记录请求内容
            if (_isDebugLog)
            {
                try
                {
                    var session = System.Web.HttpContext.Current.Session;
                    var task = context.Response.Content.ReadAsStringAsync();
                    var txt = task.Result;
                    string pars = string.Format("响应：\r\n id = {2};\r\n sessionId = {0};\r\n response = {1}"
                        , ""//(session == null) ? "..." : session.SessionID
                        , txt
                        , DebugId);
                }
                catch (Exception ex)
                {
                }
            }
        }
        
    }
}