代码修改后的版本，全部提交

Mtxfw.Utility/WXPay.Notify.cs

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+using System;
+using System.Collections.Generic;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+using System.Text;
+
+namespace Mtxfw.Utility
+{
+    /// <summary>
+    /// 回调处理基类
+    /// 主要负责接收微信支付后台发送过来的数据，对数据进行签名验证
+    /// 子类在此类基础上进行派生并重写自己的回调处理过程
+    /// </summary>
+    public class wxNotify
+    {
+        public Page page {get;set;}
+        public wxNotify(Page page)
+        {
+            this.page = page;
+        }
+
+        /// <summary>
+        /// 接收从微信支付后台发送过来的数据并验证签名
+        /// </summary>
+        /// <returns>微信支付后台返回的数据</returns>
+        public WxPayData GetNotifyData(Mtxfw.Utility.Config config)
+        {
+            //接收从微信后台POST过来的数据
+            System.IO.Stream s = page.Request.InputStream;
+            int count = 0;
+            byte[] buffer = new byte[1024];
+            StringBuilder builder = new StringBuilder();
+            while ((count = s.Read(buffer, 0, 1024)) > 0)
+            {
+                builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
+            }
+            s.Flush();
+            s.Close();
+            s.Dispose();
+
+            Log.Info(this.GetType().ToString(), "Receive data from WeChat : " + builder.ToString());
+
+            //转换数据格式并验证签名
+            WxPayData data = new WxPayData();
+            try
+            {
+                data.FromXml(config, builder.ToString());
+            }
+            catch(WxPayException ex)
+            {
+                //若签名错误，则立即返回结果给微信支付后台
+                WxPayData res = new WxPayData();
+                res.SetValue("return_code", "FAIL");
+                res.SetValue("return_msg", ex.Message);
+                Log.Error(this.GetType().ToString(), "Sign check error : " + res.ToXml());
+                page.Response.Write(res.ToXml());
+                page.Response.End();
+            }
+
+            Log.Info(this.GetType().ToString(), "Check sign success");
+            return data;
+        }
+
+        //派生类需要重写这个方法，进行不同的回调处理
+        public virtual void ProcessNotify(Mtxfw.Utility.Config config)
+        {
+
+        }
+    }
+}