using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace Mtxfw.Utility
{
    /// <summary>
    /// 自定义异常显示 by Telesa 2011.04.06
    /// </summary>
    public class Error
    {
        private string _path = System.Web.HttpContext.Current.Server.MapPath("ErrorTemplate.htm");
        private string isError;
        private Exception _exc;

        public Error(Exception ex)
        {
            //读取Web.Config的设置 true 则开启
            isError = System.Configuration.ConfigurationManager.AppSettings["Error"];
            _exc = ex;
        }

        /// <summary>
        /// 读取自定义异常的页面模板
        /// </summary>
        /// <returns></returns>
        private string Reader()
        {
            string str = string.Empty;
            try
            {
                if (File.Exists(_path))
                {
                    StreamReader sr = new StreamReader(_path, Encoding.GetEncoding("gb2312"));
                    str = sr.ReadToEnd();
                    sr.Close();
                    sr.Dispose();
                }
            }
            catch (Exception ex)
            {
                str = ex.Message;
            }

            return str;
        }

        /// <summary>
        /// 将异常信息写入到自定义页面
        /// </summary>
        public void Write()
        {
            if (isError.ToLower() == "true")
            {
                string str = Reader();
                if (str!=string.Empty)
                {
                    str = str.Replace("$Message$", _exc.Message);
                    System.Web.HttpContext.Current.Response.Write(str);
                    System.Web.HttpContext.Current.Response.End();
                    System.Web.HttpContext.Current.Server.ClearError();
                }
            }
        }
    }
}