asp.net 导出Excel/Word

asp.net中导出有很多方法。其中比较推荐的兼容导出是导出为word/excel兼容的mhtml格式并设置流格式为word或excel。
这中方法的好处是可以建立一个通用的库。本文中提出了一个通用的导出类，实践中使用效果较好。（ps，html解析类写的比较仓促，各位如有兴趣可重写一下~）
///
///@Author Simsure
///@Version 1.0
///
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Net;
using System.IO;
/// <summary>
///MHtmlDocument 的摘要说明
/// </summary>
public class MHtmlDocument
{
    protected const string _NEXT_PART = "------=_NextPart_WIND";
    protected const string _4NEXT_PART = "----=_NextPart_WIND";
    private const string WIND_SESSION_ID = "wind.sessionid";
    protected string _encoding = "utf-8";
    protected string _pageVirutalPath;
    protected string _rootHttpVirtualPath;
    protected bool _enableBase64 = false;
    protected HtmlDocument _baseDocument;
    protected HttpRequest _request;
    protected HttpResponse _response;
    protected static readonly log4net.ILog _log = log4net.LogManager.GetLogger("MHtmlDocument");
    public string Encoding
    {
        get { return _encoding; }
    }
    public string RootHttpVirtualPath
    {
        get { return _rootHttpVirtualPath; }
    }
    public string PageVirtualPath
    {
        get { return _pageVirutalPath; }
    }
    public bool EnableBase64
    {
        get { return _enableBase64; }
        set { _enableBase6