压缩文件上传，然后再解压。这是一段有bug的代码，供自己以后需求参考

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Model;
using BLL;
using Utility;
using System.IO;
using System.Data.OleDb;
using System.Data;
using System.Diagnostics;
using ICSharpCode.SharpZipLib.Zip;

namespace WebUI.SystemPage.Question
{
    public partial class InsertQuestions : System.Web.UI.Page
    {
        protected AdminQuestionManager manager = AdminQuestionManager.GetInstrance();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                try
                {
                    //绑定科目
                    this.ddlSubject.DataSource = manager.GetSubjectAll();
                    this.ddlSubject.DataTextField = "SName";
                    this.ddlSubject.DataValueField = "SID";
                    this.ddlSubject.DataBind();

                    //绑定章节
                    BindChapter();

                    this.lblTitle.Text = "批量添加题目";


                    Model.Questions question = manager.GetQuestionByID(Convert.ToInt32(Request.QueryString["qid"]));
                    for (int i = 0; i < this.ddlSubject.Items.Count; i++)
                    {
                        if (this.ddlSubject.Items[i].Value == question.QSID.ToString())
                        {
                            ddlSubject.ClearSelection();
                            this.ddlSubject.Items[i].Selected = true;
                            break;
                        }
                    }
                    for (int i = 0; i < this.ddlChapter.Items.Count; i++)
                    {
                        if (this.ddlChapter.Items[i].Value == question.QCID.ToString())
                        {
                            ddlSubject.ClearSelection();
                            this.ddlChapter.Items[i].Selected = true;
                            break;
                        }
                    }

                }
                catch (Exception ex)
                {
                    Utility.LogMsg.WriteLogToApplicationFolderByMonth("ChapterEdite.aspx添加或编辑初始化异常：" + ex.ToString());
                }
            }
        }

        /// <summary>
        /// 绑定章节
        /// </summary>
        private void BindChapter()
        {
            this.ddlChapter.DataSource = manager.GetChapterList(1000, 1, " and CSID=" + this.ddlSubject.SelectedItem.Value);
            this.ddlChapter.DataTextField = "CName";
            this.ddlChapter.DataValueField = "CID";
            this.ddlChapter.DataBind();
        }



        /// <summary>
        /// 科目改变事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void ddlSubject_SelectedIndexChanged(object sender, EventArgs e)
        {
            BindChapter();
        }

        /// <summary>
        /// 提交
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void BtnExcel_Click(object sender, EventArgs e)
        {
            string ExceptionStr = "";

            ClientScriptManager cs = Page.ClientScript;
            if (myfile.PostedFile.ContentLength<=0)
            {
                cs.RegisterStartupScript(this.GetType(), "", "ZENG.msgbox.show('请上传压缩文件', 1, 4000);", true);
                return;
            }

            string yasuoFile = myfile.PostedFile.FileName;
            string fileExt = Path.GetExtension(yasuoFile); //获取文件扩展名
            if (fileExt != ".zip")
            {
                cs.RegisterStartupScript(this.GetType(), "", "alert('请选择压缩文件类型zip！')", true);
                return;
            }

            try
            {
                DataTable dt = new DataTable("Questions");
                dt.Columns.Add("QID", typeof(int));
                dt.Columns.Add("QSID",typeof(int));
                dt.Columns.Add("QCID",typeof(int));
                dt.Columns.Add("QDescription",typeof(string));
                dt.Columns.Add("QFileName", typeof(string));
                dt.Columns.Add("QImageName", typeof(string));


                DataTable dt1 = new DataTable();
                string _conn = "Provider=Microsoft.Jet.OleDb.4.0;" + "data source=" + this.txtExcelURL.Text + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
                OleDbConnection MyConnection = new OleDbConnection(_conn);
                MyConnection.Open();
                OleDbDataAdapter da = new OleDbDataAdapter("select [题目内容],[题目内容图片],[flash文件] from [题库导入$]", MyConnection);

                da.Fill(dt1);
                MyConnection.Close();

                string newPath = "";//解压后的新路径

                #region 上传压缩文件
                string file = "";
                file = myfile.PostedFile.FileName;
                newPath = "/SystemPage/UpFile/" + file.Substring(0, file.Length - 4);
                string fileName = file;
                string savePath = "/SystemPage/UpFile/" + file;
                file = Server.MapPath(savePath);
                string filePath = Path.GetDirectoryName(file);

                if (!System.IO.Directory.Exists(filePath))
                {
                    System.IO.Directory.CreateDirectory(filePath);
                }

                myfile.PostedFile.SaveAs(file);
                Decompress(file, Server.MapPath("/SystemPage/UpFile/"));
                File.Delete(file);

                #endregion

                for (int i = 0; i < dt1.Rows.Count; i++)
                {
                    if (!string.IsNullOrEmpty(dt1.Rows[i][2].ToString().Trim()))
                    {
                        DataRow dr = dt.NewRow();
                        dr["QID"] = i + 1;
                        dr["QSID"] = Convert.ToInt32(this.ddlSubject.SelectedValue);
                        dr["QCID"] = Convert.ToInt32(this.ddlChapter.SelectedValue);
                        dr["QFileName"] = newPath + "/" + dt1.Rows[i][2].ToString().Trim();

                        if (!string.IsNullOrEmpty(dt1.Rows[i][1].ToString()))
                        {
                            dr["QImageName"] = newPath + "/" + dt1.Rows[i][1].ToString().Trim();
                        }
                        else
                        {
                            dr["QImageName"] = "";
                        }

                        dr["QDescription"] = dt1.Rows[i][0].ToString();
                        dt.Rows.Add(dr); 
                    }
                }

                string strSMG = "<span style='color:red;font-size:15px'>以下是Excel文件中的数据，实际上没有上传的</span><br>";//记录少那个文件
                int Errot = 0;
                //在文件夹中过滤Excel中不存在的文件
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    string folder = Server.MapPath(newPath);

                    DirectoryInfo fileList = new DirectoryInfo(folder);
                    bool isHave = false;
                    foreach (FileInfo item in fileList.GetFiles())
                    {
                        if (!string.IsNullOrEmpty(dt.Rows[i]["QImageName"].ToString().Trim()))
                        {
                            if (dt.Rows[i]["QImageName"].ToString().IndexOf(item.Name) < 0)
                            {
                                strSMG += dt.Rows[i]["QImageName"].ToString() + "<br>";
                            }
                        }

                        if (dt.Rows[i]["QFileName"].ToString().IndexOf(item.Name) >= 0)
                        {
                            isHave = true;
                            break;
                        }
                    }
                    if (isHave == false)
                    {
                        strSMG += dt.Rows[i]["QFileName"].ToString() + "<br>";
                        Errot++;
                    }
                    
                }

                if (Errot == 0)
                {
                    DivMsg.InnerHtml = "";
                    //如果数据完整则插入数据库manager.InsertQuestionData(dt)
                    if (false)
                    {
                        cs.RegisterStartupScript(this.GetType(), "", "ZENG.msgbox.show('批量添加成功', 4, 3000);", true);
                    }
                    else
                    {
                        #region 删除之前同文件夹名称文件数据
                        string path = Server.MapPath(newPath);
                        
                        if (Directory.GetFileSystemEntries(path).Length > 0)
                        {
                            //遍历文件夹中所有文件
                            foreach (string file1 in Directory.GetFiles(path))
                            {
                                //文件己存在
                                if (File.Exists(file1))
                                {
                                    FileInfo fi = new FileInfo(file);
                                    //判断当前文件属性是否是只读
                                    if (fi.Attributes.ToString().IndexOf("ReadyOnly") >= 0)
                                    {
                                        fi.Attributes = FileAttributes.Normal;


                                    }
                                    //删除文件
                                    File.Delete(file1);

                                }
                            }
                            //删除文件夹
                            Directory.Delete(Server.MapPath(newPath));

                        }
                        #endregion

                        cs.RegisterStartupScript(this.GetType(), "", "ZENG.msgbox.show('数据插入失败', 1, 3000);", true);
                    }
                }
                else
                {
                    cs.RegisterStartupScript(this.GetType(), "", "ZENG.msgbox.show('Excel和上传文件的数据不对应，添加失败', 1, 3000);", true);
                    DivMsg.InnerHtml = strSMG;
                }
            }
            catch (Exception ex)
            {
                
            }
            finally 
            {
                cs.RegisterStartupScript(this.GetType(), "", "ZENG.msgbox.show('批量添加异常，请检查是否Excel正在打开', 1, 3000);", true);
            }
        }

        /// <summary>   
        /// 解压缩文件   
        /// </summary>   
        /// <param name="GzipFile">压缩包文件名</param>   
        /// <param name="targetPath">解压缩目标路径</param>          
        public static void Decompress(string GzipFile, string targetPath)
        {
            //string directoryName = Path.GetDirectoryName(targetPath + "\\") + "\\";   
            string directoryName = targetPath;
            if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录   
            string CurrentDirectory = directoryName;
            byte[] data = new byte[2048];
            int size = 2048;
            ZipEntry theEntry = null;
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
            {
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.IsDirectory)
                    {// 该结点是目录   
                        if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
                    }
                    else
                    {
                        if (theEntry.Name != String.Empty)
                        {
                            //解压文件到指定的目录   
                            using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))
                            {
                                while (true)
                                {
                                    size = s.Read(data, 0, data.Length);
                                    if (size <= 0) break;

                                    streamWriter.Write(data, 0, size);
                                }
                                streamWriter.Close();
                            }
                        }
                    }
                }
                s.Close();
            }
        }

    }
}