#region 上传Execl文件     protected void Button1_Click(object sender, EventArgs e)     {         if (FileUpload1.HasFile)         {             string NewFileName = string.Empty;             string ErrorMess = UpLoadFile(FileUpload1, ".xls|.xlsx", 1024 * 5, Server.MapPath("/Report/SocialApply/"), 1, out NewFileName);             if (string.IsNullOrEmpty(ErrorMess))             {                 Label1.Text = "√文件上传成功";                 ViewState["UpLoadFile"] = "/Report/SocialApply/" + NewFileName;                 try                 {                     FileStream file = new FileStream                         (Server.MapPath(ViewState["UpLoadFile"] as string),                         FileMode.Open, FileAccess.Read,                         FileShare.ReadWrite);                     DataTable dt1 = FairHR.Util.XmlExcelReport.ReadExcelToDataTable(file, 0, 0);                     ViewState.Add("ViewDT", dt1);                     GridView1.DataSource = ViewState["ViewDT"] as DataTable;                     GridView1.DataBind();                     file.Close();                     //Maticsoft.Common.MessageBox.ResponseScript(Page, "$.messager.alert('系统提示', '操作成功！', 'info');");                 }                 catch                 {                     Maticsoft.Common.MessageBox.ResponseScript(Page, "$.messager.alert('系统提示', '请重新上传Execl文件再操作', 'warning');");                 }             }             else             {                 Label1.Text = "×文件上传失败";             }         }         else         {             Label1.Text = "×请先选择上传文件";         }         ScriptManager.RegisterClientScriptBlock(Page, this.GetType(), "idAlert1", "closeLoad();", true);     }     #endregion     #region 上传文件     /// <summary>     /// 上传文件     /// </summary>     /// <param name="fu">上传文件</param>     /// <param name="type">上传文件类型,例如.jpg|.gif|.bmp</param>     /// <param name="size">限制上传文件大小，单位为k</param>     /// <param name="path">上传路径，需使用server.mappath</param>     /// <param name="nametype">1为自动命名,0用原名</param>     /// <returns></returns>     public static string UpLoadFile(FileUpload fu, string type, int size, string path, int nametype, out string newFileName)     {         newFileName = null;         string erorr = null;         int Size = fu.PostedFile.ContentLength / 1024;         if (Size > size)         {             erorr = "上传文件太大！";             return erorr;         }         string Type = fu.FileName;         if (Type.IndexOf(".") == -1) { erorr = "上传文件类型有误！"; return erorr; }         Type = Type.Substring(Type.LastIndexOf(".")).ToUpper();         type = type.ToUpper();         if (type.IndexOf(Type) == -1) { erorr = "上传文件类型有误！"; return erorr; }         string filename = "";         if (nametype == 1)         {             string nowdate = DateTime.Now.ToString();             nowdate = nowdate.Replace(":", "").Replace(" ", "").Replace("-", "").Trim();             Random r = new Random();             int a = r.Next(1000);             filename = nowdate + a.ToString() + Type;             newFileName = filename;         }         else         {             filename = fu.FileName;             if (System.IO.File.Exists(path + filename)) { erorr = "此文件名已经存在！"; return erorr; }         }         fu.SaveAs(path + filename);         return erorr;//返回有错的错误信息，没有错误返回null     }     #endregion