导出Excel公共方法

 public static class OutputExcel
    {
        private static string outPath = System.Web.HttpContext.Current.Server.MapPath("~");
        private static string outPathHadTrim = System.Web.HttpContext.Current.Server.MapPath("~").TrimEnd(new char[] { ‘/‘, ‘\\‘ });

        /// <summary>
        /// 导出Table中的数据到Excel文件(扩展名为xlsx)
        /// </summary>
        /// <param name="Response"></param>
        /// <param name="writeTable">包含导出数据的Table</param>
        /// <param name="colHeads">列表中各列的标题</param>
        /// <param name="colNames">writeTable中要导出列的列名</param>
        /// <param name="title">页面名称</param>
        /// <param name="filename"></param>
        /// <returns>导出Excel是否成功</returns>
        public static bool exportExcelStream(System.Web.HttpResponse Response, System.Data.DataTable writeTable, string[] colHeads, string[] colNames, string title, string strfilename, out string outputAllpathfile)
        {
            //return export_ToExcel(writeTable, colHeads, colNames, title, strfilename, false, null, out  outputAllpathfile);
            return Output_oledbExcel.Export_Excel(writeTable, colHeads, colNames, strfilename, null, out  outputAllpathfile);
        }
        public static bool exportExcelStream(System.Web.HttpResponse Response, System.Data.DataTable writeTable, string[] colHeads, string[] colNames, string title, string strfilename, bool hasFirstNoCol, string[] dateFormatCols, out string outputAllpathfile)
        {
            return Output_oledbExcel.Export_Excel(writeTable, colHeads, colNames, strfilename, dateFormatCols, out  outputAllpathfile);
        }
}

  public static class Output_oledbExcel
    {
        private static string outPath = System.Web.HttpContext.Current.Server.MapPath("~");
        public static bool Export_Excel(System.Data.DataTable writeTable, string[] colHeads, string[] colNames, string strfilename, string[] dateFormatCols, out string outputAllpathfile)
        {
            string t_exportpath = DateTime.Now.ToString("yyyyMMdd");
            long tickets = System.DateTime.Now.Ticks;
            tickets = tickets % 1000000;
            string filename = strfilename + tickets;
            outputAllpathfile = @"/Log/" + t_exportpath + @"/" + filename + ".xlsx";
            if (writeTable == null)
            {
                return false;
            }
            if (string.IsNullOrEmpty(outPath))
            {
                return false;
            }
            string outputPath = outPath;
            if (outputPath != null && outputPath.Length > 0)
            {
                outputPath = outputPath + @"Log\" + t_exportpath + @"\";
            }
            else
            {
                //"OutputPath could not be copyed."
                return false;
            }
            if (!System.IO.Directory.Exists(outputPath))
            {
                System.IO.Directory.CreateDirectory(outputPath);
            }
            string outFileName = filename + ".xlsx";

            string outPathFileName = outputPath + outFileName;

            List<string> colsnameList = new List<string>();
            List<string> colHeadsList = new List<string>();
            List<int> dateFormatColsList = new List<int>();
            bool date_Format = false;
            if (dateFormatCols != null && dateFormatCols.Length > 0)
            {
                date_Format = true;
            }
            int intColindex = 0; StringBuilder strfield = new StringBuilder();
            for (int intcol = 0; intcol < colNames.Length; intcol++)
            {
                if (writeTable.Columns.Contains(colNames[intcol]) && intcol < colHeads.Length)
                {
                    colHeadsList.Add(colHeads[intcol]);
                    colsnameList.Add(colNames[intcol]);
                    if (date_Format && dateFormatCols.Contains(colNames[intcol]))
                    {
                        dateFormatColsList.Add(intColindex);
                    } strfield.Append("[" + colHeads[intcol] + "]");
                    strfield.Append(",");
                    intColindex++;
                }
            }

            if (strfield.Length > 1)
            {
                strfield.Remove(strfield.Length - 1, 1);
            }

            //////excel 2003格式
            ////string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + outPathFileName + ";Extended Properties=Excel 8.0;";
            ////Excel 2007格式
            string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + outPathFileName + ";Extended Properties=Excel 12.0 Xml;";

            try
            {
                using (OleDbConnection con = new OleDbConnection(connString))
                {
                    con.Open();
                    StringBuilder strSQL = new StringBuilder();
                    strSQL.Append("CREATE TABLE ").Append("[Sheet1]");
                    strSQL.Append("(");

                    for (int coli = 0; coli < colHeadsList.Count; coli++)
                    {
                        strSQL.Append("[" + colHeadsList[coli] + "] text,");
                    }
                    strSQL = strSQL.Remove(strSQL.Length - 1, 1);
                    strSQL.Append(")");

                    OleDbCommand cmd = new OleDbCommand(strSQL.ToString(), con);
                    cmd.ExecuteNonQuery();

                    //for (int KKK = 0; KKK < 30; KKK++)
                    for (int i = 0; i < writeTable.Rows.Count; i++)
                    {
                        strSQL.Clear();

                        StringBuilder strvalue = new StringBuilder();
                        for (int j = 0; j < colHeadsList.Count; j++)
                        {

                            if (date_Format && dateFormatColsList.Contains(j))
                            {
                                strvalue.Append("‘" + ReadVal.DateStr(writeTable.Rows[i], colsnameList[j]) + "‘");
                            }
                            else
                            { strvalue.Append("‘" + writeTable.Rows[i][colsnameList[j]].ToString() + "‘"); }

                            //if (j < colHeadsList.Count - 1)
                            //{
                                strvalue.Append(",");
                            //}
                           
                        }
                        if (strvalue.Length > 1)
                        {
                            strvalue.Remove(strvalue.Length - 1, 1);
                        }
                        cmd.CommandText = strSQL.Append("insert into [Sheet1]( ")
                            .Append(strfield.ToString())
                            .Append(") values (").Append(strvalue).Append(")").ToString();
                        cmd.ExecuteNonQuery();
                    }
                    con.Close();
                    return true;
                }
            }
            catch (Exception ex)
            {

            }
            return false;
        }
    }

public void getExcel()
{

        //根据查询条件返回DataTable
         DataTable dtchage = 查询返回的DataTable;

string outpathfile = "";
                    if (OutputExcel.exportExcelStream(System.Web.HttpContext.Current.Response,
                        dtchage, new string[] { "Legal", "L2", "部门", "日期", "是否工作日", "员工编号", "姓名", "工时类型", "项目公司", "项目部门", "项目编号", "项目名称", "工时", "状态", "PM", "PL", "填写日期", "确认人", "确认时间 ", "Laborcost", "Source" },
                        new string[] { "LegalEntity", "EmployeeL2", "EmployeeDept", "WorkDate", "IsWorkDay", "EmployeeNo", "EmployeeName", "WorkType", "ProjectLegal", "ProjectDepartment", "ProjectCode", "ProjectName", "Manhour", "TicketState", "PM", "PL", "FillInTime", "Reviewer", "ReviewDate", "LaborCost", "DataSource" },
                        "部门项目-工时查看", "DepartmentProjectTicket", false, new string[] { "WorkDate", "FillInTime" },
                        out outpathfile
                        ))
                    {
                       //导出成功
                    }
}