using System;using System.IO;using System.Data;using System.Collections;using System.Data.OleDb;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace DotNet.Utilities{    /// <summary>    /// Excel操作類    /// </summary>    /// Microsoft Excel 11.0 Object Library    public class ExcelHelper    {        #region 數據導出至Excel文件        /// </summary>         /// 導出Excel文件，自動返回可下載的文件流         /// </summary>         public static void DataTable1Excel(System.Data.DataTable dtData)        {            GridView gvExport = null;            HttpContext curContext = HttpContext.Current;            StringWriter strWriter = null;            HtmlTextWriter htmlWriter = null;            if (dtData != null)            {                curContext.Response.ContentType = "application/vnd.ms-excel";                curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");                curContext.Response.Charset = "utf-8";                strWriter = new StringWriter();                htmlWriter = new HtmlTextWriter(strWriter);                gvExport = new GridView();                gvExport.DataSource = dtData.DefaultView;                gvExport.AllowPaging = false;                gvExport.DataBind();                gvExport.RenderControl(htmlWriter);                curContext.Response.Write("<meta http-equiv=/"Content-Type/" content=/"text/html;charset=gb2312/"/>" + strWriter.ToString());                curContext.Response.End();            }        }        /// <summary>        /// 導出Excel文件，轉換為可讀模式        /// </summary>        public static void DataTable2Excel(System.Data.DataTable dtData)        {            DataGrid dgExport = null;            HttpContext curContext = HttpContext.Current;            StringWriter strWriter = null;            HtmlTextWriter htmlWriter = null;            if (dtData != null)            {                curContext.Response.ContentType = "application/vnd.ms-excel";                curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;                curContext.Response.Charset = "";                strWriter = new StringWriter();                htmlWriter = new HtmlTextWriter(strWriter);                dgExport = new DataGrid();                dgExport.DataSource = dtData.DefaultView;                dgExport.AllowPaging = false;                dgExport.DataBind();                dgExport.RenderControl(htmlWriter);                curContext.Response.Write(strWriter.ToString());                curContext.Response.End();            }        }        /// <summary>        /// 導出Excel文件，并自定義文件名        /// </summary>        public static void DataTable3Excel(System.Data.DataTable dtData, String FileName)        {            GridView dgExport = null;            HttpContext curContext = HttpContext.Current;            StringWriter strWriter = null;            HtmlTextWriter htmlWriter = null;            if (dtData != null)            {                HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);                curContext.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");                curContext.Response.ContentType = "application nd.ms-excel";                curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;                curContext.Response.Charset = "GB2312";                strWriter = new StringWriter();                htmlWriter = new HtmlTextWriter(strWriter);                dgExport = new GridView();                dgExport.DataSource = dtData.DefaultView;                dgExport.AllowPaging = false;                dgExport.DataBind();                dgExport.RenderControl(htmlWriter);                curContext.Response.Write(strWriter.ToString());                curContext.Response.End();            }        }        /// <summary>        /// 將數據導出至Excel文件        /// </summary>        /// <param name="Table">DataTable對象</param>        /// <param name="ExcelFilePath">Excel文件路徑</param>        public static bool OutputToExcel(DataTable Table, string ExcelFilePath)        {            if (File.Exists(ExcelFilePath))            {                throw new Exception("該文件已經存在！");            }            if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))            {                Table.TableName = "Sheet1";            }            //數據表的列數            int ColCount = Table.Columns.Count;            //用于記數，實例化參數時的序號            int i = 0;            //創建參數            OleDbParameter[] para = new OleDbParameter[ColCount];            //創建表結構的SQL語句            string TableStructStr = @"Create Table " + Table.TableName + "(";            //連接字符串            string connString = @"PRovider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";            OleDbConnection objConn = new OleDbConnection(connString);            //創建表結構            OleDbCommand objCmd = new OleDbCommand();            //數據類型集合            ArrayList DataTypeList = new ArrayList();            DataTypeList.Add("System.Decimal");            DataTypeList.Add("System.Double");            DataTypeList.Add("System.Int16");            DataTypeList.Add("System.Int32");            DataTypeList.Add("System.Int64");            DataTypeList.Add("System.Single");            //遍歷數據表的所有列，用于創建表結構            foreach (DataColumn col in Table.Columns)            {                //如果列屬于數字列，則設置該列的數據類型為double                if (DataTypeList.IndexOf(col.DataType.ToString()) >= 0)                {                    para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.Double);                    objCmd.Parameters.Add(para[i]);                    //如果是最后一列                    if (i + 1 == ColCount)                    {                        TableStructStr += col.ColumnName + " double)";                    }                    else                    {                        TableStructStr += col.ColumnName + " double,";                    }                }                else                {                    para[i] = new OleDbParameter("@" + col.ColumnName, OleDbType.VarChar);                    objCmd.Parameters.Add(para[i]);                    //如果是最后一列                    if (i + 1 == ColCount)                    {                        TableStructStr += col.ColumnName + " varchar)";                    }                    else                    {                        TableStructStr += col.ColumnName + " varchar,";                    }                }                i++;            }            //創建Excel文件及文件結構            try            {                objCmd.Connection = objConn;                objCmd.CommandText = TableStructStr;                if (objConn.State == ConnectionState.Closed)                {                    objConn.Open();                }                objCmd.ExecuteNonQuery();            }            catch (Exception exp)            {                throw exp;            }            //插入記錄的SQL語句            string InsertSql_1 = "Insert into " + Table.TableName + " (";            string InsertSql_2 = " Values (";            string InsertSql = "";            //遍歷所有列，用于插入記錄，在此創建插入記錄的SQL語句            for (int colID = 0; colID < ColCount; colID++)            {                if (colID + 1 == ColCount)  //最后一列                {                    InsertSql_1 += Table.Columns[colID].ColumnName + ")";                    InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ")";                }                else                {                    InsertSql_1 += Table.Columns[colID].ColumnName + ",";                    InsertSql_2 += "@" + Table.Columns[colID].ColumnName + ",";                }            }            InsertSql = InsertSql_1 + InsertSql_2;            //遍歷數據表的所有數據行            for (int rowID = 0; rowID < Table.Rows.Count; rowID++)            {                for (int colID = 0; colID < ColCount; colID++)                {                    if (para[colID].DbType == DbType.Double &&