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操作类    /// </summary>    /// Microsoft Excel 11.0 Object Library    public class ExcelHelper    {        #region 数据导出至Excel文件        /// </summary>         /// 导出Excel文件，自动返回可下载的文件流         /// </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>        /// 导出Excel文件，转换为可读模式        /// </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>        /// 导出Excel文件，并自定义文件名        /// </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>        /// 将数据导出至Excel文件        /// </summary>        /// <param name="Table">DataTable对象</param>        /// <param name="ExcelFilePath">Excel文件路径</param>        public static bool OutputToExcel(DataTable Table, string ExcelFilePath)        {            if (File.Exists(ExcelFilePath))            {                throw new Exception("该文件已经存在！");            }            if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))            {                Table.TableName = "Sheet1";            }            //数据表的列数            int ColCount = Table.Columns.Count;            //用于记数，实例化参数时的序号            int i = 0;            //创建参数            OleDbParameter[] para = new OleDbParameter[ColCount];            //创建表结构的SQL语句            string TableStructStr = @"Create Table " + Table.TableName + "(";            //连接字符串            string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";            OleDbConnection objConn = new OleDbConnection(connString);            //创建表结构            OleDbCommand objCmd = new OleDbCommand();            //数据类型集合            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");            //遍历数据表的所有列，用于创建表结构            foreach (DataColumn col in Table.Columns)            {                //如果列属于数字列，则设置该列的数据类型为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++;            }            //创建Excel文件及文件结构            try            {                objCmd.Connection = objConn;                objCmd.CommandText = TableStructStr;                if (objConn.State == ConnectionState.Closed)                {                    objConn.Open();                }                objCmd.ExecuteNonQuery();            }            catch (Exception exp)            {                throw exp;            }            //插入记录的SQL语句            string InsertSql_1 = "Insert into " + Table.TableName + " (";            string InsertSql_2 = " Values (";            string InsertSql = "";            //遍历所有列，用于插入记录，在此创建插入记录的SQL语句            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;            //遍历数据表的所有数据行            for (int rowID = 0; rowID < Table.Rows.Count; rowID++)            {                for (int colID = 0; colID < ColCount; colID++)                {                    if (para[colID].DbType == DbType.Double && Table.Rows[rowID][colID].ToString().Trim() == "")                    {                        para[colID].Value = 0;                    }                    else                    {                        para[colID].Value = Table.Rows[rowID][colID].ToString().Trim();                    }                }                try                {                    objCmd.CommandText = InsertSql;                    objCmd.ExecuteNonQuery();                }                catch (Exception exp)                {                    string str = exp.Message;                }            }            try            {                if (objConn.State == ConnectionState.Open)                {                    objConn.Close();                }            }            catch (Exception exp)            {                throw exp;            }            return true;        }        /// <summary>        /// 将数据导出至Excel文件        /// </summary>        /// <param name="Table">DataTable对象</param>        /// <param name="Columns">要导出的数据列集合</param>        /// <param name="ExcelFilePath">Excel文件路径</param>        public static bool OutputToExcel(DataTable Table, ArrayList Columns, string ExcelFilePath)        {            if (File.Exists(ExcelFilePath))            {                throw new Exception("该文件已经存在！");            }            //如果数据列数大于表的列数，取数据表的所有列            if (Columns.Count > Table.Columns.Count)            {                for (int s = Table.Columns.Count + 1; s <= Columns.Count; s++)                {                    Columns.RemoveAt(s);   //移除数据表列数后的所有列                }            }            //遍历所有的数据列，如果有数据列的数据类型不是 DataColumn，则将它移除            DataColumn column = new DataColumn();            for (int j = 0; j < Columns.Count; j++)            {                try                {                    column = (DataColumn)Columns[j];                }                catch (Exception)                {                    Columns.RemoveAt(j);                }            }            if ((Table.TableName.Trim().Length == 0) || (Table.TableName.ToLower() == "table"))            {                Table.TableName = "Sheet1";            }            //数据表的列数            int ColCount = Columns.Count;            //创建参数            OleDbParameter[] para = new OleDbParameter[ColCount];            //创建表结构的SQL语句            string TableStructStr = @"Create Table " + Table.TableName + "(";            //连接字符串            string connString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0;";            OleDbConnection objConn = new OleDbConnection(connString);            //创建表结构            OleDbCommand objCmd = new OleDbCommand();            //数据类型集合            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");            DataColumn col = new DataColumn();            //遍历数据表的所有列，用于创建表结构            for (int k = 0; k < ColCount; k++)            {                col = (DataColumn)Columns[k];                //列的数据类型是数字型                if (DataTypeList.IndexOf(col.DataType.ToString().Trim()) >= 0)                {                    para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.Double);                    objCmd.Parameters.Add(para[k]);                    //如果是最后一列                    if (k + 1 == ColCount)                    {                        TableStructStr += col.Caption.Trim() + " Double)";                    }                    else                    {                        TableStructStr += col.Caption.Trim() + " Double,";                    }                }                else                {                    para[k] = new OleDbParameter("@" + col.Caption.Trim(), OleDbType.VarChar);                    objCmd.Parameters.Add(para[k]);                    //如果是最后一列                    if (k + 1 == ColCount)                    {                        TableStructStr += col.Caption.Trim() + " VarChar)";                    }                    else                    {                        TableStructStr += col.Caption.Trim() + " VarChar,";                    }                }            }            //创建Excel文件及文件结构            try            {                objCmd.Connection = objConn;                objCmd.CommandText = TableStructStr;                if (objConn.State == ConnectionState.Closed)                {                    objConn.Open();                }                objCmd.ExecuteNonQuery();            }            catch (Exception exp)            {                throw exp;            }            //插入记录的SQL语句            string InsertSql_1 = "Insert into " + Table.TableName + " (";            string InsertSql_2 = " Values (";            string InsertSql = "";            //遍历所有列，用于插入记录，在此创建插入记录的SQL语句            for (int colID = 0; colID < ColCount; colID++)            {                if (colID + 1 == ColCount)  //最后一列                {                    InsertSql_1 += Columns[colID].ToString().Trim() + ")";                    InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ")";                }                else                {                    InsertSql_1 += Columns[colID].ToString().Trim() + ",";                    InsertSql_2 += "@" + Columns[colID].ToString().Trim() + ",";                }            }            InsertSql = InsertSql_1 + InsertSql_2;            //遍历数据表的所有数据行            DataColumn DataCol = new DataColumn();            for (int rowID = 0; rowID < Table.Rows.Count; rowID++)            {                for (int colID = 0; colID < ColCount; colID++)                {                    //因为列不连续，所以在取得单元格时不能用行列编号，列需得用列的名称                    DataCol = (DataColumn)Columns[colID];                    if (para[colID].DbType == DbType.Double && Table.Rows[rowID][DataCol.Caption].ToString().Trim() == "")                    {                        para[colID].Value = 0;                    }                    else                    {                        para[colID].Value = Table.Rows[rowID][DataCol.Caption].ToString().Trim();                    }                }                try                {                    objCmd.CommandText = InsertSql;                    objCmd.ExecuteNonQuery();                }                catch (Exception exp)                {                    string str = exp.Message;                }            }            try            {                if (objConn.State == ConnectionState.Open)                {                    objConn.Close();                }            }            catch (Exception exp)            {                throw exp;            }            return true;        }        #endregion        /// <summary>        /// 获取Excel文件数据表列表        /// </summary>        public static ArrayList GetExcelTables(string ExcelFileName)        {            DataTable dt = new DataTable();            ArrayList TablesList = new ArrayList();            if (File.Exists(ExcelFileName))            {                using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName))                {                    try                    {                        conn.Open();                        dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });                    }                    catch (Exception exp)                    {                        throw exp;                    }                    //获取数据表个数                    int tablecount = dt.Rows.Count;                    for (int i = 0; i < tablecount; i++)                    {                        string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd(‘$‘);                        if (TablesList.IndexOf(tablename) < 0)                        {                            TablesList.Add(tablename);                        }                    }                }            }            return TablesList;        }        /// <summary>        /// 将Excel文件导出至DataTable(第一行作为表头)        /// </summary>        /// <param name="ExcelFilePath">Excel文件路径</param>        /// <param name="TableName">数据表名，如果数据表名错误，默认为第一个数据表名</param>        public static DataTable InputFromExcel(string ExcelFilePath, string TableName)        {            if (!File.Exists(ExcelFilePath))            {                throw new Exception("Excel文件不存在！");            }            //如果数据表名不存在，则数据表名为Excel文件的第一个数据表            ArrayList TableList = new ArrayList();            TableList = GetExcelTables(ExcelFilePath);            if (TableName.IndexOf(TableName) < 0)            {                TableName = TableList[0].ToString().Trim();            }            DataTable table = new DataTable();            OleDbConnection dbcon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0");            OleDbCommand cmd = new OleDbCommand("select * from [" + TableName + "$]", dbcon);            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);            try            {                if (dbcon.State == ConnectionState.Closed)                {                    dbcon.Open();                }                adapter.Fill(table);            }            catch (Exception exp)            {                throw exp;            }            finally            {                if (dbcon.State == ConnectionState.Open)                {                    dbcon.Close();                }            }            return table;        }        /// <summary>        /// 获取Excel文件指定数据表的数据列表        /// </summary>        /// <param name="ExcelFileName">Excel文件名</param>        /// <param name="TableName">数据表名</param>        public static ArrayList GetExcelTableColumns(string ExcelFileName, string TableName)        {            DataTable dt = new DataTable();            ArrayList ColsList = new ArrayList();            if (File.Exists(ExcelFileName))            {                using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName))                {                    conn.Open();                    dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, TableName, null });                    //获取列个数                    int colcount = dt.Rows.Count;                    for (int i = 0; i < colcount; i++)                    {                        string colname = dt.Rows[i]["Column_Name"].ToString().Trim();                        ColsList.Add(colname);                    }                }            }            return ColsList;        }    }}