ExcelHelper

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;

        }

    }

}