//.方法一：采用OleDB读取EXCEL文件： 

        //打开excel 返回指定表中的所有数据

        public DataSet ExcelToDS(string Path)

        {

            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";

            System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(strConn);

            conn.Open();

            string strExcel = "";

            System.Data.OleDb.OleDbDataAdapter myCommand = null;

            DataSet ds = null;

            strExcel = "select * from [sheet1$]";

            myCommand = new System.Data.OleDb.OleDbDataAdapter(strExcel, strConn);

            ds = new DataSet();

            myCommand.Fill(ds, "table1");

            return ds;

        }

        //对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到

        public DataTable ExcelToDT(string Path)

        {

            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";

            System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(strConn);

            DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);

            string tableName = schemaTable.Rows[][].ToString().Trim();

            return schemaTable;

        }

        //写入excel

        public void DSToExcel(string Path, DataSet oldds)

        {

            //先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构

            string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + Path + ";Extended Properties=Excel 8.0";

            System.Data.OleDb.OleDbConnection myConn = new System.Data.OleDb.OleDbConnection(strCon);

            string strCom = "select * from [Sheet1$]";

            myConn.Open();

            System.Data.OleDb.OleDbDataAdapter myCommand = new System.Data.OleDb.OleDbDataAdapter(strCom, myConn);

            System.Data.OleDb.OleDbCommandBuilder builder = new System.Data.OleDb.OleDbCommandBuilder(myCommand);

            //QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。

            builder.QuotePrefix = "[";     //获取insert语句中保留字符（起始位置）

            builder.QuoteSuffix = "]"; //获取insert语句中保留字符（结束位置）

            DataSet newds = new DataSet();

            myCommand.Fill(newds, "Table1");

            for (int i = ; i < oldds.Tables[].Rows.Count; i++)

            {

                //在这里不能使用ImportRow方法将一行导入到news中，因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。

               // 在使用ImportRow后newds内有值，但不能更新到Excel中因为所有导入行的DataRowState != Added

            DataRow nrow = newds.Tables["Table1"].NewRow();

                for (int j = ; j < newds.Tables[].Columns.Count; j++)

                {

                    nrow[j] = oldds.Tables[].Rows[i][j];

                }

                newds.Tables["Table1"].Rows.Add(nrow);

            }

            myCommand.Update(newds, "Table1");

            myConn.Close();

        }