从Excel、CSV文件获取数据

 #region 从Excel获取数据
        /// <summary>
        /// 从Excel获取数据
        /// </summary>
        /// <param name="Path">文件路径（完整路径）</param>
        /// <returns></returns>
        public static DataSet ReadExcelToDS(string Path)
        {
            DataSet ds = new DataSet();
            OleDbConnection conn = null;
            OleDbDataAdapter da = null;
            try
            {
                //string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties='Excel 8.0;HDR=Yes;IMEX=1';";//此连接只能操作Excel2007之前(.xls)文件
                string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + Path + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'"; //此连接可以操作.xls与.xlsx文件 (支持Excel2003 和 Excel2007 的连接字符串)
                //备注： "HDR=yes;"是说Excel文件的第一行是列名而不是数据，"HDR=No;"正好与前面的相反。
                //      "IMEX=1 "如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。 
                conn = new OleDbConnection(strConn);
                conn.Open();
                DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                if (schemaTable != null)
                {
                    string sheetName = schemaTable.Rows[0]["table_name"].ToString().Trim();
                    if (sheetName != null && sheetName.Length > 0)
                    {
                        string strExcel = "select * from [" + sheetName + "]";
                        da = new OleDbDataAdapter(strExcel, conn);
                        da.Fill(ds);
                    }
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                if (conn != null) conn.Close();
                if (da != null) da.Dispose();
            }
            return ds;
        }
        #endregion

 #region 从CSV文件获取数据
        /// <summary>
        /// 从CSV文件获取数据
        /// </summary>
        /// <param name="Path">文件路径（完整路径）</param>
        /// <returns></returns>
        public static DataSet GetDataSetFromCSV(string Path)
        {
            string filePath = System.IO.Path.GetDirectoryName(Path);
            string fileName = System.IO.Path.GetFileName(Path);
            string strConn = @"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=" + filePath + ";Extensions=asc,csv,tab,txt;";
            DataSet ds = new DataSet();
            OdbcConnection Conn = new OdbcConnection(strConn);
            OdbcDataAdapter da = null;
            try
            {
                Conn.Open();
                DataTable schemaTable = Conn.GetSchema("Tables", null);
                if (schemaTable != null)
                {
                    for (int i = 0; i < schemaTable.Rows.Count; i++)
                    {
                        string sheetName = schemaTable.Rows[i]["table_name"].ToString().Trim();
                        if (fileName == sheetName)
                        {
                            string strSql = "select * from " + sheetName;
                            da = new OdbcDataAdapter(strSql, Conn);
                            da.Fill(ds);
                            break;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                Conn.Close();
                if (da != null) da.Dispose();
            }
            return ds;
        }
        #endregion