C#讀取excel--OLEDB方式

這裏貼的代碼是讀取本地文件系統中的excel

 //讀取EXCEL的方法   (用範圍區域讀取數據)    
        private  static DataTable GetExcelTableByOleDB(string excelFilePath)
        {
            //Excel連接
            OleDbConnection conn = null;
            DataTable dataTable = null;
            try
            {               
                //數據表
                DataSet ds = new DataSet();
                //獲取文件擴展名
                string extension = System.IO.Path.GetExtension(excelFilePath);
                string fileName = System.IO.Path.GetfileName(excelFilePath);
                switch (extension)
                {
                    //HDR=YES,略過第一行數據;IMEX=1,只讀方式打開
                    case ".xls":
                        conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excelFilePath + ";" + "Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1;\"");
                        break;
                    case ".xlsx":
                        conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excelFilePath + ";" + "Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1;\"");
                        break;
                    default:
                        conn = null;
                        break;
                }
                if (conn == null)
                {
                    return null;
                }
                conn.Open();
                //獲取Excel中所有Sheet表的信息
                System.Data.DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                //獲取Excel的第一個Sheet表名
                string tableName = schemaTable.Rows[0][2].ToString().Trim();
                string strSql = "select * from [" + tableName + "]";
                //獲取Excel指定Sheet表中的信息
                OleDbCommand objCmd = new OleDbCommand(strSql, conn);
                OleDbDataAdapter myData = new OleDbDataAdapter(strSql, conn);
                myData.Fill(ds, tableName);//填充數據              
                //dataTable即爲excel文件中指定表中存儲的信息
                dataTable = ds.Tables[tableName];               
            }
            catch(Exception e){
                ExceptionHelper.throwException(e, "解析excel文件出錯");
            }          
            finally
            {
                if (conn != null) { conn.Close(); }
            }
            return dataTable;
        }