C#讀取excel表格

static void Main(string[] args) {
            string fileName = "111.xls";
            string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
            //string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\""; // 對應xlsx

            // 創建連接到數據源的對象
            OleDbConnection connection = new OleDbConnection(connectionString);

            // 打開接連
            connection.Open();

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

            OleDbDataAdapter adapter = new OleDbDataAdapter(sql,connection);
            // 用來存放DataTable
            DataSet dataSet = new DataSet();

            // 把查詢結果(DataTable)放到dataSet裏
            adapter.Fill(dataSet);

            // 釋放連接
            connection.Close();

            // 獲取當前集合中的所有表格
            DataTableCollection tableCollection = dataSet.Tables;

            // 因爲我們只往dataset裏放置一張表格,所以這裏取得索引爲0表格就是我們剛剛查詢到的表格
            DataTable table = tableCollection[0];

            // 取得表格中的所有行
            DataRowCollection rowCollection = table.Rows;

            // 遍歷所有的行
            foreach (DataRow row in rowCollection) {
                // 取得前8列數據
                for (int i = 0; i < 3; i++) {
                    Console.Write(row[i] + " ");
                }
                Console.WriteLine();
            }

            Console.ReadKey();
        }