OleDb方式读取excel到DataTable

private DataTable LoadDataTableFromExcel(string filePath)
        {
            try
            {
                string strConn;
                if ("xlsx".Equals(Path.GetExtension(filePath).Substring(1), StringComparison.OrdinalIgnoreCase))
                    strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties='Excel 12.0;HDR=No;IMEX=1;'";
                else
                    strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=No;IMEX=1;'";

                //链接Excel
                OleDbConnection cnnxls = new OleDbConnection(strConn);
                cnnxls.Open();
                DataTable schemaTable = cnnxls.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                string tableName = schemaTable.Rows[0][2].ToString().Trim();

                //读取Excel里面有 表tableName
                OleDbDataAdapter oda = new OleDbDataAdapter("select * from [" + tableName + "]", cnnxls);
                DataSet ds = new DataSet();
                //将Excel里面有表内容装载到内存表中！
                oda.Fill(ds);
                DataTable dt = ds.Tables[0];
                return dt;
            }
            catch (Exception)
            {
                throw;
            }
        }