先检查dropdownlist的autopostback属性是否为true，然后加断点，取出sql语句放到sql server里查询是否有返回值，如果在sql server里有返回值，则检查gridview绑定是否出错if (str == "171"){//这里可以不用再次连接数据库了string sql=string.format("SELECT xsk_{0}.xh as 学号,xsk_{0}.xm as 姓名, xsk_{0}.xb as 性别 FROM xsk_{0},xsk_bh where xsk_{0}.bh=xsk_bh.bh ",str);SqlDataAdapter ad1 = new SqlDataAdap...
