不好意思上次问题题目没说清楚
public bool SearchRecord(out SqlDataReader dr)
        {
            SqlCommand sqlCom = new SqlCommand();
             = "select * from student";
            sqlCom.Connection = sqlCon;
            try
            {
                sqlCon.Open();
                dr = sqlCom.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch
            {
                return false;
            }
            return true;
        }
这里执行了catch由于dr没有初始化，因此出现异常，但是sqldatareader怎么才可以初始化，sqldatareader它是个抽象类啊，SqlDataReader dr=new SqlDataReader （）是不正确的代码

            SqlDataReader reader = null;
            try
            {
                reader = com.ExecuteReader();
            }
            catch (Exception)
            {

            }
            while(reader.Read())
            {
              ................
            }

[[it] 本帖最后由 shmilylee 于 2008-10-23 13:43 编辑 [/it]]

收到，多谢