是否需要手动关闭并处置SqlDataReader？

尽量避免使用这样的读者：

SqlConnection connection = new SqlConnection("connection string");SqlCommand cmd = new SqlCommand("SELECt * FROM Sometable", connection);SqlDataReader reader = cmd.ExecuteReader();connection.Open();if (reader != null){      while (reader.Read())      {   //do something      }}reader.Close(); // <- too easy to forgetreader.Dispose(); // <- too easy to forgetconnection.Close(); // <- too easy to forget

相反，将它们包装在using语句中：

using(SqlConnection connection = new SqlConnection("connection string")){    connection.Open();    using(SqlCommand cmd = new SqlCommand("SELECt * FROM Sometable", connection))    {        using (SqlDataReader reader = cmd.ExecuteReader())        { if (reader != null) {     while (reader.Read())     {         //do something     } }        } // reader closed and disposed up here    } // command disposed here} //connection closed and disposed here

using语句将确保正确处置对象和释放资源。

如果您忘记了，则将清理工作留给垃圾收集器，这可能需要一段时间。