如果我在using块中实例化一个sqlDataReader,我是否需要在阅读器上调用close()?
using (var connection = new sqlConnection(Settings.GetValue("sqlConnection"))) { sqlCommand command = new sqlCommand("select * from Users where Id = @Id",connection); command.Parameters.Add("@Id",sqlDbType.UniqueIdentifier); command.Parameters["@Id"].Value = id; using (sqlDataReader reader = command.ExecuteReaderWithRetry()) { reader.Read(); if (reader.HasRows) { //Do work } //Is this neccesary? reader.Close(); } }