configurationmanager是什么意思

configurationmanager是什么意思 ConfigurationManager.AppSettings[conStr]是什么意思? ConfigurationManager.AppSettings[conStr]是什么意思? string strconn = ConfigurationManager.AppSettings[connStr];是啥意思string strconn = ConfigurationManager.AppSettings[connStr]; SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[SQLCONNECTIONSTRING].ConnectionString); Unable to load configuration.- action - file:/E:/apache-tomcat-6.0.28/webapps/Struts2_2000_OGNL/WEB-INF/classes/com/byg/struts/ognl/action/ognl.xml:7:75at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java: 为什么这么简单的问题我都不会?string str = System.Configuration.ConfigurationManager.AppSettings[sqlConnString]; SqlConnection sc = new SqlConnection(str); sc.Open(); string sqls = insert into teacher_info_north(teacher 请问每句代码的意思是什么?public SqlDataReader GetmySend(string username){SqlConnection myConnection = new SqlConnection(ConfigurationManager.AppSettings[MySQLConn]);string cmdText = SELECT * FROM send where name='+username+' ORDER BY