请参阅在Web.Config和应用程序中读取连接字符串.Config和企业库DAAB设置（在原始被删除的Wayback Machine上）

Please see Reading Connection Strings in Web.Config and App.Config and Enterprise Library DAAB Settings (on the Wayback Machine as the original got deleted)

ConnectionStringSettings connection = ConfigurationManager.ConnectionStrings["MyConnectionString"]
string connectionString = connection.ConnectionString

添加程序集引用 System.Configuration