读取App.config文件中的内容

1. 读取connectionstringApp.config:<configuration>  <!--数据库连接字符串-->  <connectionStrings>    <add name="ConnectionToNorthwind" connectionString="Data Source=localhost;Initial Catalog=Northwind;UserID=sa;password=sa"         providerName="System.Data.SqlClient"/>  </connectionStrings></configuration>读取方法：private static string GetConnectionString(string connectionName){    return ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();}2. 读取settingStringApp.config:<appSettings>    <add key="ConnectionString" value="server=127.0.0.1;uid=sa;pwd=xx;database=test"/></appSettings>读取方法：System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];