通用配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section 
            name="appSettings" 
            type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" 
            />
    </configSections>
    <appSettings>
        <add key="key1" value="value1"/>
    </appSettings>
</configuration>

访问映射的配置文件

ConfigurationFileMap fileMap = new ConfigurationFileMap(file); //Path to your config file
Configuration configuration = ConfigurationManager.OpenMappedMachineConfiguration(fileMap);
string value = configuration.AppSettings.Settings["key1"].Value;