C# 获取配置文件的值(含获取其他项目配置文件值)

1.配置文件Config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="xxxx" value ="12345"/>
  </appSettings>
</configuration>

2.获取key值

同一项目，可以直接取值

private static string xxxx = ConfigurationManager.AppSettings["xxxx"].ToString();

不同项目，配置路径访问

ExeConfigurationFileMap exc= new ExeConfigurationFileMap();

//设置路径，选一种即可
exc.ExeConfigFilename = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "Config.config";  
exc.ExeConfigFilename =  @"D:\Config";

Configuration AppConfig = ConfigurationManager.OpenMappedExeConfiguration(exc, ConfigurationUserLevel.None);
//取值
string xxxx = AppConfig.AppSettings.Settings["xxxx"].Value;