读取app.config和web.config 配置信息

config 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
  <connectionStrings>
    <add name="ZQDB" connectionString="server=10.132qwrwe.0wer23.3wre4;database=ZQrewrDBTest; uid=amsfwrwers_ace;pwd=AMweqrsdfS@123456" />
  </connectionStrings>
  <appSettings>
    <add key="key1" value="value1"/>
  </appSettings>
</configuration>

string constr=ConfigurationManager.ConnectionStrings["ZQDB"].ConnectionString;

string value=ConfigurationManager.AppSettings["key1"];