原文件:

<applicationSettings>
    <AppName.My.MySettings>
        <setting name="setting1" serializeAs="String">
            <value>Initial Value</value>
        </setting>
    </AppName.My.MySettings>
</applicationSettings>

转换文件:

 <applicationSettings>
   <AppName.My.MySettings>
      <setting name="setting1" serializeAs="String">
           <value xdt:Transform="Replace">Changed Value</value>
       </setting>
    </AppName.My.MySettings>
  </applicationSettings>