C#获取资源文件夹中的完整路径

AppDomain.CurrentDomain.BaseDirectory + 
ConfigurationManager.AppSettings["数据库文件路径"];

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
    </startup>
  <appSettings>
    <add key="数据库文件路径" value="..\..\Resources\UDFDataWithModule.xml"/>
  </appSettings>
</configuration>