加载DLL时动态加载app.config

Question

我的DLL正由另一个exe加载。 DLL使用Nuget上托管的库，例如Autofac, Autofac.WebApi2.

我的app.config看起来像这样

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Autofac" publicKeyToken="17863af14b0044da" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.5.0.0" newVersion="3.5.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

加载我的DLL时，我收到以下错误消息

 "Could not load file or assembly 'System.Web.Http, Version=5.2.0.0, Culture=neutral, PublicKeyToken={token}' or one of its dependencies..."

app.config也部署到与名为exe的{​​{1}}相同的目录中。如何动态加载此配置，以便它使用程序集绑定？