从WebForms迁移到MVC - 使用常见母版页的主题问题

I'm in the middle of migrating from an WebForms app to an MVC app. Since this needs to be done over time, WebForms and MVC will live side-by-side with all new pages in MVC and we will slowly transition existing pages to MVC over time.I'm in the middle of migrating from an WebForms