关于[Building Hierarchical Dropdown Lists in ASP.NET Core 3.1 Razor Pages with View Models and Ajax]的摘要:
By building the case study project you’ll learn how to create a web application that populates a user interface dropdown list based on the value selected in another dropdown list. Option values for the dropdown lists will come from a database at runtime.
原文地址: https://www.twilio.com/blog/dropdown-lists-aspnet-core-razor-pages-view-models-ajax