为什么New <type> With {}有效但New With {}没有？</type>

Question

我总是使用New With {}而没有任何问题。为什么会有所不同？

Razor VB.NET代码

Using Ajax.BeginForm(New AjaxOptions With {.HttpMethod = "Post"})
    @* no problem *@
End Using

Using Ajax.BeginForm(New With {.HttpMethod = "Post"})
    @* Value of type '<anonymous type>' cannot be converted to 'System.Web.Mvc.Ajax.AjaxOptions'. *@
End Using

Answer 1

anonymous type（New With {}）不会延伸/继承AjaxOptions - 符合AjaxOptions的对象必需 {{1 }}