Because I am not wrapping the (Out of Stock!) message in an HTML tag element, Razor can’t implicitly determine that the content within the @if block is the start of a content block.

由于我没有将消息“已售完！” 嵌套在HTML标签元素内，Razor不能隐式判断@if块中的内容是否是一个内容块的开始。

youdao

If a customer likes 1 of the 400 sofas on Davidow's floor, he removes a tag from the item and scans it at a computer to see if it's in stock.

FORBES: Hurry Up And Wait