asp.net Syntax [] instead of ()

Question

有人可以解释一下为什么在下面的单行代码（ASP.NET后面的C＃代码）中使用括号而不是（），并提供此语法的技术文档参考吗？

string cssFile = Request.Cookies["InquiryId"].Value;

Answer 1

You may take a look at indexed properties . That's what is defined for the Cookies property.

Answer 2

您正在查看的[]语法称为索引器 （msdn链接）。

Answer 3

它的ac＃而不是用于访问数组的VB.Net约定，实际上与asp.net无关，而是背后代码的语言选择

Answer 4

Because Cookies is some kind of dictionary. Or more general: It defines an indexer property. Therefor the [] have to be used. () are used for a method call, which is just something different.