什么是方形brakets意味着vb.net在这个变量如下定义为[字符串]

 昏暗的客户端作为新的Web客户端（）
昏暗的HTML code以[字符串] = client.DownloadString（http://www.stackoverflow.com）
 

解决方案

这是在你的榜样没用。括号内是有使用保留的关键字，因为他们不是什么，例如：

 暗淡[字符串] =ASDF
 

这将创建一个名为字符串（这是愚蠢的，但...）VAR

What do the square brakets mean in vb.net in this variable below defining as [String]

Dim client As New WebClient()
Dim htmlCode As [String] = client.DownloadString("http://www.stackoverflow.com")

It's useless in your example. Brackets are there to use reserved keywords for what they aren't, for example

Dim [String] = "asdf"

which will create a var named "String" (which is stupid, but...)