＆是在cookie中不是允许的字符。这是必要的EN code用的 UrlEn code 方法。

The ampersand is not an allowed character in a cookie. It's necessary to encode the cookie data with the UrlEncode method.

System.Web.HttpUtility.UrlEncode(cookie);

也看到这些做题/答案：

See also these SO questions/answers:

• Broken字符串中的cookie之后符号（JavaScript）的


• How你在VB.NET的使用的HttpCookie and符？

• Broken string in cookie after ampersand (javascript)
• How do you use an Ampersand in an HTTPCookie in VB.NET?