第二个：

this.isLoggedIn = (bool)HttpContext.Current.Session["li"];

（布尔）HttpContext.Current.Session [礼] 已经是一个布尔值（所以会为真正或假），因此无需为布尔前pression额外的比较和返回值。

(bool)HttpContext.Current.Session["li"] is already a boolean (so will be either true or false), so no need for the extra comparison and return value of the boolean expression.

无论哪种方式，你需要检查里会话变量尝试投放之前存在，或者您的code将抛出（我觉得的NullReferenceException ）。

Either way, you need to check that the li session variable exists before trying to cast it, or your code will throw (I think a NullReferenceException).