c# - 如何在c#方法中设置一个全局变量

Question

我尝试将 currenturl 分配给 SiteName(全局变量)，但在更改为新方法时 SiteName(全局变量)得到空值。 有人可以帮忙吗？

public string SiteName;

public ActionResult Admin()
{
   string currentUrl = HttpContext.Request.Url.Segments.Last();

   SiteName = currentUrl;         

   return View();

}

Answer 1

由于您使用的是 asp:有一个 Session和 Application为此目的的对象:

public ActionResult Admin()
{
   string currentUrl = HttpContext.Request.Url.Segments.Last();

   //per session (let's say: per user)
   //you can read and write to this variable
   Session["SiteName"] = currentUrl;   

   //"global" variables: for all users
   HttpContext.Application["SiteName"] = currentUrl;

   return View();
}

您可以在有权访问 httpcontext 的整个应用程序中以相同的方式检索它。

public ActionResult Foo()
{
   //per session (let's say: per user)
   //you can read and write to this variable
   var currentUrl = Session["SiteName"];   

   //or

   //"global" variables: for all users
   currentUrl = HttpContext.Application["SiteName"];

   return View();
}