c# - 如何在 global.asax 中设置默认的 cookie 值？

Question

我想为每个访问该网站的用户创建一个 cookie 并为其设置一个默认值。 cookie 用于以英语启动网站，之后用户可以根据自己的喜好更改语言。

我在 global.asax 中这样做

        HttpCookie myCookie = new HttpCookie("Language"); 
        myCookie.Value = "EN";
        myCookie.Expires = DateTime.Now.AddDays(1d);
        HttpContext.Current.Response.Cookies.Add(myCookie);

我尝试在以下事件中使用上面的代码，

Application_Start
Application_BeginRequest
Session_Start

在上述所有三个事件中，为每次页面加载将 cookie 值设置为“EN”。事实并非如此。当用户选择其他语言时，语言必须设置为 HttpCookie("Language")。

Answer 1

你应该首先检查cookie是否还没有被定义..它是否已经设置你不需要再次设置它..当用户选择一种新的语言时，然后你才应该重新定义它.. . 一般算法和操作顺序是这样的

• if user is changing language
  • change the language of the application to the chosen
  • save it to cookie
• else if the previous setting as been preserved in cookie
  • change the language of the application to the preserved
• else then is new visit
  • change the language of the application to the default
  • set cookie to the default

这应该在每个请求中进行评估..因为用户可以在任何页面更改语言..所以放置代码的正确事件应该是 Application_BeginRequest

这是您的代码。我将语言参数保存在 CurrentUICulture 中，因此不仅可以在应用程序的任何位置查询它，而且框架还使用它来自定义格式。 .我还假设用户可以传递一个名为 lang 的参数，其中包含他想要的语言..

void Application_BeginRequest(object sender, EventArgs e) 
{
    //if user is changing language
    if(!String.IsNullOrEmpty(HttpContext.Current.Request["lang"]))
    {
        String sLang =  HttpContext.Current.Request["lang"] as String;
        //change the language of the application to the chosen
        System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo(sLang);
        //save it to cookie
        HttpCookie myCookie = new HttpCookie("Language"); 
        myCookie.Value = sLang;
        myCookie.Expires = DateTime.Now.AddDays(1d);
        HttpContext.Current.Response.Cookies.Add(myCookie);
    }
    //setting as been preserved in cookie
    else if(HttpContext.Current.Request.Cookies["Language"])
    {
        //change the language of the application to the preserved
        String sLang =  HttpContext.Current.Request.Cookies["lang"].value as String;
        System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo(sLang);
    }
    else//new visit
    {
        //change the language of the application to the default
        System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-us");
        //set cookie to the default
        HttpCookie myCookie = new HttpCookie("Language"); 
        myCookie.Value = "en-us";
        myCookie.Expires = DateTime.Now.AddDays(1d);
        HttpContext.Current.Response.Cookies.Add(myCookie);
    }
}