Question

我有一个asp.net Web应用程序，其中一个下拉框包含语言首选项（英语，法语）。当我选择法语时，我会将cookie写成以下内容 -

protected void ddChoice_SelectedIndexChanged(object sender, EventArgs e)
    {
        HttpCookie cookie = new HttpCookie("pref");
        cookie.Value = ddChoice.SelectedValue;
        cookie.Expires = DateTime.Now.AddYears(1);
        Response.SetCookie(cookie);
        Thread.CurrentThread.CurrentCulture = new CultureInfo(ddChoice.SelectedValue);
        Thread.CurrentThread.CurrentUICulture = new CultureInfo(ddChoice.SelectedValue);           
        Server.Transfer(Request.Path);
    }

并在开始请求中阅读此cookie，如下所示 -

      protected void Application_BeginRequest(object sender, EventArgs e)
       {

            string lang = string.Empty;//default to the invariant culture
            HttpCookie cookie = Request.Cookies["pref"];

           if (cookie != null && cookie.Value != null && !string.IsNullOrEmpty(cookie.Value.Trim()))
            lang = cookie.Value;

        if (string.IsNullOrEmpty(lang))
            lang = "en-US"; 

        Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo(lang);
        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(lang);
      }

这次如果我检查浏览器cookie，它会被正确设置为“fr-FR”。但在此之后，当我转到主页并刷新此页面时，cookie将设置为空白。

我不确定它会被覆盖的地方。有什么帮助吗？

Answer 1

我认为ddChoice_SelectedIndexChanged事件是使用空SelectedValue生成的，因此您的Cookie为空。尝试将断点放在方法中或将其注释掉。

Answer 2

作为步骤4中的测试用例，当您点击F5页面时，获得回发并使用默认的顶级语言设置语言的语言下拉列表。

为此，您需要在控件或页面中编写一个函数，其中放置了您设置选定语言的语言下拉列表。

protected void Page_Load(object sender, EventArgs e)
    {
      if (!Page.IsPostBack)
      {
        setLangDropdown();
      }
}
private void setLangDropdown()
{
    HttpCookie cookie = Request.Cookies["pref"];
    string lang = string.Empty;

    if (cookie != null && cookie.Value != null && !string.IsNullOrEmpty(cookie.Value.Trim()))
        lang = cookie.Value;

    if (!string.IsNullOrEmpty(lang))
        ddChoice.SelectedValue = lang;  
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    HttpCookie cookie = new HttpCookie("pref");
    cookie.Value = ddChoice.SelectedValue;
    cookie.Expires = DateTime.Now.AddYears(1);
    Response.SetCookie(cookie);
    Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo(ddChoice.SelectedValue);
    Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(ddChoice.SelectedValue);



    }

asp.net cookies被覆盖了

2 个答案: