在 Global.asax 中给定值的变量有时会返回错误的值

本文关键字：返回 错误 变量 Global asax | 更新日期: 2023-09-27 18:32:29

这是我Global.asax文件：

private static bool ismobile = false;
public static bool IsMobile { get { return ismobile; } }
protected void Application_BeginRequest(object sender, EventArgs e)
    {
        if (Request.Cookies["ismobile"] == null || Request.Cookies["ismobile"].Value == "")
        {
            string u = Request.ServerVariables["HTTP_USER_AGENT"];
            Regex b = new Regex(@"(android|bb'd+|meego).+mobile|avantgo|bada'/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)'/|plucker|pocket|psp|series(4|6)0|symbian|treo|up'.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino", RegexOptions.IgnoreCase);
            Regex v = new Regex(@"1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s'-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|'-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw'-(n|u)|c55'/|capi|ccwa|cdm'-|cell|chtm|cldc|cmd'-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc'-s|devi|dica|dmob|do(c|p)o|ds(12|'-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly('-|_)|g1 u|g560|gene|gf'-5|g'-mo|go('.w|od)|gr(ad|un)|haie|hcit|hd'-(m|p|t)|hei'-|hi(pt|ta)|hp( i|ip)|hs'-c|ht(c('-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i'-(20|go|ma)|i230|iac( |'-|'/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |'/)|klon|kpt |kwc'-|kyo(c|k)|le(no|xi)|lg( g|'/(k|l|u)|50|54|'-[a-w])|libw|lynx|m1'-w|m3ga|m50'/|ma(te|ui|xo)|mc(01|21|ca)|m'-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t('-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)'-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|'-([1-8]|c))|phil|pire|pl(ay|uc)|pn'-2|po(ck|rt|se)|prox|psio|pt'-g|qa'-a|qc(07|12|21|32|60|'-[2-7]|i'-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55'/|sa(ge|ma|mm|ms|ny|va)|sc(01|h'-|oo|p'-)|sdk'/|se(c('-|0|1)|47|mc|nd|ri)|sgh'-|shar|sie('-|m)|sk'-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h'-|v'-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl'-|tdg'-|tel(i|m)|tim'-|t'-mo|to(pl|sh)|ts(70|m'-|m3|m5)|tx'-9|up('.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|'-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c('-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas'-|your|zeto|zte'-", RegexOptions.IgnoreCase);
            if (b.IsMatch(u) || v.IsMatch(u.Substring(0, 4))) ismobile = true; else ismobile = false;
            Response.Cookies["ismobile"].Value = ismobile ? "1" : "0";
        }
        else
        {
            ismobile = Request.Cookies["ismobile"].Value == "1" ? true : false;
        }
    }

在我的页面中，我使用：

bool ismobile = ASP.global_asax.IsMobile;

如果我多次刷新页面，大约 20% 的时间ismobile具有错误的值。相同的系统，相同的代码。可能出了什么问题？

在 Global.asax 中给定值的变量有时会返回错误的值

切勿在 ASP.NET 应用程序中使用 static，因为static变量在所有会话之间共享。该值很可能被打开的另一个会话覆盖。

将其更改为 Session 变量，顾名思义，该变量仅适用于当前会话：

public bool? IsMobile
{
    get
    {
        return HttpContext.Current.Session["ismobile"] as bool?;
    }
    set
    {
        HttpContext.Current.Session["ismobile"] = value;
    }
}
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