C# 持久性 cookie

Question

我已经在 stackoverflow 上看到了 ASP.NET MVC C# 中的持久性 cookie 示例。但我不明白为什么下面的代码不起作用。

首先我写入cookie:

HttpCookie cookie = new HttpCookie("AdminPrintModule");
cookie.Expires = DateTime.Now.AddMonths(36);

cookie.Values.Add("PrinterSetting1", Request.QueryString["Printer1"]);
cookie.Values.Add("PrinterSetting2", Request.QueryString["Printer2"]);
cookie.Values.Add("PrinterSetting3", Request.QueryString["Printer3"]);

Response.Cookies.Add(cookie);

我看到存储在 Internet Explorer 中的 cookie。内容看起来不错。

然后是读取代码:

HttpCookie cookie = Request.Cookies["AdminPrintModule"];
test = cookie.Values["PrinterSetting2"].ToString();

cookie 变量保持为 null 。在测试变量中存储 PrinterSetting2 值失败。

我不知道我做错了什么，因为这或多或少是从 stackoverflow 上的示例中复制粘贴的。为什么我无法从 cookie 中读取 PrinterSetting2 值？

Answer 1

试试下面的代码:-

if (Request.Cookies["AdminPrintModule"] != null)
{
    HttpCookie cookie = Request.Cookies["AdminPrintModule"];
    test = cookie["PrinterSetting2"].ToString();
}

看看这个文档http://www.c-sharpcorner.com/uploadfile/annathurai/cookies-in-Asp-Net/ :-

以下是几种写入和读取 cookie 的类型:-

Non-Persist Cookie - A cookie has expired time Which is called as Non-Persist Cookie

How to create a cookie? Its really easy to create a cookie in the Asp.Net with help of Response object or HttpCookie

Example 1:

    HttpCookie userInfo = new HttpCookie("userInfo");
    userInfo["UserName"] = "Annathurai";
    userInfo["UserColor"] = "Black";
    userInfo.Expires.Add(new TimeSpan(0, 1, 0));
    Response.Cookies.Add(userInfo);

Example 2:

    Response.Cookies["userName"].Value = "Annathurai";
    Response.Cookies["userColor"].Value = "Black";

How to retrieve from cookie?

Its easy way to retrieve cookie value form cookes by help of Request object. Example 1:

    string User_Name = string.Empty;
    string User_Color = string.Empty;
    User_Name = Request.Cookies["userName"].Value;
    User_Color = Request.Cookies["userColor"].Value;

Example 2:

    string User_name = string.Empty;
    string User_color = string.Empty;
    HttpCookie reqCookies = Request.Cookies["userInfo"];
    if (reqCookies != null)
    {
        User_name = reqCookies["UserName"].ToString();
        User_color = reqCookies["UserColor"].ToString();
    }