C# 从 Cookie 读取无效的 JSON 基元

Question

我正在使用 JQuery.Cookie 将 javascript 对象存储为 cookie 值:

    var refinerData = {};
// Read in the current cookie if it exists:
if ($.cookie('RefinerData') != null) {
    refinerData = JSON.parse($.cookie('RefinerData'));
}
// Set new values based on the category and filter passed in
switch(category)
{
    case "topic":
        refinerData.Topic = filterVal;
        break;
    case "class":
        refinerData.ClassName = filterVal;
        break;
    case "loc":
        refinerData.Location = filterVal;
        break;
}    
// Save the cookie:
$.cookie('RefinerData', JSON.stringify(refinerData), { expires: 1, path: '/' });

当我在 firebug 中调试时，cookie 值的值似乎格式正确:

{"Topic":"Disease Prevention and Management","Location":"Hatchery Hill Clinic","ClassName":"我有糖尿病，我可以吃什么？"

我正在用 C# 编写一个 SharePoint web 部件，用于读取 cookie 并对其进行解析:

        protected void Page_Load(object sender, EventArgs e)
    {
        HttpCookie cookie = HttpContext.Current.Request.Cookies["RefinerData"];
        if (cookie != null)
        {
            string val = cookie.Value;
            // Deserialize JSON cookie:
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            var refiners = serializer.Deserialize<Refiners>(cookie.Value);
           output.AppendLine("Deserialized Topic = " + refiners.Topic);
            output.AppendLine("Cookie exists: " + val);
        }
    }

我有一个用于序列化的 Refiners 类:

    public class Refiners
{
    public string Topic { get; set; }
    public string ClassName { get; set; }
    public string Location { get; set; }
}   

但是，此代码会引发“无效的 JSON 原语”错误。我不明白为什么这不起作用。一种可能是它没有正确读取 cookie。当我将 cookie 的值作为字符串打印出来时，我得到:

%7B%22Topic%22%3A%22Disease%20Prevention%20and%20Management%22%2C%22Class%22%3A%22Childbirth%20%26%20Parenting%202013%22%2C%22Location%22%3A% 22GHC%20East%20Clinic%22%7D

Answer 1

出现 URL 编码，尝试使用 UrlDecode 解码值HtmlUtility 的方法(其中一个实例由页面通过 Server 属性公开):

var refiners = serializer.Deserialize<Refiners>(Server.UrlDecode(cookie.Value));