.Net WebApi 使用Session

直接使用Session 会报错“未将对象引用设置到对象的实例”。

解决办法：在Global中添加如下代码

        /// <summary>
        /// 打开session
        /// </summary>
        public override void Init()
        {
            this.PostAuthenticateRequest += (sender, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
            base.Init();
        }

Session帮助类：

 1  public class SessionHelper
 2     {
 3         /// <summary>
 4         /// 写Session
 5         /// </summary>
 6         /// <typeparam name="T">Session键值的类型</typeparam>
 7         /// <param name="key">Session的键名</param>
 8         /// <param name="value">Session的键值</param>
 9         public static void WriteSession<T>(string key, T value)
10         {
11             if (key.Length == 0)
12                 return;
13             HttpContext.Current.Session[key] = value;
14             HttpContext.Current.Session.Timeout = 1;//有效期为1分钟
15         }
16 
17         /// <summary>
18         /// 写Session
19         /// </summary>
20         /// <param name="key">Session的键名</param>
21         /// <param name="value">Session的键值</param>
22         public static void WriteSession(string key, string value)
23         {
24             WriteSession<string>(key, value);
25         }
26 
27         /// <summary>
28         /// 读取Session的值
29         /// </summary>
30         /// <param name="key">Session的键名</param>        
31         public static string GetSession(string key)
32         {
33             if (key.Length == 0)
34                 return string.Empty;
35             return HttpContext.Current.Session[key] as string;
36         }
37 
38         /// <summary>
39         /// 读取Session的值
40         /// </summary>
41         /// <param name="key">Session的键名</param>        
42         public static T GetSession<T>(string key)
43         {
44             if (key.Length == 0)
45                 return default(T);
46             return (T)HttpContext.Current.Session[key];
47         }
48 
49         /// <summary>
50         /// 删除指定Session
51         /// </summary>
52         /// <param name="key">Session的键名</param>
53         public static void RemoveSession(string key)
54         {
55             if (key.Length == 0)
56                 return;
57             HttpContext.Current.Session.Contents.Remove(key);
58         }
59     }

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