记一次使用MemoryCache不能Get的问题

在.NET Core自带的Angular模板项目中，我想要做一个简单的登录认证。

所以想填写用户名密码，使用guid作为key，存储登录信息，每次页面刷新的时候check它。

思路觉得没有问题，但是一直失效，修改前代码：

 1 public class AuthController : Controller
 2   {
 3     private readonly IMemoryCache _cache;
 4     public AuthController(IMemoryCache cache)
 5     {
 6       _cache = cache;
 7     }
 8     [HttpPost]
 9     public IActionResult Post([FromBody]LoginModel model)
10     {
11       if (model != null && model.UserName == "xxxxx" && model.Password == "yyyyyyy")
12       {
13         var token = Guid.NewGuid();
14         var cacheEntryOptions = new MemoryCacheEntryOptions()
15             .SetPriority(CacheItemPriority.NeverRemove)
16             .SetSlidingExpiration(TimeSpan.FromDays(7));
17         _cache.Set(token, model, cacheEntryOptions);
18         return Ok(new { success = true, token = token, model= _cache.Get<LoginModel>(token) });
19       }
20       return Ok(new { success = false, error = "UserName or Password error." });
21     }
22     [HttpGet("check/{token}")]
23     public IActionResult Check(string token)
24     {
25       var model = _cache.Get<LoginModel>(token);
26       if (model != null && model.UserName == "xxxxx" && model.Password == "yyyyyyy")
27       {
28         return Ok(new { success = true, model });
29       }
30       return Ok(new { success = false, model });
31     }
32 
33     public class LoginModel
34     {
35       public string UserName { get; set; }
36       public string Password { get; set; }
37     }
38   }

但是在调用check的api时，就是找不到。

后来发现在set的地方，guid没有ToString，所以导致两次使用过的key不一样。

修改后：

 1   [Route("api/auth")]
 2   public class AuthController : Controller
 3   {
 4     private readonly IMemoryCache _cache;
 5     public AuthController(IMemoryCache cache)
 6     {
 7       _cache = cache;
 8     }
 9     [HttpPost]
10     public IActionResult Post([FromBody]LoginModel model)
11     {
12       if (!model.IsValidUserInfo())
13         return Ok(new { success = false, error = "UserName or Password error." });
14       var token = Guid.NewGuid().ToString();
15       var cacheEntryOptions = new MemoryCacheEntryOptions()
16           .SetPriority(CacheItemPriority.NeverRemove)
17           .SetSlidingExpiration(TimeSpan.FromDays(7));
18       _cache.Set(token, model, cacheEntryOptions);
19       return Ok(new { success = true, token = token });
20     }
21     [HttpGet("check/{token}")]
22     public IActionResult Check(string token)
23     {
24       var model = _cache.Get<LoginModel>(token);
25       return Ok(new { success = model.IsValidUserInfo() });
26     }
27 
28     public class LoginModel
29     {
30       public string UserName { get; set; }
31       public string Password { get; set; }
32     }
33   }
34 
35   public static class extController
36   {
37     public static bool IsValidUserInfo(this AuthController.LoginModel me)
38       => me != null && me.UserName == "xxxx" && me.Password == "yyyy";
39   }