Question

我们的项目中有一个包含缓存信息的类：

public class SOLECache
{
    public DateTime CreatedDTM { get; set; }
    public int UserID { get; set; }
    public int MaxAgeSeconds { get; set; }
    public object Data { get; set; }
}

where属性Data保存我们想要缓存的对象，可以是任何类型。因为我们有一个包含多个Web服务器的生产环境，所以我们尝试使用Redis和ServiceStack来处理缓存。现在缓存已正确存储在Redis服务器上，该部分工作正常。问题在于，当我们尝试获取缓存时：

 _cacheClient.Get<AppUser>("someCacheKey");

我们总是为Data属性获取NULL值。所以基本上很明显，数据是在正确的密钥下存储在Redis服务器上的，但是当我们检索它时，除了Data属性之外，我们得到的一切都是NULL。

任何人都可以给我任何见解，为什么会这样？可能是因为我们存储在data属性中的对象有一些只读属性和一些方法 - 它不是一个干净的POCO？以下是存储对象的示例结构：

public class AppUser
{ 
   public int UserId {get; set;}
   public string FirstName {get; set;}
   public string LastName {get; set;}
   public string FullName
   {
      get {
         return FirstName + " " + LastName;
      }
   }
   public void DoSomething()
   {
      // some method logic here...
   }
}

此类是否可能导致ServiceStack.RedisClient无法正确序列化AppUser实例？

我们在Redis中设置缓存的方式是：

_cacheClient.Set("someCacheKey", soleCache, DateTime.UtcNow.AddSeconds(soleCache.MaxAgeSeconds))

其中soleCache是SOLECache的一个实例，带有填充的Data属性。存储在Redis上的数据如下：

{"CreatedDTM":"2013-06-28T13:45:56.5091664-04:00","UserID":123,"MaxAgeSeconds":60,"Data":{"FullName":"John M Doe","FirstName":"John","MiddleName":"M","LastName":"Doe","Email":"me@here.com","BackupEmail":"me@there.com","GradYear":null,"PostalCode":"12345     ","Location":"12345     ","City":null,"IsValid":true,"Active":true,"AccessLevel":10,"CurrentApp":0,"CurrentURL":"http://localhost:4387/","RequestMethod":"GET","IsMobile":false,"IsInApp":false,"ServerName":"ITSWEB-JMDOE","ID":40117,"IsAdmin":true,"Theme":"basic","ExpirationDT":null,"WebFolderName":"jmdoe","ProgramCD":null,"BranchCD":"MBIM","RoleOverride":0,>"CurrentAppRoleID":0,"EnableNativeMailFLG":false,"PasswordStatus":"GOOD","CampusCD":"M","Campus":"Smallville","DisclaimerDate":"2012-07-02T10:55:54.297","SecurityQuestion":null,"ClassificationMSK":4,"IsLinkedToCurrentApp":false,"IsBlockedFromCurrentApp":false,"IsBlockedMessageText":null,"CurrentAppRoleName":null,"AssignedAppRoleID":0,"AppSmallGroup":0,"PermissionsArray":[],"AdminPermissionsArray":[],"ViewLevel":[],"LastLoginDTM":"2013-06-27T16:28:23.21","Session":{"SessionID":"1923dac2-f3af-4dc5-ad51-7202fc077ba3","SessionCreatedDTM":"2013-06-28T09:03:13.12","SessionTimeout":60,"SessionUserID":40117,"SessionCurrentApp":0,"SessionLastViewDTM":"2013-06-28T13:24:37.69","SessionUserAgent":"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36","SessionIP":"127.0.0.1","SessionLastURL":"http://localhost:4387/Home/CacheInfo","SessionServer":"ITSWEB-JMDOE","LastLoginDTM":null,"SessionLoginMethod":null,"ADUserName":null,"ADPassword":null,"Errors":{},"HasErrors":false,"ModelState":{}},"CurrentInstanceID":0,"CurrentPageHasNotes":false,"CurrentPageIsFavorited":false,"BrowserBrand":"Chrome","BrowserVersion":"28.0","BrowserPlatform":"Windows 8","BrowserValid":true,"Favorites":[],"FullNameWithEmail":"John M Doe (jmdoe@here.com)","FullNameWithoutMiddleName":"John Doe","IsStudent":true,"Errors":{},"HasErrors":false,"ModelState":{}}}

我们已将问题追溯到ServiceStack.Text.JsonSerializer方法，该方法由于某种原因未正确序列化此对象。当我们用NewtonSoft的Json Serializer替换这个方法时，它运行正常......似乎是ServiceStack的问题，但我可能错了......

Answer 1

我们总是为Data属性获取NULL值。
因此，看起来您正在向缓存中插入SOLECache类型的对象（来自问题：其中soleCache是SOLECache的实例，带有填充的数据属性。）
并且，您希望将数据从缓存中提取到类型AppUser（来自问题： _cacheClient.Get<AppUser>("someCacheKey"); ）也许这只是一个错字（我没有看到AppUser上的数据属性），但切换类型可能是问题。

您应该能够插入缓存类型SOLECache并输出类型SOLECache。只要您有JsConfig.ExcludeTypeInfo = false;（这是默认值），它就应该使用正确的类型填充Data属性。看起来你可能有JsConfig.ExcludeTypeInfo = true;因为我没有在Redis中存储的数据中看到__type字段（这就是ServiceStack.Text知道Data对象的类型）。如果要排除TypeInfo，则反序列化缓存数据应使用JSON字符串填充Data属性。

ServiceStack Redis缓存未按预期进行序列化

1 个答案: