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在JSON字符串反序列化期間處理名稱空間更改

[英]handling name space changes during deserialization of JSON String

 原文  2015-01-24 09:44:33  7   1    c#/ json/ redis/ json.net/ deserialization

問題描述

我有2個應用程序在redis Server的幫助下相互通信，在我的第一個應用程序中，我可以序列化和反序列化，並且可以使用以下類型的對象 

   {
 "$type": "System.Collections.Generic.Dictionary`2[[System.Int32, mscorlib],   [OPCMessagingService.Resource, OPCMessagingService]], mscorlib",
 "71": {
"$type": "OPCMessagingService.Resource, OPCMessagingService",
"SiteID": 2,
"ResourceID": 71,
"ProcessOrder": "001000380873",
"CurrentStatus": 0,
"CycleTime": 55,
"DeviceList": [
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 71,
    "DeviceIp": "10.142.117.7",
    "ComPort": "COM14"
  },
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 71,
    "DeviceIp": "10.142.117.3",
    "ComPort": "COM10",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "DISPOMELT 5245 BULK - 0020 -投礦物油，樹脂，液體樹脂和橡膠",
    "_delayedMessageText": "",
    "_counter": 0
  }
],
"UpdateDate": 20150120,
"UpdateTime": 231506,
"CurrentDate": 20150124,
"CurrentTime": 151513,
"CurrentMessage": "DISPOMELT 5245 BULK - 0020 -投礦物油，樹脂，液體樹脂和橡膠"
  },
  "72": {
"$type": "OPCMessagingService.Resource, OPCMessagingService",
"SiteID": 2,
"ResourceID": 72,
"ProcessOrder": "001000380874",
"CurrentStatus": 0,
"CycleTime": 60,
"DeviceList": [
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 72,
    "DeviceIp": "10.142.117.98",
    "ComPort": "COM100",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "DISPOMELT 5245 BULK - 0050 -熔樹脂",
    "_delayedMessageText": "",
    "_counter": 0
  },
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 72,
    "DeviceIp": "10.142.117.4",
    "ComPort": "COM11",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "DISPOMELT 5245 BULK - 0050 -熔樹脂",
    "_delayedMessageText": "",
    "_counter": 0
  },
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 72,
    "DeviceIp": "10.142.117.8",
    "ComPort": "COM15"
  },
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 72,
    "DeviceIp": "10.142.117.97",
    "ComPort": "COM101"
  }
],
"UpdateDate": 20150120,
"UpdateTime": 231534,
"CurrentDate": 20150124,
"CurrentTime": 151513,
"CurrentMessage": "DISPOMELT 5245 BULK - 0050 -熔樹脂"
  },
  "73": {
"$type": "OPCMessagingService.Resource, OPCMessagingService",
"SiteID": 2,
"ResourceID": 73,
"ProcessOrder": "001000375454",
"CurrentStatus": 0,
"CycleTime": 60,
"DeviceList": [
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 73,
    "DeviceIp": "10.142.117.5",
    "ComPort": "COM12",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "XHC 9228 BULK - 0050 -熔樹脂",
    "_delayedMessageText": "",
    "_counter": 0
  },
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 73,
    "DeviceIp": "10.142.117.9",
    "ComPort": "COM16"
  }
],
"UpdateDate": 20150120,
"UpdateTime": 223043,
"CurrentDate": 20150124,
"CurrentTime": 151513,
"CurrentMessage": "XHC 9228 BULK - 0050 -熔樹脂"
  },
  "74": {
"$type": "OPCMessagingService.Resource, OPCMessagingService",
"SiteID": 2,
"ResourceID": 74,
"ProcessOrder": "001000375455",
"CurrentStatus": 0,
"CycleTime": 40,
"DeviceList": [
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 74,
    "DeviceIp": "10.142.117.2",
    "ComPort": "COM9",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "XHC 9228 BULK - 0040 -投樹脂和剩料:",
    "_delayedMessageText": "",
    "_counter": 0
  },
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 74,
    "DeviceIp": "10.142.117.1",
    "ComPort": "COM5"
  }
],
"UpdateDate": 20150120,
"UpdateTime": 224143,
"CurrentDate": 20150124,
"CurrentTime": 151513,
"CurrentMessage": "XHC 9228 BULK - 0040 -投樹脂和剩料:"
  },
  "75": {
"$type": "OPCMessagingService.Resource, OPCMessagingService",
"SiteID": 2,
"ResourceID": 75,
"ProcessOrder": "001000375456",
"CurrentStatus": 0,
"CycleTime": 50,
"DeviceList": [
  {
    "$type": "OPCMessagingService.StackLight, OPCMessagingService",
    "ResourceId": 75,
    "DeviceIp": "10.142.117.10",
    "ComPort": "COM17"
  },
  {
    "$type": "OPCMessagingService.LED, OPCMessagingService",
    "ResourceId": 75,
    "DeviceIp": "10.142.117.6",
    "ComPort": "COM13",
    "IsMessageDelivered": false,
    "RetryCount": 3,
    "IsRetryRequired": true,
    "_messageHeader": ":*HF601011471",
    "_messageText": "XHC 9228 BULK - 0020 -投礦物油和橡膠、抗氧劑,升溫",
    "_delayedMessageText": "",
    "_counter": 0
  }
],
"UpdateDate": 20150120,
"UpdateTime": 225331,
"CurrentDate": 20150124,
"CurrentTime": 151513,
"CurrentMessage": "XHC 9228 BULK - 0020 -投礦物油和橡膠、抗氧劑,升溫"
 }
 }

我可以序列化並在一個應用程序中取消序列化，但是當我嘗試在另一個顯然具有不同名稱空間的應用程序中將其取消序列化時。 我得到一個例外

JSON'System.Collections.Generic.Dictionary`2 [[System.Int32，mscorlib]，[OPCMessagingService.Resource，OPCMessagingService]]，mscorlib'中指定的錯誤解決類型。 路徑“ $ type”，第1行，位置138。

我試圖在另一個應用程序中反序列化Json String時嘗試執行以下操作，但我不能做什么反序列化此對象呢？ 

 public static T GetRedisKeyValue<T>(string key)
    {
        if (key.Trim().Length > 0)
        {
            GetSentinelMaster();
            using (ConnectionMultiplexer redisClient = ConnectionMultiplexer.Connect(GetRedisConfiguraion()))
            {
                IDatabase redisDB = redisClient.GetDatabase(); // Getting database connection
                string temp = redisDB.StringGet(key);
                Type type = typeof(T);
                JObject jsonObject = JObject.Parse(temp);
                jsonObject["$type"] = type.FullName + ", " + type.Assembly.FullName;
               // JsonConvert.DeserializeObject<T>(temp);
                return JsonConvert.DeserializeObject<T>(temp, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Objects, TypeNameAssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Full });
            }
        }
        return default(T);
    }

我還能做些什么來實現這一目標？

1 個解決方案

解決方案1
 2  2015-01-24 11:39:21

"$type"的格式已正式進行硬編碼，以包括發送系統的CLR名稱空間。 因此，您可以：

  1. 重命名CLR名稱空間以匹配發送系統的名稱空間，或者

  2. 子類化DefaultSerializationBinder並在反序列化期間通過在JsonSerializerSettings.Binder進行設置，使用它來重命名CLR名稱空間名稱。

以下是執行此操作的第一步： 

public class NamespaceMappingSerializationBinder : DefaultSerializationBinder
{
    public string FromNamespace { get; set; }

    public string ToNamespace { get; set; }

    public override Type BindToType(string assemblyName, string typeName)
    {
        string fixedTypeName;
        if (FromNamespace != null && ToNamespace != null)
        {
            fixedTypeName = typeName.Replace(FromNamespace, ToNamespace);
        }
        else
        {
            fixedTypeName = typeName;
        }
        var type = base.BindToType(assemblyName, fixedTypeName);
        return type;
    }
}

然后，當您反序列化JSON時，請在JsonSerializerSettings設置Binder ， JsonSerializerSettings所示： 

JsonSerializerSettings settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Objects, Binder = new NamespaceMappingSerializationBinder { FromNamespace = "From Namespace", ToNamespace = "Your Namespace" } };

上面的類型名稱解析非常粗糙。 我在這里找到了一個更聰明的解析器： 如何解析C＃泛型類型名稱？ 。 您可能還需要擴展自定義的Binder以具有映射字典。

同樣，如果需要在序列化時重新映射名稱空間名稱，並且在.Net 4.0或更高版本中工作，則可以覆蓋BindToName 。

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