System.OverflowException序列化

Question

我有一些類爲解析網絡響應：

[DataContract] 
public abstract class GYResponse 
{ 
    [DataMember(Name = "code")] 
    public int Code { get; set; } 
    [DataMember(Name = "message")] 
    public string Message { get; set; } 
} 

[DataContract] 
public class ResponseGetUser : GYResponse 
{ 
    [DataMember(Name = "result")] 
    public GYUser Result { get; set; } 
} 

[DataContract] 
public class ResponseGetVenue : GYResponse 
{ 
    [DataMember(Name = "result")] 
    public GYVenue Result { get; set; } 
} 

我用DataContractJsonSerializer：

GYResponse response_obj = request.Creater.CreateResponseObj(); 
//CreateResponseObj() return ResponseGetUser, ResponseGetVenue etc 

using (MemoryStream stream = new MemoryStream(Encoding.Unicode.GetBytes(gyResponse))) 
{ 
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(response_obj.GetType());     
    response_obj = (GYResponse)serializer.ReadObject(stream);  
} 

我"System.OverflowException"在行：

response_obj = (GYResponse)serializer.ReadObject(stream); 

/checked編譯器選項關閉。而ReadObject不能拋出這個異常。

但是，如果我重寫的類，然後它的工作原理：

[DataContract] 
public abstract class GYResponse 
{ 

} 

[DataContract] 
public class ResponseGetUser : GYResponse 
{ 
    [DataMember(Name = "result")] 
    public GYUser Result { get; set; } 
    [DataMember(Name = "code")] 
    public int Code { get; set; } 
    [DataMember(Name = "message")] 
    public string Message { get; set; } 
} 

[DataContract] 
public class ResponseGetVenue : GYResponse 
{ 
    [DataMember(Name = "result")] 
    public GYVenue Result { get; set; } 
    [DataMember(Name = "code")] 
    public int Code { get; set; } 
    [DataMember(Name = "message")] 
    public string Message { get; set; } 
} 

我明白，這是一個模糊的問題，但無法理解可能是什麼問題。什麼時候可以拋出這個異常？

更新異常信息：

消息：

There was an error deserializing the object of type GotYou.RequesterService.ResponseGetInfo. Value was either too large or too small for an Int32. 

的InnerException：

at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) 
    at System.String.System.IConvertible.ToInt32(IFormatProvider provider) 
    at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ConvertObjectToPrimitiveDataContract(DataContract contract, Object value, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ConvertObjectToDataContract(DataContract contract, Object value, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ReadClassDataContractMembers(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, Object newInstance, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ReadClassDataContractMembers(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, Object newInstance, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ConvertDictionaryToClassDataContract(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ConvertObjectToDataContract(DataContract contract, Object value, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ReadClassDataContractMembers(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, Object newInstance, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ConvertDictionaryToClassDataContract(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ConvertObjectToDataContract(DataContract contract, Object value, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ReadClassDataContractMembers(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, Object newInstance, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.ObjectToDataContractConverter.ConvertDictionaryToClassDataContract(DataContractJsonSerializer serializer, ClassDataContract dataContract, Dictionary`2 deserialzedValue, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ConvertObjectToDataContract(DataContract contract, Object value, XmlObjectSerializerReadContextComplexJson context) 
    at System.Runtime.Serialization.Json.DataContractJsonSerializer.ReadObject(Stream stream) 

StrackTrace：

at System.Runtime.Serialization.Json.DataContractJsonSerializer.ReadObject(Stream stream) 
    at GotYou.RequesterService.PostRequester.getResponseCallback(IAsyncResult asynchronousResult) 

JSON響應：

{ 
    "code": 0, 
    "message": "", 
    "result": { 
     "uid": "51da997decaa3ca351000000", 
     "url": "", 
     "nickname": "Smileman", 
     "avatar": "\/img\/profile_pics\/users\/51da997decaa3ca351000000\/cache\/avatar48x48.jpg?lastUpdate=1381215566", 
     "age": { 
      "number": "22", 
      "suffix": "года", 
      "birthday": "1991-04-17" 
     }, 
     "sex": 1, 
     "aboutself": "", 
     "premium": true, 
     "isFriend": 3, 
     "online": { 
      "lastVisit": "7 минут назад", 
      "status": true 
     }, 
     "features": { 
      "car": false, 
      "house": false, 
      "cash": false, 
      "group": true 
     }, 
     "location": { 
      "longitude": 36.570838832, 
      "latitude": 50.571069472, 
      "timestamp": 1381319677 
     }, 
     "bonuses": 8515, 
     "address": "", 
     "city": { 
      "code": "3100000100000", 
      "title": "" 
     }, 
     "cover": "\/img\/profile_pics\/users\/51da997decaa3ca351000000\/cache\/hero480x290.jpg?lastUpdate=1381215566", 
     "distance": 63.671441859659, 
     "paidServices": { 
      "vip": true, 
      "theming": true, 
      "invisible": false, 
      "incognito": false, 
      "closed": true 
     }, 
     "regdate": "19.08.2013", 
     "purpose": { 
      "id": "500fa718ecaa3c6e3b000002", 
      "title": "" 
     } 
    } 
} 

Answer 1

這個數字：3100000100000在您的數據太大，Int32持有它。 Int32的最大正值爲2147483647。你可能會考慮使用Int64（也會太小，因爲它的範圍在4294967295結束）。

然而，code領域通常被解釋爲字符串，所以也許string數據類型是一個更好的選擇，例如：

[DataMember(Name = "code")] 
public string Code { get; set; }