JsonConvert.SerializeObject在Windows XP SP3中崩溃

Question

我正在使用Newtonsoft json工具进行序列化和反序列化。以前我遇到了循环引用json错误，以解决我使用过的问题

JsonConvert.SerializeObject(NodeConfigurator.Instance, Formatting.None, new JsonSerializerSettings()
{
    ReferenceLoopHandling = ReferenceLoopHandling.Ignore
}); 

并且它在Windows 7及更高版本中运行良好，但是在Windows XP SP3中，它给出了“ Newtonsoft.Json.dll中发生了'System.NotSupportedException'类型的未处理异常 ”。 异常消息是“'CommandConverter'无法将'abc.RelayCommand'转换为'System.String'” 。 InnerException为null。

stacktrace消息是

at System.ComponentModel.TypeConverter.GetConvertToException(Object value, Type destinationType)
at System.Windows.Input.CommandConverter.ConvertTo(ITypeDescriptorContext context, CultureInfo culture, Object value, Type destinationType)
at System.ComponentModel.TypeConverter.ConvertToString(ITypeDescriptorContext context, CultureInfo culture, Object value)
at System.ComponentModel.TypeConverter.ConvertToInvariantString(Object value)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.TryConvertToString(Object value, Type type, String& s)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeString(JsonWriter writer, Object value, JsonStringContract contract)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer)
at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Type type, Formatting formatting, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Formatting formatting, JsonSerializerSettings settings)
at uOPCDA.ViewModel.ShellVM.SaveToXmlFile(Nullable`1 result) in 

我已经测试了简单的对象，并且在xp中也能正常工作。 但是，如果结构包含循环引用，则会给出上述异常。 帮我解决这个问题。

我的Json输出类似于Windows 7中的以下内容。

{
   "LastSavedPath":"C:\Program Files (x86)\abc\uOPC Server\Lastclosed.uopf",
   "Channels":[
      {
         "NewDeviceCommand":{

         },
         "DeleteChannelCommand":{

         },
         "ChannelDoubleClickCommand":{

         },
         "Device":[
            {
               "NewTagCommand":{

               },
               "DeleteDevice":{

               },
               "IsNewTagCommandVisible":true,
               "IsDeleteDeviceVisible":true,
               "IsNewDeviceCommandVisible":true,
               "Tags":[
                  {
                     "IsEnableApplyBtn":false,
                     "TagName":"Tag1",
                     "TagAddress":"102364",
                     "TagNameimg":null,
                     "TagRightImg":null,
                     "TagDescription":"New",
                     "DataType":"Bool",
                     "ClientAccess":"Read Only",
                     "ScanRate":0,
                     "NewTag":null,
                     "NewGrpTag":null,
                     "DeleteCurGrpTag":null,
                     "MultiTagGen":null,
                     "ScalingNone":true,
                     "ScalingLinear":false,
                     "ScalingSquareRoot":false,
                     "RVRHigh":0,
                     "RVRLow":0,
                     "SVRData":"Double",
                     "SVRHigh":0,
                     "SVRHighClamp":false,
                     "SVRLow":0,
                     "SVRLowClamp":true,
                     "SVRUnits":null,
                     "NegateScalVal":true,
                     "Location":"DiscreteInputs",
                     "Address":"02364",
                     "Length":1
                  },
                  {
                     "IsEnableApplyBtn":false,
                     "TagName":"Tag2",
                     "TagAddress":"102365",
                     "TagNameimg":null,
                     "TagRightImg":null,
                     "TagDescription":"dfdfdf",
                     "DataType":"Bool",
                     "ClientAccess":"Read Only",
                     "ScanRate":0,
                     "NewTag":null,
                     "NewGrpTag":null,
                     "DeleteCurGrpTag":null,
                     "MultiTagGen":null,
                     "ScalingNone":true,
                     "ScalingLinear":false,
                     "ScalingSquareRoot":false,
                     "RVRHigh":0,
                     "RVRLow":0,
                     "SVRData":"Double",
                     "SVRHigh":0,
                     "SVRHighClamp":false,
                     "SVRLow":0,
                     "SVRLowClamp":true,
                     "SVRUnits":null,
                     "NegateScalVal":true,
                     "Location":"DiscreteInputs",
                     "Address":"02365",
                     "Length":1
                  }
               ],
               "DeviceModel":"Modbus",
               "DeviceName":"Device1",
               "AsciiDeviceID":"5",
               "AsciiDeviceIDType":"Decimal",
               "EtherNetDeviceID":null,
               "ScanMode":"",
               "ConnectionTimeout":3,
               "ScanRate":0,
               "IsAddedFirstDevice":false,
               "RequestTimeout":1000,
               "FailAfterSuccTimeout":3,
               "InterReqDelay":0,
               "EnableAutoDeviceDemotion":false,
               "DemotAftSuccFailure":0,
               "DemotForMS":0,
               "DiscardWriteReq":true,
               "StartUp":"Do not generate on startup",
               "Action":"Do not overwrite, log error",
               "PortNumber":"502",
               "IPProtocol":"",
               "AddtoGroup":0,
               "AllowAutoGenSubGrp":true,
               "UseZeroBasAdd":true,
               "UseZeroBitAddReg":false,
               "UseHoldRegBitMask":false,
               "UseModFun06RegWrite":false,
               "SingleRegisterWrites":"0",
               "UseModFun05CoilWrite":false,
               "singleCoilWrites":"0",
               "ClientPrivilege":"Read/Write",
               "ModbusDeviceBaseAddress":"1",
               "DefaultModByteOrd":true,
               "FirstWrdLowin32BitDT":true,
               "firstWordLowIn32Bit":"1",
               "ByteOrder":"Big-endian",
               "FirstDWrdLowin64bitDT":false,
               "firstDwordLowIn64Bit":"0",
               "ModiconbitOrd":true,
               "LongasDblePrsUD":false,
               "CoilOutput":32,
               "CoilInput":32,
               "RegInternal":32,
               "RegHolding":32,
               "PerBlockRead":false,
               "CloseTCPSocTimeout":false,
               "VariableImport":null,
               "VariableImportBTN":null,
               "IncludeDescription":true,
               "DeactivateTagIllAddrExe":true,
               "RejectRepMsg":false,
               "UseModTCPFrame":true,
               "LeadingByte":0,
               "TrailingByte":0,
               "ImportFile":null,
               "ImportFileBTN":null,
               "SelectObjs":null,
               "FilterOptProp":false,
               "CreateTagasRWAllowed":false,
               "USeObjNameTagGrpName":false,
               "BitsperRegister":"16",
               "IsModBusTcpIpSelected":false,
               "IsScanModeTextBoxEnable":true,
               "IsRTUSelected":true,
               "IsSelected":true
            }
         ],
         "PageVisite":false,
         "ChannelName":"Channel1",
         "DeviceDriver":"Modbus ASCII Serial",
         "EnableDiagnostic":true,
         "VirtualNetwork":"None",
         "TransactionsPerCycle":0,
         "NetworkMode":"Load Balanced",
         "PhysicalMedium":"COM Port",
         "ReadProcessing":"Ignore",
         "ComID":"6",
         "BaudRate":"9600",
         "Databit":"7",
         "Parity":"Even",
         "Stopbit":"1",
         "FlowControl":"None",
         "NetworkAdapter":"Default",
         "ReportConnErr":true,
         "reportConnectionErrors":"1",
         "CloseConnWnIdle":true,
         "closeConnectionWhenIdle":"1",
         "SecofIdleTime":0,
         "WriteAllTags":false,
         "LatesValNonboolTags":false,
         "LatesvalAllTags":true,
         "DutyCycle":0,
         "NonNormalizedValue":"",
         "SingleSocket":true,
         "MoreSocket":false,
         "MaxSocketsperDevice":0,
         "PortNumber":"",
         "IPProtocol":"",
         "SerializePortsetting":true,
         "OperationCommunications":false,
         "EtherNetSettings":false,
         "IsTagListViewVisible":true,
         "IsChannelListViewVisible":true,
         "ChannelSelectedItem":null,
         "IsChannelSelected":false
      }
   ]
}

我的课如下

公共类Channel：BaseViewModel

 {

     RelayCommand _newDevice;

    public RelayCommand NewDeviceCommand
    {
        get
        {

            if (_newDevice == null)
                _newDevice = new RelayCommand(value => this.NewDevice(value as Channel));
            return _newDevice;
        }

    }
}

这是属性...

Answer 1

我认为您应该修改您的类，进行序列化并将[JsonIgnore]属性添加到导致循环引用的成员。

但是当对象反序列化时，您将需要重新分配该引用。

可以在官方文档中找到有关[JsonIgnore]更多信息： http : //www.newtonsoft.com/json/help/html/t_newtonsoft_json_jsonignoreattribute.htm