JsonConvert.SerializeObject在Windows XP SP3中崩溃

Question

I am using Newtonsoft json tool to serialize and de serialize.Previously i got circular reference json error, to resolve that i have used

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

and it is working good in windows 7 and above , but in windows xp sp3 it is giving " An unhandled exception of type 'System.NotSupportedException' occurred in Newtonsoft.Json.dll ". The exception message is "'CommandConverter' is unable to convert 'abc.RelayCommand' to 'System.String'" . The InnerException is null.

The stacktrace message is

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 

I have tested with simple object and it is working good in xp also. But if the structure contains cyclic reference it is giving the above exception. Help me to solve this problem.

My Json output is like below in Windows 7.

{
   "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
      }
   ]
}

My class is like below

public class Channel : BaseViewModel

 {

     RelayCommand _newDevice;

    public RelayCommand NewDeviceCommand
    {
        get
        {

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

    }
}

Here is properties...

Answer 1

I think you should amend your class, that you serializing and add [JsonIgnore] attribute to a member that leads to cyclic reference.

But you will need to assign this reference back when object is deserialized.

More info on [JsonIgnore] can be found in the official documentation: http://www.newtonsoft.com/json/help/html/t_newtonsoft_json_jsonignoreattribute.htm