我正在使用Newtonsoft json工具进行序列化和反序列化。之前我得到了循环引用json错误，以解决我使用的问题
JsonConvert.SerializeObject(NodeConfigurator.Instance, Formatting.None, new JsonSerializerSettings()
{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
});
它在windows 7及更高版本中运行良好，但在windows xp sp3中，它给出了"Newtonsoft.Json.dll中发生类型为System.NotSupportedException的未处理异常"。异常消息为"'CommonConverter'无法将'abc.RelayCommand'转换为'System.String'"。InnerException为null。
堆栈跟踪消息是
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
我已经用简单的对象进行了测试，它在xp中也很好地工作。但是，如果该结构包含循环引用，则给出上述异常。帮我解决这个问题。
在Windows7中，我的Json输出如下所示。
{
"LastSavedPath":"C:Program Files (x86)abcuOPC ServerLastclosed.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
}
]
}
我的课低于
公共类通道：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。。。
我认为您应该修改您的类，即序列化并向导致循环引用的成员添加[JsonIgnore]属性。
但当对象被反序列化时，您将需要将这个引用分配回。
有关[JsonIgnore]的更多信息，请参阅官方文档：http://www.newtonsoft.com/json/help/html/t_newtonsoft_json_jsonignoreattribute.htm