I am using Newtonsoft JSON to deserialize an object that contains interfaces. Newtonsoft was having trouble "figuring out" how to map the interfaces to their concrete types on deserialization, so I was following the directions in this answer to fix the issue.
I am doing the following to deserialize:
var converter = new JsonSerializer();
converter.Converters.Add(new DeviceCalibrationConverter());
// Obviously parameter.value and typeObj being the JSON and Type respectively
// I can see stepping through this that these are, in fact, the correct values
object deserialized = converter.Deserialize(new StringReader(parameter.Value), typeObj);
I'm using the DeviceCalibrationConverter object to try to map my interface to its concrete type:
public class DeviceCalibrationConverter : JsonConverter
{
public override bool CanConvert(Type objectType)
{
// I am trying to map the IDeviceCalibration interface to its concrete type (DeviceCalibration)
return objectType.Equals(typeof(IDeviceCalibration));
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
return serializer.Deserialize(reader, typeof(DeviceCalibration));
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
serializer.Serialize(writer, value);
}
}
I'm currently getting an "ArgumentOutOfRangeException." Full exception details are below:
System.ArgumentOutOfRangeException was unhandled
HResult=-2146233086
Message=Version's parameters must be greater than or equal to zero.
Parameter name: build
Source=mscorlib
ParamName=build
StackTrace:
at System.Version..ctor(Int32 major, Int32 minor, Int32 build, Int32 revision)
at Void .ctor(Int32, Int32, Int32, Int32)(Object[] )
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObjectUsingCreatorWithParameters(JsonReader reader, JsonObjectContract contract, JsonProperty containerProperty, ObjectConstructor`1 creator, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewObject(JsonReader reader, JsonObjectContract objectContract, JsonProperty containerMember, JsonProperty containerProperty, String id, Boolean& createdFromNonDefaultCreator)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonSerializer.Deserialize(TextReader reader, Type objectType)
at FunctionalTesting.ExecuteXMLScript.Execute() in [folder]\ExecuteXMLScript.cs:line 141
at FunctionalTesting.TestRunner.RunTests() in [folder]\TestRunner.cs:line 102
at FunctionalTesting.Program.Main(String[] args) in [folder]\Program.cs:line 43
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
This occurs, by the way, on the line where I try to call Deserialize.
Edit: The entire JSON is pretty lengthy but it turns out that the offending line is as follows:
{"State":"needs-translation","OriginalString":"LP","StringID":[id],"StringValue":"LP"}}],
"MarketingFeatures":null,
"CDIDriver" {"Name":"[Product Name]",
"Version":{"Major":1,"Minor":0,"Build":-1,"Revision":-1,"MajorRevision":-1,"MinorRevision":-1}}
In particular, in "Version" deserializes to:
{"Major":1,"Minor":0,"Build":-1,"Revision":-1,"MajorRevision":-1,"MinorRevision":-1}
This deserializes to the System.Version class and this is invalid, thus producing the exception I listed above.
CDIDriver, by the way, creates the Version object as follows:
Version = new Version((int)major, (int)minor);
This is perfectly valid, and the document does, in fact, say that using this constructor as described will set the build and revision to -1 (as shown in the JSON). My question, then, is if this is a perfectly valid, document state of the object, why does it produce this exception when I try to deserialize it?
I am aware that trying to do something like new Version(1, 0, -1, -1)
will produce an exception and that this is the documented behavior. (This seems like very odd behavior given that that would result in a valid object state, but that's just my opinion). Is there some way around having to do:
new Version(1, 0, 0, 0)
just for the sake of making the deserialization work?