Input string in not a valid number - JSON deserialization

Question

I have this array:

{
    "AssemblyVersion":"0.1.333.5973",
    "Exception":
    {
        // [...]
    }
}

which is serialized from this class:

public class ErrorData
{
    public string AssemblyVersion { get; private set; }
    public Exception Exception { get; private set; }

    public ErrorData(string assemblyVersion, Exception ex)
    {
        AssemblyVersion = assemblyVersion;
        Exception = ex;
    }

    public override string ToString()
    {
        return JsonConvert.SerializeObject(this);
    }
}

Serializing it back to an object produces the following exception:

Newtonsoft.Json.JsonReaderException: Input string '0.1.335.5973' is not a valid number. Path 'AssemblyVersion', line 1, position 29.
    at Newtonsoft.Json.JsonTextReader.ParseNumber(ReadType readType)
    at Newtonsoft.Json.JsonTextReader.ReadStringValue(ReadType readType)
    at Newtonsoft.Json.JsonTextReader.ReadAsString()
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter)
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ResolvePropertyAndCreatorValues(JsonObjectContract contract, JsonProperty containerProperty, JsonReader reader, Type objectType)
    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.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
    at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
    at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
    at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
    at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value)

In a nutshell I'm serializing an ErrorData instance as a json string with the overridden ToString() method, passing the result as a command line argument to a child process which is deserializing it back to an ErrorData instance.

What am I missing? It seems like the AssemblyVersion string is seen as a number instead of a string.

Edit:

I'm deserializing it this way:

ErrorData errorData = JsonConvert.DeserializeObject<ErrorData>(args[0]);

Serializing is already shown in the code above, I implemented it into ToString() method.

I can verify that it happens because I'm passing the array as a command line arg. This code here works:

ErrorData errorData = Json.DeserializeObject<ErrorData>(new ErrorData("", new Exception()).ToString());

Can you show the code you're using for the serialization and deserialization? — Doug Wilson
– Doug Wilson, Commented May 8, 2016 at 17:49
What is the full ToString() output of the exception including the exception type, message, traceback inside Json.NET and InnerException, if any? — dbc
– dbc, Commented May 8, 2016 at 17:55
I think this problem just occurs because I'm passing this JSON array as a command line parameter to a child process — Christian Klemm
– Christian Klemm, Commented May 8, 2016 at 19:15
That's probably it then. You didn't escape the \" character around the 0.1.335.5973 so Command Prompt ate it somehow, leading Json.NET to try to parse it as a numeric token. See superuser.com/questions/206436/…. — dbc
– dbc, Commented May 8, 2016 at 19:43
I think I will write the data as a file into temp folder and just pass the path to the file to the child process. Should be the easiest way — Christian Klemm
– Christian Klemm, Commented May 8, 2016 at 19:46

tekado · Accepted Answer · 2016-08-03 10:07:33Z

-1

I suggest that you should check your input, because following code will throw exception about invalid number:

JsonConvert.DeserializeObject<ErrorData>("{'AssemblyVersion':0.1.333.5973,'Exception':{}}");

But if you quote AssemblyVersion value, then deserialization will succeed:

JsonConvert.DeserializeObject<ErrorData>("{'AssemblyVersion':'0.1.333.5973','Exception':{}}");

answered Aug 3, 2016 at 10:07

tekado

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