How to deserialize object derived from Exception class using Json.net?

Question

I'm trying to deserialize object derived from Exception class:

[Serializable]
public class Error : Exception, ISerializable
{
    public string ErrorMessage { get; set; }
    public Error() { }
}

Error error = JsonConvert.DeserializeObject< Error >("json error obj string");

It gives me error:

ISerializable type 'type' does not have a valid constructor.

Firstly, that's not the best way to extend the Exception class. — thelost
– thelost, Commented Aug 6, 2010 at 10:02
I'm surprised this even compiles since you haven't actually implemented the ISerializable interface. — Ronald Wildenberg
– Ronald Wildenberg, Commented Aug 6, 2010 at 10:12

Uwe Keim · Accepted Answer · 2020-06-06 12:19:22Z

20

Adding a new constructor

public Error(SerializationInfo info, StreamingContext context){}

solved my problem.

Here complete code:

[Serializable]
public class Error : Exception
{
    public string ErrorMessage { get; set; }

    public Error(SerializationInfo info, StreamingContext context) 
    {
        if (info != null)
            this.ErrorMessage = info.GetString("ErrorMessage");
    }

    public override void GetObjectData(SerializationInfo info,StreamingContext context)
    {
        base.GetObjectData(info, context);

        if (info != null)
            info.AddValue("ErrorMessage", this.ErrorMessage);
    }
}

edited Jun 6, 2020 at 12:19

Uwe Keim

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answered Aug 6, 2010 at 10:47

Piotr

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1 Comment

Alex Zhukovskiy Over a year ago

You shouldn't check info on null, it's guarantee to be not-null :)

Martijn · Accepted Answer · 2014-08-07 13:30:47Z

7

Alternatively, you can choose the OptIn strategy and define the properties that should be processed. In case of your example:

[JsonObject(MemberSerialization.OptIn)]
public class Error : Exception, ISerializable
{
    [JsonProperty(PropertyName = "error")]
    public string ErrorMessage { get; set; }

    [JsonConstructor]
    public Error() { }
}

(Credits go to this library)

answered Aug 7, 2014 at 13:30

Martijn

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Comments

Uwe Keim · Accepted Answer · 2020-06-10 05:35:47Z

2

Adding upon already provided nice answers;

If the exception is coming from a java based application, then above codes will fail.

For this, sth. like below may be done in the constructor;

public Error(SerializationInfo info, StreamingContext context)
{
    if (info != null)
    {
        try
        {
            this.ErrorMessage = info.GetString("ErrorMessage");
        }
        catch (Exception e) 
        {
            **this.ErrorMessage = info.GetString("message");**
        }
    }
}

edited Jun 10, 2020 at 5:35

Uwe Keim

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answered Jun 28, 2017 at 14:44

myuce

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