Json.net fails when trying to deserialize a class that inherits from Exception

问题

I have a class SearchError that inherits from Exception, and when ever I try to deserialize it from a valid json I get the following exception:

ISerializable type 'SearchError' does not have a valid constructor. To correctly implement ISerializable a constructor that takes SerializationInfo and StreamingContext parameters should be present. Path '', line 1, position 81.

I tried implementing the suggested missing constructor, and it didn't help.

This is the class after implementing the suggested constructor:

public class APIError : Exception
{
    [JsonProperty("error")]
    public string Error { get; set; }

    [JsonProperty("@http_status_code")]
    public int HttpStatusCode { get; set; }

    [JsonProperty("warnings")]
    public List<string> Warnings { get; set; }

    public APIError(string error, int httpStatusCode, List<string> warnings) : base(error)
    {
        this.Error = error;
        this.HttpStatusCode = httpStatusCode;
        this.Warnings = warnings;
    }

    public APIError(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)
        : base(info, context)
    {
        Error = (string)info.GetValue("error", typeof(string));
        HttpStatusCode = (int)info.GetValue("@http_status_code", typeof(int));
        Warnings = (List<string>)info.GetValue("warnings", typeof(List<string>));
    }
}

Now I'm getting the following exception (also in json.net code):

Member 'ClassName' was not found.

I also tried implementing the same solution as in this related question, also got the same error above.

回答1:

This question has been answered here: https://stackoverflow.com/a/3423037/504836

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);
    }
}

回答2:

As the error says, you are missing the serialization constructor:

public class SearchError : Exception
{
    public SearchError(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) : base(info, context)
    {

    }
}

来源：https://stackoverflow.com/questions/14186000/json-net-fails-when-trying-to-deserialize-a-class-that-inherits-from-exception

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