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c#.netjsonjson.net
Hristo Kolev
Hristo Kolev

Reputation: 1574

How to catch if JSON property does not exists when deserializing with Newtonsoft.Json?

I'm using MissingMemberHandling = MissingMemberHandling.Error, in order to throw an error when there is a property in the JSON and no corresponding property in my C# class.

That works.

In addition to that, I want it to throw an error when there is a property in my class but not in the JSON.

How can I do that?

Upvotes: 0

Views: 2628

Answers (1)

Anu Viswan
Anu Viswan

Reputation: 18155

You could make use of JsonObjectAttribute with ItemRequired set to Required.Always.. 

[JsonObject(ItemRequired = Required.Always)]

For example,Assuming User Class is defined as

[JsonObject(ItemRequired = Required.Always)]
public class User
{
    public string Name{get;set;}
    public int Age{get;set;}
}

If you attempt to deserialize a Json without the Age Property, for example

var json = @"{
'Name':'John Doe',
}";

var result = JsonConvert.DeserializeObject<User>(json);

You would recieve an JsonSerializationException

Required property 'Age' not found in JSON. Path ''

Upvotes: 2

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