Handle undefined values while deserializing object using JsonConvert in c#

Question

I have a Json serialized configuration in which I need to deserialize the object using

JsonConvert.DeserializeObject<>(jsonConfig)

to Myclass list. In jsonConfig there may be some properties missing where I got an exception like below.

Required property 'xxx' not found in JSON. Path '[0].yyy',

So is there any way to handle the undefined values while deserializing an object in c#?

Json.Net will only throw this exception if you have properties in your model which are marked as required, e.g. [JsonProperty(Required = Required.Always)]. So the obvious solution is to remove the requirement. — Brian Rogers
– Brian Rogers, Commented Sep 20, 2019 at 21:52

Rahul Nikate · Accepted Answer · 2019-09-19 09:26:35Z

1

You need to make those properties nullable in object model class like below.

 [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
 public int? someProperty { get; set; }

Also if property itself is missing from class while deserializing then you can do like below:

 JsonSerializerSettings settings = new JsonSerializerSettings();
 settings.MissingMemberHandling = MissingMemberHandling.Ignore;

 var deserializedObj = JsonConvert.DeserializeObject<MyModelClass>(jsonConfig, settings);

edited Sep 19, 2019 at 9:26

answered Sep 19, 2019 at 7:49

Rahul Nikate

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3 Comments

Yuvaranjani Over a year ago

Thanks Rahul. this NullValueHandling is only for the property which has null value right. if the property itself missing means is there any way to handle or do we need any Custom JsonConverter for handling the undefined values?

Yuvaranjani Over a year ago

it doesn't work for me still it's throwing the same exception

Rahul Nikate Over a year ago

Please update your question and add your model class.

awais · Accepted Answer · 2019-09-19 07:45:35Z

-1

undefined is not a valid json value, even though it is valid in javascript. Please check https://api.jquery.com/jQuery.parseJSON/

For json, use null instead of undefined: { "something": null }

answered Sep 19, 2019 at 7:45

awais

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1 Comment

ChrisW Over a year ago

A property is undefined in JSON if the property (including the property name) doesn't exist in the tree.

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