CODEWITHSUNDEEP
c#.netjson.netdeserializationnon-nullable
Lee
Lee

Reputation: 1641

I want Json.NET to fail deserializing a missing or undefined value type

In the code below, I want both DeserializeObject calls to throw an exception.

public class MyObj
{
    public int MyInt { get; set; }
}

static void Main(string[] args)
{
    var jsonString = "{ }";

    var obj = JsonConvert.DeserializeObject<MyObj>(jsonString); // Doesn't throw

    jsonString = "{ \"MyInt\": null }";

    obj = JsonConvert.DeserializeObject<MyObj>(jsonString); // Does throw
}

I would have expected there be a setting which does the reverse of JsonSerializerSettings.MissingMemberHandling, but I've not been able to find it.

For context, I'm using Json.NET as the request deserializer for an Azure Function API.

Upvotes: 2

Views: 179

Answers (1)

Renat
Renat

Reputation: 8962

You may use JsonProperty attribute with Required = Required.Always :

public class MyObj
{
    [JsonProperty(Required = Required.Always)]
    public int MyInt { get; set; }
}

From Required enum doc:

Always ... The property must be defined in JSON and cannot be a null value.

Upvotes: 3

Related Questions