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

user_736145 0
Viewed 105

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.

deserialization non-nullable json.net .net c#
1 Answers

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.

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