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c#jsonerror-handling
Green_qaue
Green_qaue

Reputation: 3661

Handle error caused from deserializing a null value

I have a Json file that can contain booleans with a null value. If I try to Deserialize these boolean I get a InvalidCastException because booleans are not nullable.

The line triggering the exception:

var result = serializer.Deserialize(jObject.GetValue(propertyName).CreateReader(), type);

How can I handle this so that I do not get an exception? catch the error and add it to a List, then continue the method. Instead of the application breaking, like it is now.

Upvotes: 1

Views: 2046

Answers (2)

Jamez Fatout
Jamez Fatout

Reputation: 392

Create a new JsonSerializerSettings instance..

var settings = new JsonSerializerSettings
                    {
                        NullValueHandling = NullValueHandling.Ignore
                    };
var jsonModel = JsonConvert.DeserializeObject<Customer>(jsonString, settings);

Upvotes: 4

user1672994
user1672994

Reputation: 10849

You can define the JsonSerializerSettings to handle the error. So that program does not throw exception. However in this case, the property will be set to default value if unable to convert/cast.

var settings = new JsonSerializerSettings
                    {
                        Error = (sender, args) => { args.ErrorContext.Handled = true; }
                    };
var jsonModel = JsonConvert.DeserializeObject<Customer>(jsonString, settings);

You can read about this at this Newtonsoft doc link.

Upvotes: 0

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