Error while converting to object using Json.Net

Question

I am receiving the following Json string as output from a REST service:

"CategoryDtls":       
             {
            "category": "S",
            "msgType": "0",
            "sourceId": "21999"
           }

I wish to convert it to a C# object using Json.net

public partial class CategoryDtls
    {
        private TestChar categoryField;
        public TestChar category
        {
            get
            {
                return categoryField;
            }

            set
            {
                if (value == null)
                {
                    categoryField = null;
                }

                var stringValue = Convert.ToString(value);
                var charClass = new TestChar();
                charClass.SimpleChar = stringValue;
                categoryField = charClass;

            }
        }
        public string msgType { get; set; }
        public string sourceId { get; set; }
    }

public partial class TestChar : object, System.ComponentModel.INotifyPropertyChanged
    {

        private string simpleCharField;

        public string SimpleChar
        {
            get
            {
                return this.simpleCharField;
            }
            set
            {
                this.simpleCharField = value;
                this.RaisePropertyChanged("SimpleChar");
            }
        }

        public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

        protected void RaisePropertyChanged(string propertyName)
        {
            System.ComponentModel.PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
            if ((propertyChanged != null))
            {
                propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
            }
        }
    }

When doing so, I get an error like

{"Could not cast or convert from System.String to JsonParser.TestChar."}

I tried to customize the set method for Category property like above but couldn't resolve it. I can't change the Json string. Is there anyway, I can resolve this issue.

Arthur Rey · Accepted Answer · 2015-09-18 08:58:54Z

1

You could create a custom CategoryConverter and use it by declaring it [JsonConverter(typeof(CategoryConverter))] above your public TestChar category.

public class CategoryConverter : JsonConverter
{
    // Declared as abstract in JsonConverter so must be overridden
    public override bool CanConvert(Type objectType) { return true; }

    // Declared as abstract in JsonConverter so must be overridden
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        return JToken.Load(reader).ToObject<TestChar>();
    }
}

answered Sep 18, 2015 at 8:58

Arthur Rey

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