How to serialize object type in WCF?

Question

I have this Dto model class:

[System.Runtime.Serialization.DataContract, System.Serializable]
public class DataObj
{
    [System.Runtime.Serialization.DataMember]
    public object Value { get; set; }

    public static DataObj CreateDataObj(object obj)
    {
        return new DataObj { Value = obj };
    }
}

static void main()
{
      var obj1 = DataObj.CreateDataObj(10);
      wcfService.Send(obj1);
      var obj2 = DataObj.CreateDataObj("hello");
      wcfService.Send(obj2);
      var obj3 = DataObj.CreateDataObj(new int[]{10, 20,30});
      wcfService.Send(obj3);
      var obj4 = DataObj.CreateDataObj(new string[]{"ht", "fd","xs"});
      wcfService.Send(obj4);
 }

In the main method, WCF calls for obj 1 and 2 are ok but for obj 3 and 4 aren't ok and throw serialization exception.

How can I transfer obj 3 and 4 in service calls?

Answer 1

In WCF communication, we must explicitly specify the type of serialization. This ensures that both the client and server recognize the custom type during communication. Marking data members as objects violates WCF design pattern. Based on your scenario, the Datatable type can be used, but this is deprecated.
https://www.c-sharpcorner.com/UploadFile/deepak.sharma00/how-to-return-a-datatable-from-wcf-service/
It is recommended that you specify the type of data that needs to be serialized when designing a data contract. For example, we can consider using List[T].
Feel free to let me know if there is anything I can help with.