Why doesn't WCF work the same as ASMX?

Not sure what I am doing wrong, but I have two services, WCF and the other is an ASMX service.

I am trying to call an array of twos in the same way as in my version of asmx.

Here is a picture of two services:

I have a problem with being able to call this method, but I would like to know why ArrayOfDouble

it is not displayed in the same way in my serviceref2 as my serviceref1?

This is the WCF version:

namespace WcfSum
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface SumListWCF
    {

        [OperationContract]
        string CalculateSum(List<double> listDouble);
    }
}

namespace WcfSum
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    public class SumList : SumListWCF
    {
        public string CalculateSum(List<double> listDouble)
        {
            return listDouble.Sum().ToString();
        }
    }
}

      

        
        
        
      

    

This is the ASMX version:

namespace CalculateWebServiceSum
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class SumList : System.Web.Services.WebService
    {
        [WebMethod]
        public string CalculateSum(List<double> listDouble)
        {
            return listDouble.Sum().ToString();

             //return listDouble.Select(n => (double)n).ToString();
        }
    }
}

      

        
        
        
      

    

Previous post was here: WCF array of doubles was not invoked successfully

This provided a fix, but doesn't explain why it doesn't work the same way. Or if there is a way to make him act the same way. What makes me feel like they are basically missing something?

EDIT

Ps, they just run locally.