I'm trying to pass an array as an argument to my WCF service. To test this using Damian's sample code, I modified GetData it to try to pass an array of ints instead of a single int as an argument:

using System;
using System.ServiceModel;

namespace WcfService1
{
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        string GetData(int[] value);

        [OperationContract]
        object[] GetSomeObjects();
    }
}

using System;
namespace WcfService1
{
    public class Service1 : IService1
    {
        public string GetData(int[] value)
        {
            return string.Format("You entered: {0}", value[0]);
        }

        public object[] GetSomeObjects()
        {
            return new object[] { "String", 123, 44.55, DateTime.Now };
        }
    }
}

Excel VBA code:

Dim addr As String
addr = "service:mexAddress=""net.tcp://localhost:7891/Test/WcfService1/Service1/Mex"","
addr = addr + "address=""net.tcp://localhost:7891/Test/WcfService1/Service1/"","
addr = addr + "contract=""IService1"", contractNamespace=""http://tempuri.org/"","
addr = addr + "binding=""NetTcpBinding_IService1"", bindingNamespace=""http://tempuri.org/"""

Dim service1 As Object
Set service1 = GetObject(addr)

Dim Sectors( 0 to 2 ) as Integer
Sectors(0) = 10

MsgBox service1.GetData(Sectors)

This code works fine with the WCF Test Client, but when I try to use it from Excel, I have this problem. When Excel gets to the service1.GetData call, it reports the following error:

Run-time error '-2147467261 (80004003)'

Automation error Invalid Pointer

It looks like there is some incompatibility between the interface specification and the VBA call.

Have you ever tried to pass an array from VBA into WCF? Am I doing something wrong or is this not supported using the Service moniker?