Declare array in "Message assignment"

I am calling a webservice that has a parameter that it takes int[]
How can I declare an array in a message assignment and add declared array 
from a schemad valua that has been distinguished promoted and the value is

Data type int.

I cant even declare a array in a "Message assignment" using this code 
System.Int32[] id = { 71486};

But I can declare this is in Windows application

Anyone please help me