How do you return an array from a ComVisible dll to JavaScript? RRS feed

  • Question

  • Hi,

    I've been searching and searching and have found various solutions on how to return an array from C#.  In a previous post (http://social.msdn.microsoft.com/Forums/en-US/csharplanguage/thread/71e0d7ff-6531-4caa-9a0e-1cf02ec46318/) a user used this example:

    namespace Example 
        public interface ITesting 
            string Test(); 
            string[] TestArray(); 
        public class Testing : ITesting 
            public string Test() 
                return "TestMethod"
            public string[] TestArray() 
                string[] array = new string[3]; 
                array[0] = "Test"
                array[1] = "Array"
                array[2] = "Method"
                return array; 

    The answer that was suggested was to marshal the array in the interface as a safe array.  This doesn't seem to work at all for JavaScript.  What I get back I can examine in the VS JS debugger and see the value that I'm returning, but the object isn't a proper JS array so there is no length property and I could not retrieve the values using indexing (foo[0] always comes back as undefined).

    After reading this article: http://blogs.msdn.com/ericlippert/archive/2003/09/22/53061.aspx I see that the array that is being returned to JavaScript is a VB type of array.  Indeed, if I treat the returned object as a VBArray, then I can get at the information I need.  I can also call foo.toArray() and get a proper JS array to use.

    My question is, is there a way to return a proper JS array?  Something that I can run through a loop

     for (var i = 0; i < foo.length; i++) { var myString = foo[i]; }

    like this?

    Any help appreaciated.

    Monday, March 9, 2009 12:56 AM





    Thank you for your post!  I would suggest posting your question in one of the  MSDN > Forums Home > JScript > JScript Native located here:  http://social.msdn.microsoft.com/Forums/en-US/jscript/threads/.

    Have a great day!

    Sudarshan shindode Tier 2 Application Support Server and Tools Online Engineering Live Services Team
    • Proposed as answer by sudarshans1 Wednesday, March 18, 2009 5:54 AM
    • Marked as answer by joevolleyball Wednesday, March 18, 2009 4:26 PM
    Wednesday, March 18, 2009 5:54 AM