Question

I’m using an ASP.NET application with a web service, and for some reason one of the web service methods gets skipped. I’m sure it’s a fairly simple problem, but it’s had me stumped for over a day. Am I putting the method call in the wrong method, I would assume OnPreRender would handle everything before the page finshes loading. I am fairly confident that the problem is in this area, if I set the form object’s ImageLoc to a URL when it is instantiated it loads in the ASP.NET page just fine.

I don’t think I left out any relevant code, but if you need to see anything else let me know. The form object is just a few properties with get/set so I left it out. Also please note that String parameters will be changed to something else, I am just trying to get the ground work set up.

.aspx.cs :

     localhost.MobileFormServices wsMobile = new localhost.MobileFormServices();

    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
        //Call the web service to pass image URL 
        wsMobile.NewForm("parameters");
        FormImage.ImageUrl = wsMobile.FormProperties().ImageLoc;
    }

web service methods:

   //new form object instance
    private FormLibrary.Form form = new FormLibrary.Form();

    //adds the image location to the form object
    [WebMethod]
    public void NewForm(String parameters)
    {
        form.ImageLoc = "http://www.prelovac.com/vladimir/wp-content/uploads/2008/03/example.jpg"; //breakpoint here, never hit
    }

   [WebMethod]
    public FormLibrary.Form FormProperties() 
    {
        return this.form;
    }

Answer 1

Are you sure web service isn’t called? The call

FormImage.ImageUrl = wsMobile.FormProperties().ImageLoc;

although uses same object instance on your page calls completely different instance on Web Service side than when method

 wsMobile.NewForm("parameters");

was called. Because of that

private FormLibrary.Form form = new FormLibrary.Form();

is called on every web service call.

On every web service call new instance of web service handling the call is created.
So in your example.

1. wsMobile.NewForm(“parameters”) – new FormLibrary.Form is created when instance handling this call is created.

2. in this call you set form.ImageLoc – but this form is local to that instance

3. FormImage.ImageUrl = wsMobile.FormProperties().ImageLoc; – again new FormLibrary.Form is created for instance handling this call

4. you return ImageLoc of new created FormLibrary.Form. Not what you previously set.