Re: LINQ: Pass parameter to query

mchlSync — Sun, 06 Jul 2008 02:34:06 GMT

Apples:
client.GetPhotosAsync();

I think this is not correct. It should be like client.GetPhotoAsync(checks);

Re: LINQ: Pass parameter to query

swildermuth — Sat, 05 Jul 2008 23:24:06 GMT

You'll need to pass the state of the check(s) via the GetPhoto's Web Service (adding a parameter there that you'll use in the LINQ query).

LINQ: Pass parameter to query

Apples — Sat, 05 Jul 2008 19:46:00 GMT

I have a couple checkbox on my Page.xaml page. I'm pulling data from the DB and I'd like it to be filtered based on what is checked. I'm passing a list of strings containing the content of the checkboxes that were checked. But I don't know how to pass the list to the query. Here's what I have:

Page.xaml.cs:

        List<string> checks = new List<string>();

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            foreach (Control c in mainCanvas.Children)
            {
                if(c is CheckBox)
                {
                    CheckBox chk = (CheckBox)c;
                    if(chk.IsChecked == true)
                        checks.Add(chk.Content.ToString());
                }
            }

            ServiceReference1.Service1Client client =
                new SmoothFusion.ServiceReference1.Service1Client();

            client.GetPhotosCompleted += new EventHandler<SmoothFusion.ServiceReference1.GetPhotosCompletedEventArgs>(client_GetPhotosCompleted);
            client.GetPhotosAsync();
        }

        void client_GetPhotosCompleted(object sender, SmoothFusion.ServiceReference1.GetPhotosCompletedEventArgs e)
        {
            listBox.ItemsSource = e.Result;
        }

IService1.cs:

    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        List<Pic> GetPhotos(List<string> checks);
    }

Service1.svc.cs:

    public class Service1 : IService1
    {
        #region IService1 Members

        public List<Pic> GetPhotos(List<string> checks)
        {
            DataClasses1DataContext db = new DataClasses1DataContext();

            var query = from attr in db.Attributes
                        where checks.Contains(attr.Attribute1)
                        select attr.AttributeID;

            return query.ToList();
        }

        #endregion
    }

The problem is that the query to pull the data is in the Web portion of my project, and the list of checkboxes is in the other part. So how can I pass my list?

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LINQ: Pass parameter to query