Programming with .NET - General

Re: Missing SelectedValue and SelectedValuePath properties in ComboBox

mahendranvs — Thu, 18 Jun 2009 12:59:41 GMT

While setting the selected item of silverlight combo box, there is an issue. I have tried updatelayout and finally i have inherited and created a new combo control. Then overided the method PrepareContainerForItemOverride and call base method with try catch which works fine. See my post below for sample code.

http://silverlight.net/forums/p/103044/234997.aspx#234997

Re: Missing SelectedValue and SelectedValuePath properties in ComboBox

ZeekJones — Wed, 03 Dec 2008 00:00:10 GMT

http://silverlight.net/forums/p/53720/139118.aspx#139118

http://www.engineserver.com/silverlightcombobox/

Re: Re: Missing SelectedValue and SelectedValuePath properties in ComboBox

spiderman110 — Thu, 13 Nov 2008 09:16:41 GMT

Hi, Harsh.I have one problem with your sample.

I just add a button and in button's click event I write like below:

private void BtnOK_Click(object sender, RoutedEventArgs e)
        {

            ObservableCollection<Name> name = new ObservableCollection<Name>();
            name.Add(new Name { Str = "Harsh" });
            name.Add(new Name { Str = "HarshBardhan" });
            name.Add(new Name { Str = "HarshBardhanHarsh" });
            name.Add(new Name { Str = "Harsh" });

            var Query = from c1 in name
                        //where c1.Str == "Harsh"
                        select new Name { Str = c1.Str };

            mycomboBox.DataContext = Query;
            mycomboBox.DisplayMemberPath = "Str";
            mycomboBox.SelectedIndex = 0;

        }

I changed the selectedIndex from -1 to 0, and when i change the selectedItem of mycomboBox and click the button, error occurs. I know there is something wrong with selectedIndex, but i really want the selectedIndex to be 0.

any suggustions?

Thanks

Re: Missing SelectedValue and SelectedValuePath properties in ComboBox

HarshBardhan — Mon, 20 Oct 2008 10:25:09 GMT

Hi,

you can bind data like this.

//Page.Xaml

            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Str}" />
                        <TextBlock Text="Details" />
                    </StackPanel>

                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>

</StackPanel>

//Page.xaml.cs

      public Page()
        {
            InitializeComponent();
            List<Name> name = new List<Name>();
            name.Add(new Name { Str = "Harsh" });
            name.Add(new Name { Str = "HarshBardhan" });
            name.Add(new Name { Str = "HarshBardhanHarsh" });
            name.Add(new Name { Str = "Harsh" });

            var Query = from c1 in name
                        // where c1.Str == "Harsh"
                        select new Name { Str = c1.Str };

Listbox.SelectedIndex = -1;
Listbox.ItemsSource = Query;
mycomboBox.DataContext=Query;
mycomboBox.DisplayMemberPath="Str";

     }
        public class Name
        {
            private string str;

            public string Str
            {
                get { return str; }
                set { str = value; }
            }
        }

private void mycomboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Name a =mycomboBox.SelectedItem as Name;

        }
        }
    }

Missing SelectedValue and SelectedValuePath properties in ComboBox

sd@sercl.com — Mon, 20 Oct 2008 08:52:31 GMT

Hi,

I'm very surprise to not find the SelectedValue and SelectedValuePath properties in the new ComboBox control. Why this missing and how to do to databind it ?