How can I get the selected item index of each combobox items in a item Template in Gridview

Question

Hi everyone, I am developing a folder sync app.

Here is the testcase of my codes:

Source codes of my project

In my project I have defined a class that store the folder pair information.

public class FolderPair
        {
            public FolderPair() { }

            public FolderPair(string FolderPairName_Defined_by_User, string SourceFolder_Path, string DestinationFolder_Path, int SycnType)
            {
                This_FolderPairName_Defined_by_User = FolderPairName_Defined_by_User;
                This_SourceFolder_Path = SourceFolder_Path;
                This_DestinationFolder_Path = DestinationFolder_Path;
                This_SycnType = SycnType;
            }

            public string This_FolderPairName_Defined_by_User { get; set; }
            public string This_SourceFolder_Path { get; set; }
            public string This_DestinationFolder_Path { get; set; }
            public int This_SycnType { get; set; }

            // Override the ToString method.
            public override string ToString()
            {
                return This_FolderPairName_Defined_by_User;
            }
        }

Then I defined an ObservableCollection for the folder pairs:

public ObservableCollection<FolderPair> All_FolderPairs_Details = new ObservableCollection<FolderPair>();

And I defined a item template for the folderpair items:

                    

<DataTemplate x:Key="Standard250x250ItemTemplate">
        <Grid HorizontalAlignment="Left" Width="250" Height="250">
            <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
                <Image Source="{Binding Image}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
            </Border>
            <StackPanel VerticalAlignment="Bottom" Background="{StaticResource ListViewItemOverlayBackgroundThemeBrush}">
                <TextBlock Text="{Binding This_SourceFolder_Path}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="60" Margin="15,0,15,0"/>
                <TextBlock Text="{Binding Subtitle}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
                <ComboBox SelectedIndex="{Binding This_SycnType}"  >
                    <ComboBoxItem Content="One-way Sync" />
                    <ComboBoxItem Content="Mirror Sync"/>
                    <ComboBoxItem Content="Two-way Sync"/>

                </ComboBox>
            </StackPanel>
        </Grid>
    </DataTemplate>

To test it, I wrote the following codes:

          

  private void Button_Click(object sender, RoutedEventArgs e)
        {
            All_FolderPairs_Details.Add(new FolderPair("FolderPair1", "SourcePath 1", "DestinationPath 1", 0));
            All_FolderPairs_Details.Add(new FolderPair("FolderPair2", "SourcePath 2", "DestinationPath 2", 1));
            All_FolderPairs_Details.Add(new FolderPair("FolderPair3", "SourcePath 3", "DestinationPath 3", 2));
            GridView1.DataContext = All_FolderPairs_Details;


        }

Here is the effect:

Here are my questions:

Question 1:

Because I want to allow the user to change the sync type whenever they wish, so I need to know which combobox items they selected for each gridview item.

I understood there is a selected items method, but how can I get the combobox item object in the items. I don't know how.

Question 2:

Another question is that for the item template, I have set:

ComboBox SelectedIndex="{Binding This_SycnType}" 

I thought becasue I have set the binding, when the user changed the selected item, the This_SycnType should be changed and return the value in the according folder pair. Why it didn't? 

If you know, please tell me. Thank you very much!

Answer 1

This is too long to take it all in. Please simplify your questions.

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Hi, Matt, simply speaking, I bind my folderpair collection to the item template, then when the users change the selected index of each item(see my screen capture), how can I know which combobox item index they selected for each item(I could't find a way to represent the combox objects in the Gridview item).

Thanks!

Answer 3

Any idea? Thanks!

Answer 4

See http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh758322.aspx for information on setting up a master/detail binding. If that's not what you are looking for then please describe what you are doing and looking for more simply and clearly.

--Rob

Answer 5

Thanks Rob, I think this is the correct way to do it.