How to get an ID of a selected item in a combobox. C# Metro App

Question

I have a combo box where which gets values from an API. I want to get the ID of the selected item in that combobox because the data in my next view changes based on the value selected here.

My Combobox.

 <ComboBox x:Name="cmbSubjects" HorizontalAlignment="Right" Background="#FFE5DBE8" Width="141" SelectedItem="Maths" Margin="0,217,957,247" ItemsSource="{Binding Source={StaticResource cvsSubjects}}" PlaceholderText="Select"/>

This is how I populate it.

private async void getSubjects()
         {
             try
             {
                 string subjects = baseAddress + "subjects";
                 var cont = await httpClient.GetStringAsync(new Uri(subjects));
                 subjectHelper data = JsonConvert.DeserializeObject<subjectHelper>(cont);

                 foreach (var item in data.result)
                 {
                     cmbSubjects.Items.Add(item.name);
                 }

             }
             catch (Exception ex)
             {
                 MessageDialog messageDialog = new MessageDialog(ex.Message);
                 messageDialog.ShowAsync();
             }

         }

My Classes:

public class Subject
    {
        public int id { get; set; }
        public string name { get; set; }
        public string code { get; set; }
        public string description { get; set; }
        public curriculum curriculam { get; set; }
    }

    class subjectHelper
    {
        public List<Subject> result { get; set; }
    }

    public class unit
    {
        public int id { get; set; }
        public string name { get; set; }
        public string code { get; set; }
        public string description { get; set; }
        public string image { get; set; }
        public int teachingHours { get; set; }
        public int isMandotory { get; set; }
        public Subject subject { get; set; }
    }

    class unitHelper
    {
        public List<unit> result { get; set; }
    }

The user will be able to select the Subject in the combo box so I want it to return the Subject so I can load the units dynamically according to the subject.

Someone please help me do this.. Any kind of help is appreciated......

Answer 1

You need to change your code a little for this.

 <ComboBox x:Name="cmbSubjects" HorizontalAlignment="Right" Background="#FFE5DBE8" Width="141" SelectedItem="Maths" Margin="0,217,957,247" PlaceholderText="Select">            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding name}"/>
                </DataTemplate>
            </ComboBox.ItemTemplate>
</ComboBox>

and set itemssource as follows:

cmbSubjects.ItemsSource=data.Result;

and then in SelectionChanged event

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
  Subject selectedSubject = cmbSubjects.SelectedItem as Subject;
if(selectedSubject!=null){
  int selectedSubID = selectedSubject.ID;}
}