UWP Combobox binding to SelectedItem property

UWP Combobox binding to SelectedItem property

In UWP, you can bind a ComboBox control to a property on your view model using the SelectedItem property. Here are the steps to do it:

  • Define a property on your view model to hold the selected item.
private MyItem selectedItem; public MyItem SelectedItem { get { return selectedItem; } set { selectedItem = value; RaisePropertyChanged(); } }

In this example, the SelectedItem property is of type MyItem, which represents the type of items in the ComboBox.

  • Bind the ItemsSource property of the ComboBox to a collection of items on your view model.
<ComboBox ItemsSource="{Binding MyItems}" />

In this example, the ItemsSource property is bound to a collection of MyItem objects on the view model.

  • Bind the SelectedItem property of the ComboBox to the SelectedItem property on your view model.
<ComboBox ItemsSource="{Binding MyItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" />

In this example, the SelectedItem property is bound to the SelectedItem property on the view model using a two-way binding, which means that changes to the ComboBox selection will be reflected in the view model and vice versa.

  • Add a DataTemplate to the ComboBox to specify how each item should be displayed.
<ComboBox ItemsSource="{Binding MyItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Name}" /> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox>

In this example, the DataTemplate specifies that each item in the ComboBox should be displayed using a TextBlock control bound to the Name property of the MyItem object.

With these steps, you have bound the ComboBox control to a collection of items on your view model and can access the selected item through the SelectedItem property.

Examples

  1. UWP ComboBox binding SelectedItem MVVM

    • Description: This query focuses on implementing MVVM pattern to bind the SelectedItem property of a ComboBox in UWP.
    // ViewModel public class MainViewModel : INotifyPropertyChanged { private YourModelType _selectedItem; public YourModelType SelectedItem { get { return _selectedItem; } set { _selectedItem = value; OnPropertyChanged(nameof(SelectedItem)); } } // Implement INotifyPropertyChanged } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  2. UWP ComboBox binding SelectedItem with Converter

    • Description: This query involves using a converter to bind the SelectedItem property of a ComboBox in UWP.
    // Converter public class SelectedItemConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, string language) { // Convert your value to ComboBoxItem or any other appropriate type return value; } public object ConvertBack(object value, Type targetType, object parameter, string language) { // Convert your value back to original type return value; } } 
    <!-- XAML --> <Page.Resources> <local:SelectedItemConverter x:Key="SelectedItemConverter"/> </Page.Resources> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Converter={StaticResource SelectedItemConverter}, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  3. UWP ComboBox SelectedItem binding to ViewModel property

    • Description: This query focuses on directly binding the SelectedItem property of a ComboBox to a ViewModel property in UWP.
    // ViewModel public class MainViewModel : INotifyPropertyChanged { private YourModelType _selectedItem; public YourModelType SelectedItem { get { return _selectedItem; } set { _selectedItem = value; OnPropertyChanged(nameof(SelectedItem)); } } // Implement INotifyPropertyChanged } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  4. UWP ComboBox binding SelectedItem to another control

    • Description: This query involves binding the SelectedItem of a ComboBox to another control's property in UWP.
    // ViewModel public class MainViewModel : INotifyPropertyChanged { private YourModelType _selectedItem; public YourModelType SelectedItem { get { return _selectedItem; } set { _selectedItem = value; OnPropertyChanged(nameof(SelectedItem)); // Update other control's property here } } // Implement INotifyPropertyChanged } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  5. UWP ComboBox SelectedItem binding to Enum property

    • Description: This query focuses on binding the SelectedItem property of a ComboBox to an Enum property in UWP.
    // ViewModel public class MainViewModel : INotifyPropertyChanged { private YourEnumType _selectedItem; public YourEnumType SelectedItem { get { return _selectedItem; } set { _selectedItem = value; OnPropertyChanged(nameof(SelectedItem)); } } // Implement INotifyPropertyChanged } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourEnumValues}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"/>

  6. UWP ComboBox SelectedItem binding with UpdateSourceTrigger

    • Description: This query involves using UpdateSourceTrigger to control the update timing of the SelectedItem property of a ComboBox in UWP.
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="YourProperty"/>

  7. UWP ComboBox binding SelectedItem to Nullable property

    • Description: This query focuses on binding the SelectedItem property of a ComboBox to a nullable property in UWP.
    // ViewModel public class MainViewModel : INotifyPropertyChanged { private YourModelType? _selectedItem; public YourModelType? SelectedItem { get { return _selectedItem; } set { _selectedItem = value; OnPropertyChanged(nameof(SelectedItem)); } } // Implement INotifyPropertyChanged } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  8. UWP ComboBox SelectedItem binding to Parent ViewModel property

    • Description: This query involves binding the SelectedItem property of a ComboBox to a property in its parent ViewModel in UWP.
    <!-- Parent ViewModel --> public class ParentViewModel : INotifyPropertyChanged { public MainViewModel ChildViewModel { get; set; } } 
    <!-- XAML --> <ComboBox ItemsSource="{Binding ChildViewModel.YourItems}" SelectedItem="{Binding ChildViewModel.SelectedItem, Mode=TwoWay}" DisplayMemberPath="YourProperty"/>

  9. UWP ComboBox SelectedItem binding with SelectedValuePath

    • Description: This query involves using SelectedValuePath along with SelectedItem to bind the SelectedItem property of a ComboBox in UWP.
    <!-- XAML --> <ComboBox ItemsSource="{Binding YourItems}" SelectedValue="{Binding SelectedItem.YourProperty, Mode=TwoWay}" SelectedValuePath="YourProperty" DisplayMemberPath="YourProperty"/>

  10. UWP ComboBox binding SelectedItem to ControlTemplate property

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