“Tampilkan judul kotak centang centang WPF” Kode Jawaban

Tampilkan judul kotak centang centang WPF

<ComboBox
    IsEditable="True"
    IsReadOnly="True"
    ItemsSource="{Binding Items}"
    Text="{Binding Text}">
    <ComboBox.ItemTemplate>
        <DataTemplate
            DataType="{x:Type local:Item}">
            <CheckBox
                Content="{Binding Name}"
                IsChecked="{Binding IsChecked}" />
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>
Sore Stork

Tampilkan judul kotak centang centang WPF

// ObservableObject is a custom base class that implements INotifyPropertyChanged
internal class MainWindowVM : ObservableObject
{
    private ObservableCollection<Item> mItems;
    private HashSet<Item> mCheckedItems;

    public IEnumerable<Item> Items { get { return mItems; } }

    public string Text
    {
        get { return _text; }
        set { Set(ref _text, value); }
    }
    private string _text;

    public MainWindowVM()
    {
        mItems = new ObservableCollection<Item>();
        mCheckedItems = new HashSet<Item>();
        mItems.CollectionChanged += Items_CollectionChanged;

        // Adding test data
        for (int i = 0; i < 10; ++i)
        {
            mItems.Add(new Item(string.Format("Item {0}", i.ToString("00"))));
        }
    }

    private void Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.OldItems != null)
        {
            foreach (Item item in e.OldItems)
            {
                item.PropertyChanged -= Item_PropertyChanged;
                mCheckedItems.Remove(item);
            }
        }
        if (e.NewItems != null)
        {
            foreach (Item item in e.NewItems)
            {
                item.PropertyChanged += Item_PropertyChanged;
                if (item.IsChecked) mCheckedItems.Add(item);
            }
        }
        UpdateText();
    }

    private void Item_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == "IsChecked")
        {
            Item item = (Item)sender;
            if (item.IsChecked)
            {
                mCheckedItems.Add(item);
            }
            else
            {
                mCheckedItems.Remove(item);
            }
            UpdateText();
        }
    }

    private void UpdateText()
    {
        switch (mCheckedItems.Count)
        {
            case 0:
                Text = "<none>";
                break;
            case 1:
                Text = mCheckedItems.First().Name;
                break;
            default:
                Text = "<multiple>";
                break;
        }
    }
}

// Test item class
// Test item class
internal class Item : ObservableObject
{
    public string Name { get; private set; }

    public bool IsChecked
    {
        get { return _isChecked; }
        set { Set(ref _isChecked, value); }
    }
    private bool _isChecked;

    public Item(string name)
    {
        Name = name;
    }

    public override string ToString()
    {
        return Name;
    }
}
Sore Stork

Jawaban yang mirip dengan “Tampilkan judul kotak centang centang WPF”

Pertanyaan yang mirip dengan “Tampilkan judul kotak centang centang WPF”

Lebih banyak jawaban terkait untuk “Tampilkan judul kotak centang centang WPF” di C#

Jelajahi jawaban kode populer menurut bahasa

Jelajahi bahasa kode lainnya