WPF開発ノウハウ集

Binding(ComboBox)の実装

Binding List

• Xaml

    <ComboBox ItemsSource="{Binding ComboBox1}" SelectedIndex="{Binding SelectedIndex1}"/>
  

• Xaml.cs コンストラクタの中等

    this.DataContext = <ViewModelのインスタンス>
  

• ViewModel

    using System.Collections.ObjectModel; /* ObservableCollection<T>を使うために記述 */
  
    class ViewModel
    {
        public ObservableCollection<int> ComboBox1 { get; set; } = new ObservableCollection<int>() { 1, 2 };
        public int SelectedIndex1 { get; set; } = 0;
    }
  

Binding Dictionary

• Xaml

    <ComboBox ItemsSource="{Binding ComboBox1}" SelectedValue="{Binding SelectedValue1}"
            SelectedValuePath="Key" DisplayMemberPath="Value"/>
  

• ViewModel

    using System.Collections.Generic; /* Dictionary<TKey,TValue>を使うために記述 */
  
    class ViewModel
    {
        public Dictionary<int, string> ComboBox1 { get; set; } = new Dictionary<int, string>() 
        { 
            { 1, "str1" }, 
            { 2, "str2" } 
        };
        public int SelectedValue1 { get; set; } = 1;
    }