如何将ComboBoxItem标头绑定到Combobox控件的同级ListView的项目数

Question

Why my first item of Combobox display nothing? Anything wrong with my binding?

xaml:

 <Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:system="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="350" Width="525">
  <Grid>
    <Grid.Resources>
    <x:Array x:Key="SettingsContextMenuItems" Type="system:Object">
      <MenuItem Header="{Binding ElementName=MainDataGrid, Path=Items.Count}"/>
      <MenuItem Header="TESTA"/>
      <MenuItem Header="TESTB"/>
    </x:Array>
      </Grid.Resources>
    <Grid.RowDefinitions>
      <RowDefinition Height="auto"/>
      <RowDefinition Height="auto"/>
    </Grid.RowDefinitions>
    <StackPanel>
      <ComboBox ItemsSource="{StaticResource SettingsContextMenuItems}" />
    </StackPanel>
    <StackPanel Grid.Row="1">
      <ListView x:Name="MainDataGrid" ItemsSource="{Binding TestList}"/>
    </StackPanel>
  </Grid>
</Window>

Code behind:

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }
    }

ViewModel:

public class MainViewModel
    {
        private ObservableCollection<Test> testList;

        public ObservableCollection<Test> TestList
        {
            get { return testList; }
            set { testList = value; }
        }

        public MainViewModel()
        {
            TestList = new ObservableCollection<Test>();
            TestList.Add(new Test() { Name = "a" });
            TestList.Add(new Test() { Name = "b" });
            TestList.Add(new Test() { Name = "c" });

        }
    }

Answer 1

Already resolved the issue. Though I don't know why binding in Array doesn't work, putting all the MenuItems into the ComboBox's Items property instead of assign ItemsSource could resolve the problem.

Thanks all the guys replied.

Answer 2

Although i've just read you finally managed to solve your problem, i'm gonna explain the solution i proposed in the coments.

First, we create a ObservableCollection to feed the combobox

private ObservableCollection<MenuItem> menuItems;

public ObservableCollection<MenuItem> MenuItems
{
    get { return menuItems; }
    set { menuItems = value; }
}

Then in the constructor, we initialize the values like this.

MenuItem a = new MenuItem();
a.Header = MainDataGrid.Items.Count;
MenuItem b = new MenuItem();
b.Header = "TESTA";
MenuItem c = new MenuItem();
c.Header = "TESTB";
MenuItems = new ObservableCollection<MenuItem>();
MenuItems.Add(a);
MenuItems.Add(b);
MenuItems.Add(c);

And finally,we bind this collection to the combobox:

<ComboBox ItemsSource="{Binding MenuItems}"/>

This is just to show you the idea. In your real case it maybe has to be tweaked a bit.