如何将嵌套元素的属性绑定到 viewmodel 属性

Question

I have markup like following

XAML

    <ComboBox Grid.Row="0" Margin="15,54,352,231" IsSynchronizedWithCurrentItem="True"
                      ItemsSource="{Binding OptimizationTypes}" DisplayMemberPath="TypeName"
                      SelectedIndex="{Binding SelectedIndex, UpdateSourceTrigger=PropertyChanged}">
                <ComboBox.DataContext >
                    <viewModels:MyViewModel />
                </ComboBox.DataContext>
                <ComboBox.ItemContainerStyle>
                    <Style TargetType="{x:Type ComboBoxItem}">
                        <Setter Property="IsEnabled" Value="{Binding IsItemEnabled}" />
                    </Style>
                </ComboBox.ItemContainerStyle>
            </ComboBox>

ViewModel

using System.Collections.Specialized;

namespace WpfApplication
{
    public class MyViewModel : INotifyCollectionChanged
    {
        public event NotifyCollectionChangedEventHandler CollectionChanged;
        public bool IsItemEnabled { get; set; }

        public MyViewModel(IBaseControlElement baseControlElement)
        {
            //some code
        }
    }
}

The Boolean property IsItemEnabled located on the my viewmodel doesn't accesible for this setter and binding doesn't work. As far as i see binder trying to find the property not in MyViewModel. How to fix it? Can i set datacontext only for the combobox, or there are any others approaches in this case?

Answer 1

尝试

<Setter Property="IsEnabled" Value="{Binding Path=DataContext.IsItemEnabled,RelativeSource={RelativeSource AncestorType=ComboBox}}" />