C# ComboBox IsEnabled属性未更新

当多个属性（或组合在一起）导致false时，我试图禁用组合框中的项。第一次单击组合框时，将调用属性的getter并显示正确的状态。每次单击第一个组合框之后的组合框时，即使属性已更改，也不会再次选中属性（这意味着项目的启用/禁用状态应该不同）

以下是ComboBox项IsEnabled属性的代码：

<!--ItemContainer Style for disabling Combobox Item-->
        <ComboBox.ItemContainerStyle>
            <Style TargetType="ComboBoxItem">
                <Setter Property="IsEnabled" >
                    <Setter.Value>
                        <MultiBinding Converter="{StaticResource orConverterKkey}">
                            <!--<Binding  Source="{StaticResource vm}" Path="NotUseAngleRange" UpdateSourceTrigger="PropertyChanged"/>-->
                            <Binding  Path="IsAxisEnabled" UpdateSourceTrigger="PropertyChanged"/>
                            <Binding  Source="{StaticResource vm}" Path="IsFull180AngleRange" />
                        </MultiBinding>
                    </Setter.Value>
                </Setter>
            </Style>
        </ComboBox.ItemContainerStyle>

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您是否在模型中实现了Inotifypropertychanged..在道具更改时显示vm代码我用视图模型代码更新了问题，这显示了我在何处实现了Inotifypropertychanged。可能设置模式=双向？

public class ViewModelReferenceAxisType : ViewModelBase
{
    public class ReferenceAxisTypeItem : ViewModelBase
    {
    ...
    }
}

public abstract class ViewModelBase : INotifyPropertyChanged, IDisposable
{

    #region INotifyPropertyChanged Members

    /// <summary>
    /// Raised when a property on this object has a new value.
    /// </summary>
    public event PropertyChangedEventHandler PropertyChanged;

    /// <summary>
    /// Raises this object's PropertyChanged event.
    /// </summary>
    /// <param name="propertyName">The property that has a new value.</param>
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = "")
    {
        this.VerifyPropertyName(propertyName);

        if (this.PropertyChanged != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            this.PropertyChanged(this, e);
        }
    }

    #endregion // INotifyPropertyChanged Members