WPF ToggleButton IsChecked绑定问题

Question

我试图创建一种情况,ToggleButton任何时候都可以打开两个分组中的一个或两个.我遇到的问题是,如果我更改后备变量的状态,则UI状态不会更新.

我确实已经INotifyPropertyChanged实施了.

我创建了ToggleButton这样的:

        <ToggleButton IsChecked="{Binding Path=IsPermanentFailureState, Mode=TwoWay}"
                      HorizontalContentAlignment="Center"
                      VerticalContentAlignment="Center">
            <TextBlock TextWrapping="Wrap" 
                       TextAlignment="Center">Permanent Failure</TextBlock>
        </ToggleButton>
        <ToggleButton IsChecked="{Binding Path=IsTransitoryFailureState, Mode=TwoWay}"
                      HorizontalContentAlignment="Center"
                      VerticalContentAlignment="Center">
            <TextBlock TextWrapping="Wrap" 
                       TextAlignment="Center">Temporary Failure</TextBlock>
        </ToggleButton>

这是我的支持属性(我使用MVVM模式,其他绑定工作,IE点击ToggleButton确实输入这些属性设置.当我通过代码更改状态时,切换按钮不会改变视觉状态.IE I我将backing属性设置为false,但按钮保持选中状态.

    public bool? IsPermanentFailureState
    {
        get { return isPermFailure; }
        set
        {
            if (isPermFailure != value.Value)
            {
                NotifyPropertyChanged("IsPermanentFailureState");
            }
            isPermFailure = value.Value;
            if (isPermFailure) IsTransitoryFailureState = false;
        }
    }

    public bool? IsTransitoryFailureState
    {
        get { return isTransitoryFailureState; }
        set
        {
            if (isTransitoryFailureState != value.Value)
            {
                NotifyPropertyChanged("IsTransitoryFailureState");
            }
            isTransitoryFailureState = value.Value;
            if (isTransitoryFailureState) IsPermanentFailureState = false;
        }
    }

Answer 1

问题只是您在实际更改属性值之前提出了属性更改通知.因此,WPF读取属性的旧值,而不是新值.改为:

public bool? IsPermanentFailureState
{
    get { return isPermFailure; }
    set
    {
        if (isPermFailure != value.Value)
        {
            isPermFailure = value.Value;
            NotifyPropertyChanged("IsPermanentFailureState");
        }
        if (isPermFailure) IsTransitoryFailureState = false;
    }
}

public bool? IsTransitoryFailureState
{
    get { return isTransitoryFailureState; }
    set
    {
        if (isTransitoryFailureState != value.Value)
        {
            isTransitoryFailureState = value.Value;
            NotifyPropertyChanged("IsTransitoryFailureState");
        }
        if (isTransitoryFailureState) IsPermanentFailureState = false;
    }
}

顺便说一下,你说它在你使用界面而不是代码时有效,但我看不到它可能.