如何在Visibility属性上执行简单的XAML(WPF)条件绑定 [英] How to do a simple XAML (WPF) conditional binding on the Visibility property

问题描述

我有一个带有属性的视图模型:

I have got a view model with a property:

public class MyModel
{
    public bool IsEnabled {get;set;}
}

我想使用此属性来切换按钮状态.如果布尔值为true，我想隐藏该按钮，否则将其显示.

I want to use this property to toggle a button state. If the boolean is true I want to hide the button, and otherwise show it.

我尝试过类似的事情:

<Button Visibility= "{Binding IsEnabled ? Hidden : Visible  }">Enable</Button>

但这不合适.

我尝试了一些更复杂的解决方案，但我的猜测是，我缺少一些琐碎的东西.

I tried some more complex solution but my guess is, I am missing something trivial.

有什么建议吗?

推荐答案

由于要在 Hidden 和 Visible 之间切换，并且true处于隐藏状态，因此您可以编写自定义 IValueConverter 或使用简单的 Style.Trigger

Since you want to toggle between Hidden and Visible and true is hidden you can either write custom IValueConverter or use simple Style.Trigger

<Button Content="Enable">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Setter Property="Visibility" Value="Visible"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsEnabled}" Value="True">
                    <Setter Property="Visibility" Value="Hidden"/>
                </DataTrigger>
            </Style.Triggers>                    
        </Style>
    </Button.Style>
</Button>

这全部是假设相应地设置了 DataContext 并且 MyModel.IsEnabled 每次更改都会引发 INotifyPropertyChanged.PropertyChanged 事件

This is all assuming the DataContext is set accordingly and MyModel.IsEnabled raises INotifyPropertyChanged.PropertyChanged event whenever changed

public class MyModel : INotifyPropertyChanged
{
    private bool _isEnabled;

    public bool IsEnabled
    {
        get { return _isEnabled; }
        set
        {
            _isEnabled = value;
            OnPropertyChanged("IsEnabled");
        }
    }

    #region INotifyPropertyChanged

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }

    #endregion
}

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