在WPF中将IsEnabled属性绑定到Boolean

Question

我TextBox需要以编程方式启用/禁用.我希望使用绑定到a来实现这一点Boolean.这是TextBoxXAML:

<TextBox Height="424" HorizontalAlignment="Left" 
                 Margin="179,57,0,0" Name="textBox2" 
                 VerticalAlignment="Top" Width="777"
                 TextWrapping="WrapWithOverflow" 
                 ScrollViewer.CanContentScroll="True" 
                 ScrollViewer.VerticalScrollBarVisibility="Auto" 
                 AcceptsReturn="True" AcceptsTab="True" 
                 Text="{Binding Path=Text, UpdateSourceTrigger=PropertyChanged}"
                 IsEnabled="{Binding Path=TextBoxEnabled}"/>

注意Text属性也绑定了; 它功能齐全,这让我觉得它不是DataContext的问题.

但是,当我调用此代码时:

private Boolean _textbox_enabled;
public Boolean Textbox_Enabled
{
    get { return _textbox_enabled; }
    set
    {
        OnPropertyChanged("TextBoxEnabled");
    }
}

这是行不通的.为了提供更多信息,此方法更改了TextBox_Enabled属性:

public void DisabledTextBox()
{
     this.Textbox_Enabled = false;
}

..按下组合键时调用.

Answer 1

这是你的小错字!

    private Boolean _textbox_enabled;
    public Boolean TextboxEnabled // here, underscore typo
    {
        get { return _textbox_enabled; }
        set
        {
            _textbox_enabled = value; // You miss this line, could be ok to do an equality check here to. :)
            OnPropertyChanged("TextboxEnabled"); // 
        }
    }

xaml将文本更新为vm/datacontext的另一件事

Text="{Binding Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsEnabled="{Binding TextBoxEnabled}"/>