Question

我有一个view＆＃34; title＆＃34; property和我的datacontext设置为此VM。我有TextBox需要显示窗口的标题，当我在＃34; .cs＆＃34;中进行切换时需要更改它。文件背后。我们怎样才能从＆＃34; .cs＆＃34;文件而不是来自viemodel？

<TextBlock VerticalAlignment="Top" HorizontalAlignment="Left"
           Text="{Binding Title,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}" 
           Margin="10,8,0,0"/>

我正在从MSDN example

中抽取样本

Answer 1

试试这个：

<Window ... Title="{Binding TitleProperty, RelativeSource={RelativeSource Self}}"

如果您打算使用INotifyPropertyChanged更改标题，则代码隐藏类应实现TextBox接口：

<Window x:Class="WpfApplication1.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="{Binding MyTitle, RelativeSource={RelativeSource Self}}" Height="300" Width="300">
    <StackPanel>
        <TextBox Text="{Binding MyTitle, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource AncestorType=Window}}" />
    </StackPanel>
</Window>

public partial class Window1 : Window, INotifyPropertyChanged
{
    public Window1()
    {
        InitializeComponent();
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }

    private string _title;
    public string MyTitle
    {
        get { return _title; }
        set { _title = value; NotifyPropertyChanged(); }
    }
}

将窗口标题绑定到文本

1 个答案: