WPF框架和页面获取事件

时间:2018-08-02 06:31:33

标签: wpf events

在wpf中,是否可能在主窗口中捕获frame元素内的页面事件?

 <Window>
   <Grid>
     <TextBlock x:Name="lblEvent"/>
     <Frame Source="Page1.xaml"/>
   </Grid>
</Window>

<Page>
   <Grid>
        <Button Content="Click Me"/>
   </Grid>
</Page>

如果已单击按钮,则主窗口中的文本块会将文本更新为“ Page1 Button click”。

1 个答案:

答案 0 :(得分:0)

如果使用MVVM模式,这将非常容易:

定义您的ViewModel类:

class MyViewModel:INotifyPropertyChanged
{
   private string _LabelText;
   public string LabelText
    {
        get
        {
            return this._LabelText;
        }

        set
        {
            if (value != this._LabelText)
            {
                this._LabelText = value;
                NotifyPropertyChanged();
            }
        }
    }

    private DelegateCommand _ClickCommand;
    public readonly DelegateCommand ClickCommand
    {
        get
        {
            if(_ClickCommand == null)
            {
                _ClickCommand = new DelegateCommand(()=>LabelText="LabelText Changed!");            
            }   
            return _ClickCommand;
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;

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

然后在窗口中设置DataContext

public class MainWindow
{
    private MyViewModel vm;
    public MainWindow()
    {
        InitializeComponent();
        this.vm = new MyViewModel()
        DataContext = vm;
    }
}

在查看代码中设置绑定:

<Window>
   <Grid>
     <TextBlock x:Name="lblEvent" Text="{Binding LabelText}"/>
     <Frame Source="Page1.xaml"/>
   </Grid>
</Window>

<Page>
   <Grid>
        <Button Content="Click Me" Command="{Binding ClickCommand}"/>
   </Grid>
</Page>

如您所见,有任何事件委托,但只有处理按钮单击的命令。您可以在这里找到更多信息:Mvvm Basics; Commands; Prism Command

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