Question

我是WPF的新手。我的代码如下：

在我的 MainWindow.xaml

中

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="10*"/>
        <RowDefinition Height="50"/>
    </Grid.RowDefinitions>
    <Label HorizontalAlignment="Left" Margin="63,30,0,0" Grid.Row="0" VerticalAlignment="Top" Content="{Binding myVal}" Height="39" Width="71"/>
    <Button Grid.Row="1" x:Name="btnSelect" Content="Select" Click="btnSelect_Click_1" Margin="396,0,10,0"/>
</Grid>

和 MainWindow.cs

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private bool _myboolVal;
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
    }

    private void btnSelect_Click_1(object sender, RoutedEventArgs e)
    {
        if (myVal== false)
        {
            myVal = true;
        }
        else
        {
            myVal= true;
        }
    }

    public bool myVal
    {
        get { return _myboolVal; }
        set { _myboolVal= value; OnPropertyChanged("myVal"); }
    }

    private void OnPropertyChanged(string p)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(p));
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

但标签的值始终为false。

Answer 1

btnSelect_Click_1中的逻辑不正确。将其更新为：

private void btnSelect_Click_1(object sender, RoutedEventArgs e)
{
    myVal = !myVal;
}

Answer 2

看一下这个sample（MVVM，Command binding，MVVMLight）

Answer 3

请将模式设置为TwoWay，然后它将起作用。

Content =“{Binding myVal，Mode = TwoWay}”

如何将布尔值绑定到label

3 个答案: