Question

我的WPF应用中有一个列表框。这是xaml代码：

  <ListBox Grid.Row="4" Grid.Column="1" Visibility="{Binding lbIsVisible}">
        <ListBoxItem>
            <CheckBox>
                <TextBlock>CITRUS EXPRESS</TextBlock>
            </CheckBox>
        </ListBoxItem>

        <ListBoxItem>
            <CheckBox>
                <TextBlock>APL CALIFORNIA</TextBlock>
            </CheckBox>
        </ListBoxItem>

        <ListBoxItem>
            <CheckBox>
                <TextBlock>IS JAPAN</TextBlock>
            </CheckBox>
        </ListBoxItem>
    </ListBox>

    <CheckBox Grid.Row="3" Grid.Column="1" VerticalAlignment="Center" x:Name="chkSelectVessel" Checked="chkSelectVessel_Checked">
        <TextBlock Text="Select Vessel"></TextBlock>
    </CheckBox>

我试图切换列表框的可见性。这是C＃代码。

public partial class ConfigSetting : Window
{
    public string lbIsVisible { get; set; }

    public ConfigSetting()
    {
        InitializeComponent();
        DataContext = this;
        lbIsVisible = "Hidden";
    }

    private void chkSelectVessel_Checked(object sender, RoutedEventArgs e)
    {
        this.lbIsVisible = "Visible";
    }
}

但它似乎不起作用。我可以说出错的任何一点吗？

Answer 1

你应该像这样使用INotifyPropertyChanged Interface：

public partial class ConfigSetting : Window, INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string lbIsVisible;

    public string LbIsVisible
    {
        get { return lbIsVisible; }
        set
        {
            if (lbIsVisible != value)
            {
                lbIsVisible = value;
                OnPropertyChanged("LbIsVisible");
            }
        }
    }

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

    public ConfigSetting()
    {
        InitializeComponent();
        LbIsVisible = "Hidden";
        DataContext = this;
    }        

    private void chkSelectVessel_Checked(object sender, RoutedEventArgs e)
    {
        LbIsVisible = "Visible";
    }

    private void ChkSelectVessel_OnUnchecked(object sender, RoutedEventArgs e)
    {
        LbIsVisible = "Hidden";
    }
}

在XAML绑定到LbIsVisible属性：

<ListBox Visibility="{Binding LbIsVisible}">

同时将Unchecked事件添加到CheckBox：

<CheckBox Grid.Row="3" Grid.Column="1" VerticalAlignment="Center" 
  x:Name="chkSelectVessel" Checked="chkSelectVessel_Checked" Unchecked="ChkSelectVessel_OnUnchecked">

切换WPF中的列表框显示

1 个答案: