Question

当用户在＆＃39; whatsYourNameTextbox＆＃39;中输入他/她的名字时并按下Enter键，我想要一个隐藏的文本块（＆＃39; doYouWannaPlayTextblock＆＃39;）变为可见。这是我到目前为止在XAML中所得到的：

 <TextBox x:Name="playerNameTextbox"                            
             Grid.Column="1" Grid.Row="2"
             VerticalAlignment="Top"
             HorizontalAlignment="Center"
             BorderBrush="Black"
             Height="auto" 
             Width="160"
             HorizontalContentAlignment="Center"
             CaretBrush="red"
             FontFamily="Segoe Print"
             FontSize="30"
             ToolTip="Type your name and then press Enter" 
             KeyUp="playerNameTextbox_KeyUp" />

    <TextBlock Grid.Column="0" Grid.Row="3" Grid.ColumnSpan="2"
        x:Name="doYouWannaPlayTextblock" 
        FontFamily="Segoe Print"
        FontSize="16"
        FontWeight="SemiBold"
        Foreground="Red"
        Padding="20"
        Visibility="Hidden"
        TextAlignment="Center"
        TextWrapping="Wrap" Margin="0,0.4,0.2,-25"> 
        Hi,
        <TextBlock Text="{Binding Path=Text, ElementName=playerNameTextbox}"/>
        - it's good to see you. Would you like to play 'Tables'? If so, just click the 'Choose Game' button.
    </TextBlock>

我在Windows窗体中使用了以下内容：

 private void playerOneNameTextbox_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)

            doYouWantToPlayTextbox.Visible = true;
            doYouWantToPlayTextbox.Text = "Hi, " + playerOneNameTextbox.Text + ". " +
            "It's good to see you! " +
            "\r\nWould you like to play with us? " +
            "\r\nIf you would, just click right here in this box.";
            clickToPlayTimer.Start();         
    }

但是当我尝试在WPF中的代码隐藏中使用它时，我无法超越以下内容：

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void playerNameTextbox_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter)
        {
            doYouWannaPlayTextblock.Visibility = Visible;
        }
    }
}

}

在哪里＆＃39;可见＆＃39;以及我尝试过的其他一切，都会引发一个红色的波浪形。

非常感谢任何帮助。

Answer 1

private void playerNameTextbox_KeyUp(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        this.doYouWannaPlayTextblock.Visibility = Visibility.Visible;
    }
}

Answer 2

首先，更改Visibility的正确方法是：

doYouWannaPlayTextblock.Visibility = Visibility.Visible;

其次，您确定要使用KeyUp吗？在这种情况下，KeyDown会更有意义，因为只要您按Enter键就会触发，而不是在您释放它时触发。

第三，如果您的doYouWannaPlayTextblock在您按Enter键之前将不可见，则不需要在XAML中包含文本，因为文本将通过代码设置。添加文本的代码是

doYouWannaPlayTextblock.Text = "Hi, " + playerOneNameTextbox.Text + ". " +
        "It's good to see you! " +
        "\r\nWould you like to play with us? " +
        "\r\nIf you would, just click right here in this box.";

如何制作文本块的可见性＆＃39;可见＆＃39;在文本框中输入文本并按下Enter键时？

2 个答案: