如何遍历一个堆栈面板中包含的堆栈面板

Question

我有 3 个 stack panels，其中包含标签，textbox 包含在一个大堆栈面板中，所以它看起来像这样：

 <StackPanel Name="stackControls" Grid.Row="1" Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center">

        <StackPanel HorizontalAlignment="Right" Orientation="Horizontal" Grid.Row="1" VerticalAlignment="Center">
           <Label x:Name="lblName" Content="Broj kase:" Foreground="Black" FontSize="14" VerticalAlignment="Center"/>
           <TextBox Name="txtName" VerticalContentAlignment="Center" FontSize="15"  Foreground="Black" FontFamily="Arial" Style="{StaticResource TextBoxStyle1}" Width="500" Height="45" />
        </StackPanel>

        <StackPanel HorizontalAlignment="Right" Margin="0,5,0,0" Orientation="Horizontal" Grid.Row="1" VerticalAlignment="Center">
          <Label x:Name="lblLastName" Content="Generični printer:" Foreground="Black" FontSize="14" VerticalAlignment="Center"/>
          <TextBox Name="txtLastName" VerticalContentAlignment="Center" FontSize="15"  FontFamily="Arial" Width="500" Style="{StaticResource TextBoxStyle1}" Height="45" />
        </StackPanel>

        <StackPanel HorizontalAlignment="Right" Margin="0,5,0,0" Orientation="Horizontal" Grid.Row="1" VerticalAlignment="Center">
          <Label x:Name="lblHeader" Content="Veličina naslova na gridu:" Foreground="Black" FontSize="14" VerticalAlignment="Center"/>
          <TextBox Name="txtHeader" VerticalContentAlignment="Center" FontSize="15"  FontFamily="Arial" Width="500" Style="{StaticResource TextBoxStyle1}" Height="45" />
        </StackPanel>

</StackPanel>

我必须拒绝用户编辑这些字段 txtName、txtLastName 或 txtHeader 中的任何一个以留下空白字段，所以我想循环遍历每个堆栈面板和每个文本框以检查文本是否为空，如果是的话我会 return 并向他弹出一个消息，如：有些字段是空的，如果我能准确指定哪些字段，那就太棒了，也许我可以为此使用标签..?

这是我目前尝试过的方法：

 foreach (var c in this.stackControls.Children)
 {

    if (c is StackPanel)
    {

       TextBox textBox = c as TextBox;
       if (String.IsNullOrEmpty(textBox.Text))
       {
           MessageBox.Show("Some fields are empty.",
                            "Edit", 
                            MessageBoxButton.OK,
                            MessageBoxImage.Information);
           return;
       }
     }
   }

但是使用上面的这段代码，我总是只循环遍历容器（那 3 个堆栈面板），我不能每个都打开文本框...

谢谢大家干杯

Answer 1

stackControls 堆栈面板的 Children 属性 returns 只有它的
立即 children，即三个堆栈面板。所以你应该使用嵌套循环来获取文本框：

foreach (var childPanel in this.stackControls.Children)
{
    if (childPanel is StackPanel)
    {
       foreach (var c in ((StackPanel)childPanel).Children)
       {
            TextBox textBox = c as TextBox;
            if (String.IsNullOrEmpty(textBox.Text))
            {
                MessageBox.Show("Some fields are empty.",
                            "Edit", 
                            MessageBoxButton.OK,
                            MessageBoxImage.Information);
                return;
            }
        }
    }
}

Answer 2

您可以使用以下辅助方法在可视化树中查找 StackPanel 的所有 TextBox 个子项：

Find all controls in WPF Window by type

foreach (var textBox in FindVisualChildren<TextBox>(stackControls))
{
    if (String.IsNullOrEmpty(textBox.Text))
    {
        MessageBox.Show(textBox.Name + " is empty.",
                            "Edit",
                            MessageBoxButton.OK,
                            MessageBoxImage.Information);
        return;
    }
}

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