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我有這樣的代碼如何在WPF TextBox上顯示無效的Dependency屬性的紅色邊框？
using System.Windows;
namespace TestWpfApplication
{
public partial class Window5 : Window
{
public Window5()
{
InitializeComponent();
}
public int XX
{
get { return (int)GetValue(XXProperty); }
set { SetValue(XXProperty, value); }
}
public static readonly DependencyProperty XXProperty =
DependencyProperty.Register("XX", typeof(int), typeof(Window5), new PropertyMetadata(1),ValidateXX);
private static bool ValidateXX(object value)
{
int? d =value as int?;
var res= d != null && d > 0 && d < 20;
return res;
}
}
}
這XAML
<Window x:Class="TestWpfApplication.Window5"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:TestWpfApplication"
mc:Ignorable="d"
Title="Window5" Height="300" Width="300">
<Grid>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="22" Margin="120,68,0,0" TextWrapping="Wrap" Text="{Binding XX, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:Window5}}, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="120"/>
<TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="22" Margin="96,122,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
</Grid>
我喜歡展示紅色邊框輸入時TextBox中的無效值.. ValidateXX方法，但正常工作紅色邊框不出現在文本框邊框中。