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我試圖讓一個ValidationRule在違規組合框上顯示文本,如果用戶還沒有指定一個值。我可以讓它顯示,但我似乎無法使用TextTrimming =「CharacterEllipsis」使文本適合組合框的大小。如何讓TextBlock適合組合框,並且如果用戶調整窗口大小,還可以自行更正?如何使用TextTrimming通過AdornedElementPlaceholder獲取文本塊?
這裏是我的MainWindow.xaml:
<Window x:Class="PocAdornedElementPlaceholder.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:PocAdornedElementPlaceholder"
Title="MainWindow" Height="200" Width="150">
<Window.Resources>
<ControlTemplate x:Key="ValidationTemplate">
<Grid HorizontalAlignment="Center">
<AdornedElementPlaceholder/>
<TextBlock Foreground="Red"
TextTrimming="CharacterEllipsis"
Text="{Binding ErrorContent}"
IsHitTestVisible="False"
VerticalAlignment="Center"
Margin="5,0,0,0"/>
</Grid>
</ControlTemplate>
</Window.Resources>
<Grid>
<ComboBox Margin="10"
Validation.ErrorTemplate="{StaticResource ValidationTemplate}"
VerticalAlignment="Center"
ItemsSource="{Binding Options}">
<ComboBox.Text>
<Binding Path="SelectedValue">
<Binding.ValidationRules>
<local:MyValidationRule ValidatesOnTargetUpdated="True" />
</Binding.ValidationRules>
</Binding>
</ComboBox.Text>
</ComboBox>
</Grid>
</Window>
這裏是我的MainWindow.xaml.cs:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Options = new List<string>() { "Value 1", "Value 2", "Value 3", "" };
this.DataContext = this;
}
public string SelectedValue { get; set; }
public List<string> Options { get; set; }
}
這是我的MyValidationRule.cs文件:
public class MyValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
if (string.IsNullOrEmpty((string)value))
return new ValidationResult(false, "Value cannot be empty!");
return new ValidationResult(true, null);
}
}
任何幫助非常感謝! 謝謝, 譚
非常好!非常感謝! –