WPF 值转换器用本地化字符串替换错误代码

Question

我有一个视图模型实现了用于验证的 IDataErrorInfo 接口，对于错误，它会生成一个字符串，该字符串是描述错误的本地化字符串的资源字典中的键。然而，当尝试将以下样式和模板应用于文本框时，我得到了红色边框但没有工具提示，但是删除我的转换器并使用默认转换器给我工具提示但显然不是本地化字符串。

你能看出我做错了什么吗and/or是否有更好的方法？

class MessageCodeToMessageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value != null)
        {
            string messageCode = (string)value;
            try
            {
                return (string)App.Current.Resources[messageCode];
            }
            catch (Exception)
            {
                return messageCode;
            }
        }
        else
        {
            return null;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return "";
    }
}

        <local:MessageCodeToMessageConverter x:Key="Converter"></local:MessageCodeToMessageConverter>
        <Style x:Key="TextBox" TargetType="TextBox">
            <Style.Triggers>
                <Trigger Property="Validation.HasError" Value="true">
                    <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent, Converter={StaticResource Converter}}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
        <ControlTemplate x:Key="ErrorTemplate">
            <DockPanel LastChildFill="True">
                <Border BorderBrush="Red" BorderThickness="1">
                    <AdornedElementPlaceholder />
                </Border>
            </DockPanel>
        </ControlTemplate>

Answer 1

在我看来，如果您的资源密钥在 App.xaml 中定义，那么它应该可以工作。但是您的资源密钥可能在某些用户控件的资源中。 (string)App.Current.Resources[messageCode]; 仅在 App.xaml 资源中搜索。您的解决方案可以使用 multivalueconverter

class MessageCodeToMessageConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter,     System.Globalization.CultureInfo culture)
{
    FrameworkElement targetObject = values[0] as FrameworkElement;
    if (targetObject == null)
    {
       return DependencyProperty.UnsetValue;
    }
    if (value != null)
    {
        string messageCode = (string)values[1];
        try
        {
            return targetObject.FindResource(messageCode);
        }
        catch (Exception)
        {
            return messageCode;
        }
    }
    else
    {
        return null;
    }
}

public object ConvertBack(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    return "";
}
}

和

<Style x:Key="TextBox" TargetType="{x:Type TextBox}">
  <Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
  <Setter Property="ToolTip">
    <Setter.Value>
        <MultiBinding Converter="{StaticResource Converter}">
            <MultiBinding.Bindings>
                <Binding RelativeSource="{RelativeSource Self}" />
                <Binding RelativeSource="{x:Static RelativeSource.Self}" Path="(Validation.Errors)[0].ErrorContent" />
            </MultiBinding.Bindings>
        </MultiBinding>
    </Setter.Value>
  </Setter>
</Trigger>
</Style.Triggers>
</Style>

WPF 值转换器用本地化字符串替换错误代码

WPF Value Converter to replace error code with localized string

.net

c#

wpf

xaml

idataerrorinfo