密码验证错误样式 [英] Password validation error style

问题描述

大家好，

我具有以下验证错误样式，该样式可与文本框完美配合使用，但无法与密码框一起使用.请让我知道此XAML的问题是什么，或者您是否具有用于设置密码验证样式的有用链接.

这里是XAML:

<

样式 TargetType =&; { x : 类型 PasswordBox }">

< Setter 属性 =" Validation.ErrorTemplate>

< Setter.Value >

< ControlTemplate >

< DockPanel LastChildFill =" True>

< TextBlock DockPanel.Dock ="Right" 前景 ="#FF9F513E" FontSize =" 20" 边距 =" 3,0,0,0" FontWeight =粗体" FontFamily ="webdings">< 运行 文本 =&q uot; i"/></ TextBlock >

< 边框 BorderBrush ="#FF9F513E" BorderThickness ="0" 背景 ="#19FFC1C1" IsHitTestVisible =" False">

</ 边框 >

</ DockPanel >

</ ControlTemplate >

</ Setter.Value >

</ Setter >

< Style.Triggers >

< 触发 属性 =" Validation.HasError" 值 =" True>

< Setter 属性 =" ToolTip" 值 =&"; { 绑定 路径 =(验证错误)[ 自我 }}" />

</ 触发 >

</ Style.Triggers >

</ 样式 >

提前感谢...

解决方案

首先，由于Validation.Errors并不总是如此，因此该技术会给您带来绑定错误.可用(请仔细查看您的输出窗口).要解决此问题，您可以使用自定义转换器:

///< summary>
///转换一个包含< see cref ="ValidationError"/>对象返回第一个错误
///或一个空字符串，以防出现错误.
///</summary>
[ValueConversion(typeof(ICollection< ValidationError>)，typeof(string))]
公共类GetFirstValidationErrorConverter:IValueConverter
{
    ///< summary>
    ///转换一个包含< see cref ="ValidationError"/>对象返回第一个错误
    ///或一个空字符串，以防出现错误.
    ///</summary>
    ///< param name =值">要检查的值. </param>同时支持集合和数组.
    ///< param name ="targetType">未使用.
    ///< param name =参数">未使用.
    ///< param name =文化">未使用.</param>
    ///< returns>包含第一个错误的字符串，或者<参见cref ="string.Empty"//在没有错误的情况下.
    公共对象Convert(对象值，类型targetType，对象参数，System.Globalization.CultureInfo文化)
    {
        //检查我们是否有一个有效值
        if(value == null)返回string.Empty;

        //转换值
        ICollection< ValidationError> errorCollection =值为ICollection< ValidationError> ;；
        如果(errorCollection == null)返回string.Empty;

        //返回错误
        返回(errorCollection.Count> 0)吗? errorCollection.First().ErrorContent.ToString():string.Empty;
    }

    ///< summary>
    ///不支持此方法.
    ///</summary>
    ///< param name =值">未使用.</param>
    ///< param name ="targetType">未使用.
    ///< param name =参数">未使用.
    ///< param name =文化">未使用.</param>
    ///< returns>始终为null.</returns>
    公共对象ConvertBack(对象值，类型targetType，对象参数，System.Globalization.CultureInfo文化)
    {
        返回null； //无法进行转换
    }
} 

< Setter属性="ToolTip"值="{Binding RelativeSource = {RelativeSource Self}，Path =(Validation.Errors)，Converter = {StaticResource GetFirstValidationErrorConverter}}"" /> 

Hi all,

I have the following style for validation error that works perfect with text box , but cann't get it working with the passwordbox. Please let me know what is the problem with this XAML , or if you have useful links for styling password validation.

Here is the XAML:

<

 

Style TargetType="{x:Type PasswordBox}">

 

 

<Setter Property="Validation.ErrorTemplate">

 

 

<Setter.Value>

 

 

<ControlTemplate>

 

 

<DockPanel LastChildFill="True">

 

 

<TextBlock DockPanel.Dock="Right" Foreground="#FF9F513E" FontSize="20" Margin="3,0,0,0" FontWeight="Bold" FontFamily="Webdings"><Run Text="i"/></TextBlock>

 

 

<Border BorderBrush="#FF9F513E" BorderThickness="0" Background="#19FFC1C1" IsHitTestVisible="False">

 

 

 

</Border>

 

 

</DockPanel>

 

 

</ControlTemplate>

 

 

</Setter.Value>

 

 

</Setter>

 

 

<Style.Triggers>

 

 

<Trigger Property="Validation.HasError" Value="True">

 

 

<Setter Property="ToolTip" Value="{Binding Path=(Validation.Errors)[0].ErrorContent, RelativeSource={RelativeSource Self}}" />

 

 

</Trigger>

 

 

</Style.Triggers>

 

 

</Style>

Thanks in advance...

解决方案

First of all, this technique will give you binding errors since Validation.Errors is not always available (take a good look at your output window). To fix this, you can use a custom converter:

/// <summary>
/// Converts a collection containing <see cref="ValidationError"/> objects to return the first error
/// or an empty string in case there are no errors.
/// </summary>
[ValueConversion(typeof(ICollection<ValidationError>), typeof(string))]
public class GetFirstValidationErrorConverter : IValueConverter
{
    /// <summary>
    /// Converts a collection containing <see cref="ValidationError"/> objects to return the first error
    /// or an empty string in case there are no errors.
    /// </summary>
    /// <param name="value">Values to check for. Both collections and arrays are supported.</param>
    /// <param name="targetType">Not used.</param>
    /// <param name="parameter">Not used.</param>
    /// <param name="culture">Not used.</param>
    /// <returns>String containing the first error or <see cref="string.Empty"/> in case there are not errors.</returns>
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        // Check if we have a valid value
        if (value == null) return string.Empty;

        // Convert value
        ICollection<ValidationError> errorCollection = value as ICollection<ValidationError>;
        if (errorCollection == null) return string.Empty;

        // Return error
        return (errorCollection.Count > 0) ? errorCollection.First().ErrorContent.ToString() : string.Empty;
    }

    /// <summary>
    /// This method isn't supported.
    /// </summary>
    /// <param name="value">Not used.</param>
    /// <param name="targetType">Not used.</param>
    /// <param name="parameter">Not used.</param>
    /// <param name="culture">Not used.</param>
    /// <returns>Always null.</returns>
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null; // no conversion possible
    }
}

<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors), Converter={StaticResource GetFirstValidationErrorConverter}}" />

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