监视所有验证事件 [英] Monitor for all validation events

问题描述

非常容易，以检查某些容器或其子容器是否存在验证错误.可以用来禁用保存按钮.

It's quite easy to check if certain container or its children have validation errors. This can be used to disable Save button.

我可以使用计时器

public SomeUserControl()
{
    InitializeComponent();
    var timer = new DispatcherTimer
    {
        Interval = TimeSpan.FromMilliseconds(100),
        IsEnabled = true
    };
    Loaded += (s, e) => buttonSave.IsEnabled = IsValid(grid);
    Unloaded += (s, e) => timer.Stop();
}

轮询和禁用按钮.

<!-- container with lots of controls, bindings and validations -->
<Grid x:Name="grid">
   ...
</Grid>

<!-- save button -->
<Button x:Name="buttonSave" ... />

有更好的方法吗?理想情况下，我想要一个事件.不幸的是，我发现的唯一事件验证.Error 事件，仅可用于具有绑定本身的元素.遍历子元素并订阅(更不用说我必须添加新的子元素了)比投票更糟糕.

Is there a better way? Ideally I want an event. Unfortunately the only event I've found, Validation.Error event, can only be used on the element with bindings itself. Going through children elements and subscribing (not mentioning what I have to deal with adding new children) feels way worser than polling.

有想法吗?

推荐答案

我通常的处理方式如下所示:

The way I usually handle this is illustrated here:

https://social.technet.microsoft.com/wiki/contents/articles/28597.aspx

errorevent将冒泡到容器中，您可以处理它，使用行为或命令将其传递给视图模型.

The errorevent will bubble to a container and you can handle that, use a behavior or command to pass it to the viewmodel.

赞:

<ControlTemplate x:Key="AddingTriggers" TargetType="ContentControl">
    <ControlTemplate.Resources>
        <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource ErrorToolTip}">
            <Setter Property="HorizontalAlignment" Value="Left"/>
        </Style>

    </ControlTemplate.Resources>
    <StackPanel>
        <i:Interaction.Triggers>
            <local:RoutedEventTrigger RoutedEvent="{x:Static Validation.ErrorEvent}">
                <e2c:EventToCommand   Command="{Binding ConversionErrorCommand, Mode=OneWay}"
                                        EventArgsConverter="{StaticResource BindingErrorEventArgsConverter}"
                                        PassEventArgsToCommand="True" />
            </local:RoutedEventTrigger>
        </i:Interaction.Triggers>
        <TextBlock Text="This would be some sort of a common header" Foreground="LightBlue" HorizontalAlignment="Right"/>
        <ContentPresenter/> <!-- This is how you can have variable content "within" the control -->
        <TextBlock Text="This would some sort of a common footer" Foreground="LightBlue"  HorizontalAlignment="Right"/>
    </StackPanel>
</ControlTemplate>

在任何绑定上都需要NotifyOnValidationError = True.

You need NotifyOnValidationError=True on any bindings.

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