wpf验证 - 如何在输入时使用此代码来触发验证(cf离开现场时)

Question

如何进行键入时,我如何获得此代码来触发验证(cf离开字段时).下面的代码在验证方面工作正常,但是在离开字段之前它不起作用(而不是在您键入时).

XAML

<Grid.Resources>
    <Style TargetType="{x:Type TextBox}">
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="True">
                <Setter 
                    Property="ToolTip" 
                    Value="{Binding RelativeSource={RelativeSource Self},Path=(Validation.Errors)[0].ErrorContent}" />
            </Trigger>
        </Style.Triggers>
    </Style>

...

                <TextBox IsEnabled="{Binding ElementName=ProxyModeRadioButton, Path=IsChecked}"
                         Width="Auto" Name="ProxyHostTextBox" VerticalAlignment="Center" MinWidth="150" >
                    <TextBox.Text>
                        <Binding Path="Proxy" >
                            <Binding.ValidationRules>
                                <local:SpecialCharactersRule/> 
                            </Binding.ValidationRules>
                        </Binding>
                    </TextBox.Text>
                </TextBox>

谢谢

Answer 1

尝试

<TextBox IsEnabled="{Binding ElementName=ProxyModeRadioButton, UpdateSourceTrigger=PropertyChanged, Path=IsChecked}" Width="Auto" Name="ProxyHostTextBox" VerticalAlignment="Center" MinWidth="150" >
    <TextBox.Text>
        <Binding Path="Proxy" >
            <Binding.ValidationRules>
                <local:SpecialCharactersRule/> 
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

请注意绑定中的UpdateSourceTrigger = PropertyChanged.

UPDATE

正如下面所述的blindmeis,我把UpdateSourceTrigger放在错误的Binding框中..我的错误.它应该与TextBox.Text一起使用.对于那个很抱歉...

<TextBox IsEnabled="{Binding ElementName=ProxyModeRadioButton, Path=IsChecked}" Width="Auto" Name="ProxyHostTextBox" VerticalAlignment="Center" MinWidth="150" >
    <TextBox.Text>
        <Binding Path="Proxy" UpdateSourceTrigger="PropertyChanged" >
            <Binding.ValidationRules>
                <local:SpecialCharactersRule/> 
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>