如何通过列表视图作为参数传递给细胞模板的验证规则 [英] How to pass list view as parameter to the validation rule of a cell template

问题描述

我有列表视图小区模板定义如下：

I have a cell template for listview is defined as follows:

<DataTemplate x:Key="editableIPAddressColTemplate">
    <Grid x:Name="dtTemplateGrid">
        <TextBlock Width="100" FontSize="11" Text="{Binding ElementName=txt, Path=Text, Mode=TwoWay}" 
                   ToolTip="{Binding ElementName=txt, Path=ToolTip, Mode=OneWay}"
                        Style="{StaticResource GridBlockStyle}">
        </TextBlock>
        <TextBox x:Name="txt" FontSize="11" Width="100" Style="{StaticResource GridEditStyle}"
                 Validation.Error="TextBox_Error" LostFocus="txt_LostFocus" >
            <Binding Path="IPAddress" Mode="TwoWay" ValidatesOnDataErrors="True" 
                     ValidatesOnExceptions="True" NotifyOnValidationError="True">
                <Binding.ValidationRules>
                    <local:IPAddressValidationRule>
                        <local:IPAddressValidationRule.Params>
                            <local:ValidationParameters BoundListView="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListView}}}"/>
                        </local:IPAddressValidationRule.Params>
                    </local:IPAddressValidationRule>
                </Binding.ValidationRules> 
            </Binding>
        </TextBox>
    </Grid>                
</DataTemplate>

该IPAddressValidationRule从有效性规则派生并有一个名为params属性是类型ValidationParameters的。该ValidationParameters类是从依赖对象派生，并有一个名为BoundListView属性，它是类型的ListView。

The IPAddressValidationRule is derived from ValidationRule and has a property called Params which is of type ValidationParameters. The ValidationParameters class is derived from dependency object and has a property called BoundListView which is of type ListView.

当我通过调试器看到，在一边IPValidationRule类中，BoundListView属性总是空。我究竟做错了什么？

When I see through debugger, in side the IPValidationRule class, the BoundListView property is always null. What am I doing wrong?

我将不胜AP preciate如果有人可以帮助我弄清楚这一点。

I would greatly appreciate if anybody can help me figure out this.

非常感谢在前进。

推荐答案

您在树中的一个突破，验证规则只是漂浮大约为绑定，则不能使用的ElementName 或的RelativeSource 在这样的地方断开。检查输出窗口，你应该能够看到这方面的一些绑定错误。

You have a break in the tree, the validation rules just float about as property of a binding, you cannot use ElementName or RelativeSource in such a disconnected place. Check the output window and you should be able to see some binding errors regarding this.

您可以尝试命名的ListView 和 Binding.Source 使用的 X：参考 （ X：参考不喜欢周期性的依赖关系，所以你需要提防）

You could try naming the ListView and set the Binding.Source using x:Reference (x:Reference does not like cyclical dependencies, so you need to watch out for that)

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