[英]Validation rule not being called
I have the following code in my XAML: 我的XAML中有以下代码:
<ItemsControl ItemsSource="{Binding Dimensions}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition MinWidth="100" MaxWidth="300" />
</Grid.ColumnDefinitions>
<Label Grid.Column="0"
Content="Dimension x"
Target="{Binding ElementName=DimTextBox}" />
<TextBox Grid.Column="1" Name="DimTextBox" >
<Binding Path="/" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<valid:DataSetDimensionValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Where Dimensions is an Observable collection of strings. 其中Dimensions是可观察的字符串集合。 It seems to bind ok, I get the expected number of labels and textboxes and the textboxes contain the default value.
似乎绑定成功,我得到了预期数量的标签和文本框,并且这些文本框包含默认值。 However, when I change something in the textbox, my validation rule doesn't get called.
但是,当我在文本框中更改某些内容时,不会调用我的验证规则。
I know it is probably something simple but I am stuck. 我知道这可能很简单,但我被困住了。 Help?
救命?
Try this... 尝试这个...
<TextBox Grid.Column="1" Name="DimTextBox" >
<Binding ValidatesOnExceptions="True" Path="/" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<valid:DataSetDimensionValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox>
Edit: If the above doesn't work, try messing around with these properties on the validation rule: http://msdn.microsoft.com/en-us/library/cc647541.aspx 编辑:如果上述方法不起作用,请尝试验证规则上的以下属性: http : //msdn.microsoft.com/zh-cn/library/cc647541.aspx
I think you just need to set ValidatesOnDataErrors="True" on your binding element so it would look like this. 我认为您只需要在绑定元素上设置ValidatesOnDataErrors =“ True”即可,如下所示。
<TextBox Grid.Column="1" Name="DimTextBox" >
<Binding Path="/" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<valid:DataSetDimensionValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox>
I'm not sure what the problem actually was but when I updated my Dimensions to be an ObservableCollection of DimensionView where DimensionView is my own class containing a Label and a Value it worked. 我不确定实际上是什么问题,但是当我将我的Dimensions更新为DimensionView的ObservableCollection时,其中DimensionView是我自己的包含Label和Value的类。 Code:
码:
<Label Grid.Column="0"
Content="{Binding Label}"
Target="{Binding ElementName=DimTextBox}" />
<TextBox Grid.Column="1" Name="DimTextBox" >
<Binding Path="Value" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<valid:DataSetDimensionValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox>
I guess maybe it just didn't like Path="/" 我想也许只是不喜欢Path =“ /”
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