如何创建WPF验证规则以确保两个文本字段具有相同的值? [英] How to create a WPF validation rule to ensure two text fields have the same value?

问题描述

如何创建验证规则以确保Value2与Value1具有相同的值?如果验证规则不是最佳方法，那么哪个更好呢?我可以让TextChanged事件处理此事件，但我想知道是否还有更优雅的方法.

 < TextBox名称="Value1TextBox">< TextBox.Text>< BindingPath Path ="Value1" UpdateSourceTrigger ="PropertyChanged"/></TextBox.Text></TextBox>< TextBox Name ="Value2TextBox">< TextBox.Text>< BindingPath Path ="Value2" UpdateSourceTrigger ="PropertyChanged"/></TextBox.Text></TextBox> 

解决方案

就像实现 System.ComponentModel.IDataErrorInfo 接口并添加 ValidatesOnDataErrors 一样.

>

 < TextBox名称="Value2TextBox">< TextBox.Text>< BindingPath Path ="Value2" UpdateSourceTrigger ="PropertyChanged" ValidatesOnDataErrors ="True"/></TextBox.Text></TextBox> 

How would I create a validation rule to ensure Value2 has the same value as Value1? If a validation rule is not the best method then what would be better? I could have the TextChanged event handle this, but I'm wondering if there is something more elegant.

<TextBox Name="Value1TextBox">
    <TextBox.Text>
        <BindingPath Path="Value1" UpdateSourceTrigger="PropertyChanged" />
    </TextBox.Text>
</TextBox>

<TextBox Name="Value2TextBox">
    <TextBox.Text>
        <BindingPath Path="Value2" UpdateSourceTrigger="PropertyChanged" />
    </TextBox.Text>
</TextBox>

解决方案

Looks like implementing the System.ComponentModel.IDataErrorInfo interface and adding ValidatesOnDataErrors did the trick.

<TextBox Name="Value2TextBox">    
    <TextBox.Text>        
        <BindingPath Path="Value2" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True" />
    </TextBox.Text>
</TextBox>

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