问题描述
我已经看到了在某些地方（抱歉，我无法提供的那一刻链接）的形式验证错误显示在顶部的标签。当用户填写了表格，该错误文本相应的变化。
I have seen in certain places (sorry, am unable to provide links at the moment) that validation errors in a form are displayed in a label at the top. As the user fills up the form, that error text changes accordingly.
我可以看到一个明显的，如果... else和处理验证等事件来实现这一（尽管它可以变成是非常繁琐复杂的形式）。有没有更简单的，更清洁的方式做到这一点？
I can see an obvious if...else and handling "Validating" etc events to implement this (though it can turn out to be very tedious for complex forms). Is there a more straightforward, cleaner way to do this?
谢谢！
推荐答案
您应该考虑实施 IDataErrorInfo 在<一个描述href="http://www.$c$cgod.de/WebApp$c$cGod/objectdatasource-and-idataerrorinfo-with-winforms-AID427.aspx"相对=nofollow>这个博客帖子。然后，您可以绑定你的标签到 IDataErrorInfo.Error 属性。加入少许 INotifyPropertyChanged的和您的标签将更新自动神奇。
You should look into implementing IDataErrorInfo as described in this blog post. You can then bind your Label to the IDataErrorInfo.Error property. Add a little INotifyPropertyChanged and your Label will update auto-magically.
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