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自定义控件中的 OnValidating 事件

[英]OnValidating Event in a custom control

原文 2009-02-24 14:43:32 9 2 c#/ validation

When does the OnValidate event fire in the life-cycle of a control? OnValidate事件在控件的生命周期中何时触发？

I'm creating a DateBox that will allow the user to enter a date in MM/DD/YYYY format (text) and need to verify that the date is in that format.我正在创建一个DateBox ，它允许用户以 MM/DD/YYYY 格式（文本）输入日期，并且需要验证日期是否采用该格式。 It'll never be converted to a date (stored as string) but I would like to know the best time to validate that data (and provide feedback).它永远不会转换为日期（存储为字符串），但我想知道验证该数据（并提供反馈）的最佳时间。

Note: It may seem a bit like re-inventing the wheel, but the app that I'm writing gets deployed to a tablet-pc and the winforms DateTimePicker is hell to edit with a stylus and my users just want to be able to write in the date.注意：这似乎有点像重新发明轮子，但我正在编写的应用程序被部署到平板电脑和 winforms DateTimePicker用手写笔编辑是地狱，我的用户只想能够写在日期。

2 个解决方案

MaskedTextBox Control might help you. MaskedTextBox 控件可能会对您有所帮助。

OnValidate happens after the Loading events ( source ) OnValidate 发生在 Loading 事件之后（来源）

You should validate on the client-side (javascript) AND server side either using the OnValidate or when handling the submission of the form (or both).您应该使用 OnValidate 或在处理表单提交时（或两者）在客户端（javascript）和服务器端进行验证。