Check string in textbox with an event?

Question

我想知道在用户点击OK按钮之前是否有办法使用事件来检查Windows窗体中textBox中的字符串？

Answer 1

You can use the KeyDown, KeyPress, or KeyUp event.

A full list of events can be found here: http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox_events.aspx

It's all alphabetical, so scroll down to Key....

Answer 2

A better approach is to use the Validating event of the textbox. This way, your validation routine runs when the user attempts to leave the textbox.