的AutoPostBack =真为一个文本框和的RequiredFieldValidator旁边。但是，发布回来TextChanged事件的文本框后，提交表单时，的RequiredFieldValidator不起作用？ [英] Autopostback=True for a Textbox and RequiredFieldValidator next to it. But when submitting form after Posting back by TextChanged event to the Textbox, RequiredFieldValidator doesn't work?

问题描述

ASPX表单我有一个文本框（Textbox1的）用的AutoPostBack = TRUE。
我还设置一个RequiredFieldValidator（RequiredFieldValidator1）旁边。但是，Textbox1的的TextChanged事件回发时，RequiredFieldValidator1出现但我仍可以提交自己的状态有什么到Textbox1的！

aspx form I have a textbox (Textbox1) with Autopostback=True. I also set a RequiredFieldValidator (RequiredFieldValidator1) next to it. But when Posting back by TextChanged event of Textbox1, RequiredFieldValidator1 appears but still I can submit my form with nothing into the Textbox1!

什么是错的？

推荐答案

您必须将文本框的CausesValidation属性设置为true（它在默认情况下为文本框设置为false）。

You have to set the textbox's CausesValidation property to true (it's set to false by default for textboxes).

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