C#验证Winforms上文本框的输入

C#验证Winforms上文本框的输入

本文介绍了C#验证Winforms上文本框的输入的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想先检查用户在文本框中写的内容,然后再将其保存到数据库中。做这个的最好方式是什么?我想我总是可以写一些if或try-catch块,但是我想知道是否有更好的方法。我已经阅读了有关验证事件的内容,但不确定如何使用它们。

解决方案

说明



有很多方法可以验证TextBox。您可以在以后每次击键或 Validating 事件中执行此操作。



<$>如果TextBox失去焦点,则会触发c $ c> Validating 事件。例如,当用户单击另一个控件时。如果您设置的 e.Cancel = true ,则TextBox不会失去焦点。



示例验证事件



  private void textBox1_Validating(对象发送者,CancelEventArgs e)
{
if(textBox1.Text!= something)
e.Cancel = true;
}



更新



您可以使用 ErrorProvider 来可视化您的TextBox无效。
检出



更多信息




I want to check what the user is writing in a textbox before I save it in a database. What is the best way to do this? I guess I can always write some ifs or some try-catch blocks, but I was wondering if there's a better method. I've read something about Validating Events, but I am not sure how can I use them.

解决方案

Description

There are many ways to validate your TextBox. You can do this on every keystroke, at a later time, or on the Validating event.

The Validating event gets fired if your TextBox looses focus. When the user clicks on a other Control, for example. If your set e.Cancel = true the TextBox doesn't lose the focus.

Sample Validating Event

private void textBox1_Validating(object sender, CancelEventArgs e)
{
    if (textBox1.Text != "something")
        e.Cancel = true;
}

Update

You can use the ErrorProvider to visualize that your TextBox is not valid.Check out Using Error Provider Control in Windows Forms and C#

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07-26 07:17