C#如何检查文本框是否包含数字? [英] C# how to check if textbox contains numbers?
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问题描述
例如我有文本框名称,当然我不能在其中写入数字,因为名称不能是数字,我该怎么检查呢?
我的尝试:
for example i have textbox Name, and of course i can't write in it a number, because the name can't be number,how can i check it?
What I have tried:
string alph = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz";
if (!textBox1.Text.Contains(alph))
{
MessageBox.Show("This field only for letters", "Name");
}
推荐答案
首先,名字可以包含任何内容:John Henderson-Allan是有效的名称。 StopFortnumAndMasonFoieGras Cruelty.com和Brfxxccxxmnpcccclllmmnprxvclmnckssqlbb11116也是如此 - 所以你不应该特别禁止任何名称,不应该禁止任何这些!#
First off, names can contain anything: "John Henderson-Allan" is a valid name. So are "StopFortnumAndMasonFoieGras Cruelty.com" and "Brfxxccxxmnpcccclllmmnprxvclmnckssqlbb11116" - so you shouldn't ban anything in particular from a name, any more than you should ban any of these "!#
% &'* + - / =?^ _`{|}〜来自电子邮件地址。
但是,要将文本框限制为大写和小写字母只使用正则表达式:
%&'*+-/=?^_`{|}~" from an email address.
But, to restrict a textbox to upper and lower case letters only just use a Regex:
Regex regex = new Regex("^[a-zA-Z]+
);
bool hasOnlyAlpha = regex.IsMatch(myTextBox.Text);
"); bool hasOnlyAlpha = regex.IsMatch(myTextBox.Text);
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