限制 [英] restriction

问题描述

如何限制用户在C#中输入特殊字符，字母和数字?

how can i restrict user from inputting special characters, letters and numbers in C#?

推荐答案

if ((e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 8 )
  e.Handled = false;
else
  e.Handled = true;

使用ASCII表设置要按下哪个键，不按下哪个键，此代码可用于仅输入数字数据并允许使用退格键.

use ASCII Table for set that which key you want to be pressed and whichone not, this code can be used for enter only numeric data and allow the backspace .

看看这个最近的问题和答案.这将为您提供帮助，因为显示了许多替代方案.

我应如何检查字母是A到Z还是A到Z [

Have a look at this recent question and the answers. This should help you since a lot of alternatives are shown.

how shall i check the letter is a to z or A to Z[^]

这篇关于限制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！