如何使用C#验证texbox [英] how to validate the texbox using c#

问题描述

我正在开发Windows应用程序，在这里我需要验证文本框，该文本框只能接受数字值，单点(.)，退格键和Delete键.为此，我正在编写此代码

I am developing a windows application where i need to validate the textbox which can accept only numeric value, single dot(.), and backspace and delete key. for this i am writing this code

if ((e.KeyChar=='.' && textBox1.Text.IndexOf('.')>-1) || char.IsLetter(e.KeyChar) || char.IsPunctuation(e.KeyChar) || char.IsSymbol(e.KeyChar))
           {
               e.Handled = true;
           }

但它不接受点号(.)，因为(.)属于标点符号.请帮助我
为此，它接受(.)除外的其他标点符号.

but it is not accepting the dot(.) because (.) comes under punctuation. please help me
to do this which accepts the (.) except others punctuation.

推荐答案

为什么使用文本框?
改用NumericUpDown-它看起来像一个文本框(带有向上和向下箭头)，它像文本框一样工作，但是已经内置了验证功能.

Why use a textbox?
Use a NumericUpDown instead - it looks like a textbox (with an up and a down arrow), it works like a text box, but it has the validation already built in.

简单一点:

It would be a little simpler:

if ((e.KeyChar==''.'' && textBox1.Text.IndexOf(''.'')>-1) || ! e.KeyChar==Keys.Delete && ! e.KeyChar==Keys.Back || !  char.IsDigit(e.KeyChar))
{
  e.Handled = true;
}

hiii，
试试这个

hiii,
try this

if (  char.IsLetter(e.KeyChar) || char.IsPunctuation(e.KeyChar) || char.IsSymbol(e.KeyChar))
           {
               if ((e.KeyChar == '.' && textBox1.Text.IndexOf('.')>-1 ))
               {
                   e.Handled = true;
               }
           }

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