格式化文本框仅接受数字和空格以及加号-Formattextboxtoacceptonlynumbersandwhitespacesandplussign

1  

For having "during input" control and validating control, you can make something like that.

对于“在输入期间”控制和验证控制,您可以制作类似的东西。

But you'll have many things in your textbox (1+++ +2 34+), which doesn't mean a lot...

但是你的文本框中会有很多东西(1 +++ +2 34+),这并不意味着很多......

textBox.KeyDown += (sender, e) =>
                               {
                                   if (!(
                                       //"+
                                       e.KeyCode == Keys.Add || 
                                       //numeric
                                       (e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad9) || 
                                       //space
                                       e.KeyCode == Keys.Space))
                                   {
                                       e.Handled = true;
                                   }
                               };
textBox.Validating += (sender, eventArgs) =>
                                  {
                                      var regex = new Regex(@"[^0-9\+ ]+");
                                      textBox.Text = regex.Replace(textBox.Text, string.Empty);
                                  };

0  

Strictly speaking you could append

严格来说,你可以追加

     && !e.KeyChar == '+' 

to your criteria and it should work as far as keyboard input is concerned , but if the goal is to only allow numeric input the .net control library also contains a NumericUpDown control that can do the trick.

根据您的标准,它应该与键盘输入有关,但如果目标只是允许数字输入,.net控件库还包含一个可以执行此操作的NumericUpDown控件。

0  

Added

var reg = new Regex(@"^\+?(\d[\d-. ]+)?(\([\d-. ]+\))?[\d-. ]+\d$");

var reg = new Regex(@“^ \ +?(\ d [\ d-。] +)?(\([\ d-。] + \))?[\ d-。] + \ d $”) ;

as regex