Determine if it is a number

alt515

There is NAME: I want to determine whether the characters entered by the user are numbers or not.
(I am a newbie just learning C #, please help!)

sulfuresser

Regular expression
using System.Text

if (Regex.IsMatch (this.inputTextbox.Text, @ "^\d + $")
{
// is a number
}
else
{
// not a number
}

wenmy715

Use regular

Regex regex = new Regex (@ "^\d + $");
if (regex.IsMatch (name.Text.Trim ()))
{
   // ...
}

kalian2000

using System.Text.RegularExpressions;

if ((Regex.Match (this.TextBox1.Text.Trim (), @ "^\d + $")). Success)
            {
                // Meet the requirements
            }
            else
            {
                //non-compliant
            }

grancy

using System.Text.RegularExpressions;

if ((Regex.Match (this.TextBox1.Text.Trim (), @ "^\d + $")). Success)
            {
                // OK
            }
            else
            {
                // ERROR,
            }

starsport

The easiest way:

if (Microsoft.VisualBasic.Information.IsNumeric ("asdasds"))
MessageBox.Show ("yes");
else
MessageBox.Show ("no");

kim1981

^\s *\d + $ one or more numbers
 ^\s *\d * $ zero or more digits

冷雨雪

C # determine whether a string is a number
http://www.cnblogs.com/zm235/archive/2006/09/23/512742.html

alt515

Thank you all!!!!!
But can you help me explain what Regex.Match(this.TextBox1.Text.Trim(), @"^\d+$")).Success means, especially @"^\d+$" is there any other way to write it?

nishizhu

Use regular expressions directly in the keypress process