Question

How to check if a string contains only digits in VB.NET

Answer 1

Imports System
Imports System.Linq

Public Class StringContainsOnlyDigits_VB
    Public Shared Function IsDigitsOnly(ByVal str As String) As Boolean
        Return str.All(AddressOf Char.IsDigit)
    End Function

    Public Shared Sub Main(ByVal args As String())
        If IsDigitsOnly("90931587") Then
            Console.WriteLine("yes")
        Else
            Console.WriteLine("no")
        End If

        If IsDigitsOnly("F35F16F15") Then
            Console.WriteLine("yes")
        Else
            Console.WriteLine("no")
        End If
    End Sub
End Class


' run:
'
' yes
' no
'

 

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