How to Check if String contains only Numeric Digits in C# - Step by Step Examples

How to Check if String contains only Numeric Digits in C# ?

Answer

To check if a string contains only numeric digits in C#, you can use LINQ to iterate through each character in the string and check if it is a digit using 'char.IsDigit' method.

✐ Examples

1 Check if String contains only Numeric Digits using LINQ and character iteration

In this example,

We create a function 'ContainsOnlyNumericDigits' that takes a string as input.
We use LINQ to iterate through each character in the string and check if it is a digit using 'char.IsDigit' method.
If all characters are numeric digits, 'allDigits' will be 'true', otherwise 'false'.
Finally, we print the result.

C# Program

using System;
using System.Linq;

public class Program
{
    public static bool ContainsOnlyNumericDigits(string str)
    {
        return str.All(char.IsDigit);
    }

    public static void Main()
    {
        string str = "12345";
        bool allDigits = ContainsOnlyNumericDigits(str);
        Console.WriteLine("String contains only numeric digits: " + allDigits);
    }
}

Output

String contains only numeric digits: True

Summary

In this tutorial, we learned How to Check if String contains only Numeric Digits in C# language with well detailed examples.

◀ Previous Next ▶

C# Tutorials

C# How-Tos