How do I identify if a string is a number in C#?

Let us say our string is −

string str = "3456";

Now, to check whether the entered string is a number or not −

str.All(c => char.IsDigit(c))

The above returns true if the string is a number, else false.

Here is the complete code −

Example

 Live Demo

using System; using System.Linq; namespace Demo {    public class MyApplication {       public static void Main(string[] args) {          string str = "3456";          // checking if string is a number or not          Console.WriteLine(str.All(c => char.IsDigit(c)));       }    } }

Output

True