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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
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
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