c# how to check if string contains numbers code example
Example 1: if string contains number c#
"abc3def".Any(c => char.IsDigit(c));
// Or to make it shorter:
"abc3def".Any(char.IsDigit);
Example 2: c# how do you check if a string contains only digits
if (str.All(char.IsDigit)) {
Console.WriteLine("This string only contains numbers");
}