c# check if string is in string array code example

Example 1: c# how to check string is number

string s1 = "123";
string s2 = "abc";

bool isNumber = int.TryParse(s1, out int n); // returns true
isNumber = int.TryParse(s2, out int n); // returns false

Example 2: c# check if string is in array

using System;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] planets = { "Mercury", "Venus",
                "Earth", "Mars", "Jupiter",
                "Saturn", "Uranus", "Neptune" };
          
          	if (planets.Contains("Jupiter"))
            {
              Console.WriteLine("It contains Jupiter");
            }

            Console.WriteLine("One or more planets begin with 'M': {0}",
                Array.Exists(planets, element => element.StartsWith("M")));

            Console.WriteLine("One or more planets begin with 'T': {0}",
                Array.Exists(planets, element => element.StartsWith("T")));

            Console.WriteLine("Is Pluto one of the planets? {0}",
                Array.Exists(planets, element => element == "Pluto"));
        }
    }
}
// The example displays the following output:
//       One or more planets begin with 'M': True
//       One or more planets begin with 'T': False
//       Is Pluto one of the planets? False

Example 3: c# check if array contains value

public static bool Contains(Array a, object val)
    {
        return Array.IndexOf(a, val) != -1;
    }

Example 4: check if string is in string[] c#

Using System.Linq;


if(stringArray.All(stringToCheck.Contains)){
	//Process
}