Question

How to search in string array in C#

Answer 1

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "php" };

            bool exit = Array.Exists(array, element => element == "csharp");
            if (exit)
                Console.WriteLine("Exist"); // Exist
            else
                Console.WriteLine("Not Exist");

            exit = Array.Exists(array, element => element == "python");
            if (exit)
                Console.WriteLine("Exist");
            else
                Console.WriteLine("Not Exist"); // Not Exist
        }
    }
}

/*
run:
  
Exist
Not Exist

*/

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Answer 2

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string s = Array.Find(array, element => element.StartsWith("ja", StringComparison.Ordinal));
            if (s != null) Console.WriteLine(s); // java

            s = Array.Find(array, element => element.StartsWith("py", StringComparison.Ordinal));
            if (s != null) Console.WriteLine(s); 
        }
    }
}

/*
run:
   
java
 
*/

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Answer 3

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string s = Array.Find(array, element => element.Length == 3);
            if (s != null) Console.WriteLine(s); // c++
        }
    }
}

/*
run:
   
c++
 
*/

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Answer 4

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string[] arr = Array.FindAll(array, element => element.Length <= 3);
            foreach (string s in arr)
                Console.WriteLine(s);
        }
    }
}

/*
run:
   
c++
php
 
*/

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Answer 5

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string[] arr = Array.FindAll(array, element=>element.StartsWith("c", StringComparison.Ordinal));
            foreach (string s in arr) 
                Console.WriteLine(s); 
        }
    }
}

/*
run:
   
c++
csharp
 
*/

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Answer 6

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string s = Array.FindLast(array, element => element.Length == 3);
            if (s != null) Console.WriteLine(s); // php
        }
    }
}

/*
run:
   
php
 
*/

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Answer 7

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c++", "csharp", "java", "php" };

            string s = Array.FindLast(array, element => element.StartsWith("c", StringComparison.Ordinal));
            if (s != null) Console.WriteLine(s); // csharp
        }
    }
}

/*
run:
   
csharp
 
*/

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