Check if an array is read-only or not in C#


To check if an array is read-only or not, try the below code −

Example

 Live Demo

using System;
public class Demo {
   public static void Main(){
      string[] products = new string[] { };
      Console.WriteLine("One or more planets begin with 'E'? = {0}",
         Array.Exists(products, ele => ele.StartsWith("E")));
      Console.WriteLine("Is the array having fixed size? = " + products.IsFixedSize);
      Console.WriteLine("Is the array read only? = " + products.IsReadOnly);
   }
}

Output

This will produce the following code −

One or more planets begin with 'E'? = False
Is the array having fixed size? = True Is the array read only? = False

Example

Let us see another example −

 Live Demo

using System;
public class Demo {
   public static void Main(){
      string[] products = { "Mobiles", "Laptop", "Watches", "Books" };
      Console.WriteLine("Products list...");
      foreach(string s in products){
         Console.WriteLine(s);
      }
      Console.WriteLine("
One or more products begin with the letter 'C'? = {0}",          Array.Exists(products, ele => ele.StartsWith("C")));       Console.WriteLine("One or more planets begin with 'D'? = {0}",          Array.Exists(products, ele => ele.StartsWith("D")));       Console.WriteLine("One or more products begin with the letter 'T'? = {0}",          Array.Exists(products, ele => ele.StartsWith("T")));       Console.WriteLine("One or more planets begin with 'E'? = {0}",          Array.Exists(products, ele => ele.StartsWith("E")));       Console.WriteLine("Is the array read only? = " + products.IsReadOnly);    } }

Output

This will produce the following code −

Products list...
Mobiles
Laptop
Watches
Books
One or more products begin with the letter 'C'? = False
One or more planets begin with 'D'? = False
One or more products begin with the letter 'T'? = False
One or more planets begin with 'E'? = False
Is the array read only? = False

Updated on: 04-Dec-2019

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