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Check if the ArrayList is read-only in C#
To check if the ArrayList is read-only, the code is as follows −
Example
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
ArrayList list1 = new ArrayList();
list1.Add("ABC");
list1.Add("BCD");
list1.Add("CDE");
list1.Add("DEF");
list1.Add("EFG");
list1.Add("GHI");
list1.Add("HIJ");
list1.Add("IJK");
list1.Add("JKL");
list1.Add("KLM");
Console.WriteLine("Elements in ArrayList...");
foreach (string res in list1) {
Console.WriteLine(res);
}
ArrayList list = ArrayList.Synchronized(list1);
Console.WriteLine("Is ArrayList synchronized? = "+list.IsSynchronized);
ArrayList list2 = ArrayList.FixedSize(list1);
Console.WriteLine("Is ArrayList have a fixed size? = "+list2.IsFixedSize);
Console.WriteLine("Is the ArrayList read-only? = "+list1.IsReadOnly);
}
}Output
This will produce the following output −
Elements in ArrayList... ABC BCD CDE DEF EFG GHI HIJ IJK JKL KLM Is ArrayList synchronized? = True Is ArrayList have a fixed size? = True Is the ArrayList read-only? = False
Example
Let us see another example −
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
ArrayList list1 = new ArrayList();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");
list1.Add("E");
list1.Add("F");
Console.WriteLine("Elements in ArrayList1...");
foreach (string res in list1) {
Console.WriteLine(res);
}
Console.WriteLine("Is ArrayList1 synchronized? = "+list1.IsSynchronized);
Console.WriteLine("Is the ArrayList1 read-only? = "+list1.IsReadOnly);
ArrayList list2 = new ArrayList();
list2.Add("A");
list2.Add("B");
list2.Add("C");
list2.Add("D");
list2.Add("E");
list2.Add("F");
Console.WriteLine("Elements in ArrayList2...");
foreach (string res in list2) {
Console.WriteLine(res);
}
Console.WriteLine("Is ArrayList synchronized? = "+list2.IsSynchronized);
Console.WriteLine("Is the ArrayList2 read-only? = "+list2.IsReadOnly);
}
}Output
This will produce the following output −
Elements in ArrayList1... A B C D E F Is ArrayList1 synchronized? = False Is the ArrayList1 read-only? = False Elements in ArrayList2... A B C D E F Is ArrayList synchronized? = False Is the ArrayList2 read-only? = False
Updated on: 06-Dec-2019
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