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Array.AsReadOnly(T[]) Method in C#
The Array.AsReadOnly(T[]) method in C# returns a read-only wrapper for the specified array, which is the read-only ReadOnlyCollection<T>.
Syntax
public static System.Collections.ObjectModel.ReadOnlyCollection<T> AsReadOnly<T> (T[] array);
Here, T is the type of the elements of the array, whereas array T[] is the one-dimensional zero-based array.
Let us now see an example to implement the Array.AsReadOnly(T[]) method −
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
String[] arr = { "John", "Tom", "Katie", "Brad" };
// read-only IList wrapper
IList<String> list = Array.AsReadOnly( arr );
// Display the values of the read-only IList.
Console.WriteLine( "Initial read-only IList..." );
display( list );
// Let us now change the read-only wrapper
try {
list[0] = "Kevin";
list[1] = "Bradley";
}
catch ( NotSupportedException e ) {
Console.WriteLine(e.GetType());
Console.WriteLine(e.Message );
Console.WriteLine();
}
Console.WriteLine( "After changing two elements, the IList remains the same since it is read-only..." );
display( list );
}
public static void display( IList<String> list ) {
for ( int i = 0; i < list.Count; i++ ) {
Console.WriteLine(list[i] );
}
Console.WriteLine();
}
}Output
This will produce the following output −
Initial read-only IList... John Tom Katie Brad System.NotSupportedException Collection is read-only. After changing two elements, tthe IList remains the same since it is read-only... John Tom Katie Brad
Updated on: 04-Nov-2019
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