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

Last Updated : 11 Jul, 2025
Array.IsReadOnly Property is used to get a value that indicates whether the Array is read-only or not. Syntax: 
public bool IsReadOnly { get; }
Property Value: This property always returns false for all arrays. Below programs illustrate the use of above-discussed property: Example 1:
Output: 
Result: False
Example 2:
Output: 
Result: False
Note:
  • Array implements the IsReadOnly property because it is needed by the System.Collections.IList interface.
  • An array which is read-only does not allow the addition, removal, or modification of elements after the creation of an array.
  • If a user requires a read-only collection, then he or she must use a System.Collections class which implements the System.Collections.IList interface.
  • If a user cast or convert an array to an IList interface object, the IList.IsReadOnly property returns false. However, if the user cast or convert an array to an IList<T> interface, the IsReadOnly property returns true.
  • Retrieving the value of this property is an O(1) operation.
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