Collection<(Of <(T>)>).IList.IsReadOnly Property

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Gets a value indicating whether the IList is read-only.

Namespace: System.Collections.ObjectModel
Assembly: mscorlib (in mscorlib.dll)


Private ReadOnly Property IsReadOnly As Boolean
    Implements IList.IsReadOnly
bool IList.IsReadOnly { get; }

Property Value

Type: System..::.Boolean
true if the IList is read-only; otherwise, false. In the default implementation of Collection<(Of <(T>)>), this property always returns false.




A collection that is read-only does not allow the addition, removal, or modification of elements after the collection is created.

A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.

Retrieving the value of this property is an O(1) operation.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


Collection<(Of <(T>)>) Class

System.Collections.ObjectModel Namespace