Dictionary<(Of <(TKey, TValue>)>).IDictionary.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 IDictionary is read-only.

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


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

Property Value

Type: System..::.Boolean
true if the IDictionary is read-only; otherwise, false. In the default implementation of Dictionary<(Of <(TKey, TValue>)>), 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.

Getting 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


Dictionary<(Of <(TKey, TValue>)>) Class

System.Collections.Generic Namespace