MSDN Library

CollectionBase.IList.IsReadOnly Property

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

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

private abstract IsReadOnly : bool with get 
private override IsReadOnly : bool with get

Property Value

Type: System.Boolean
true if the CollectionBase is read-only; otherwise, false. The default is 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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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