ArrayList.ReadOnly Method (IList)

Returns a read-only IList wrapper.

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

public static IList ReadOnly(
	IList list
)

Parameters

list
Type: System.Collections.IList

The IList to wrap.

Return Value

Type: System.Collections.IList
A read-only IList wrapper around list.

ExceptionCondition
ArgumentNullException

list is null.

To prevent any modifications to list, expose list only through this wrapper.

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

This method is an O(1) operation.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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