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ReadOnlyCollection(T).Count Property

Gets the number of elements contained in the ReadOnlyCollection(T) instance.

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

abstract Count : int
override Count : int

Property Value

Type: System.Int32
The number of elements contained in the ReadOnlyCollection(T) instance.

Implements

ICollection(T).Count
ICollection.Count

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

The following code example demonstrates several members of the ReadOnlyCollection(T) class. The code example creates a List(T) of strings and adds four dinosaur names to it. The code example then wraps the list in a ReadOnlyCollection(T).

After demonstrating the Count, Contains, Item, and IList.IndexOf members, the code example shows that the ReadOnlyCollection(T) is just a wrapper for the original List(T) by adding a new item to the List(T) and displaying the contents of the ReadOnlyCollection(T).

Finally, the code example creates an array larger than the collection and uses the CopyTo method to insert the elements of the collection into the middle of the array.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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