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 with get
override Count : int with get

Property Value

Type: System.Int32

The number of elements contained in the ReadOnlyCollection<'T> instance.

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.

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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