IList.Contains Method

CollectionBase.IList.Contains Method (Object)

.NET Framework (current version)
 

Determines whether the CollectionBase contains a specific element.

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

private abstract Contains : 
        value:Object -> bool
private override Contains : 
        value:Object -> bool

Parameters

value
Type: System.Object

The Object to locate in the CollectionBase.

Return Value

Type: System.Boolean

true if the CollectionBase contains the specified value; otherwise, false.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

This method determines equality by calling Object.Equals.

Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.

The following code example implements the CollectionBase class and uses that implementation to create a collection of Int16 objects.

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

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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