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SortedList.ContainsKey Method

Determines whether a SortedList object contains a specific key.

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

abstract ContainsKey : 
        key:Object -> bool  
override ContainsKey : 
        key:Object -> bool

Parameters

key
Type: System.Object

The key to locate in the SortedList object.

Return Value

Type: System.Boolean
true if the SortedList object contains an element with the specified key; otherwise, false.

ExceptionCondition
ArgumentNullException

key is a null reference (Nothing in Visual Basic).

InvalidOperationException

The comparer throws an exception.

The elements of a SortedList object are sorted by the keys either according to a specific IComparer implementation specified when the SortedList is created or according to the IComparable implementation provided by the keys themselves.

This method behaves exactly as the Contains method.

This method uses a binary search algorithm; therefore, this method is an O(log n) operation, where n is Count.

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 shows how to determine whether a SortedList object contains a specific element.

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 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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