HashSet(Of T).RemoveWhere Method (Predicate(Of T))
.NET Framework (current version)
Removes all elements that match the conditions defined by the specified predicate from a HashSet(Of T) collection.
Assembly: System.Core (in System.Core.dll)
Parameters
- match
-
Type:
System.Predicate(Of T)
The Predicate(Of T) delegate that defines the conditions of the elements to remove.
Return Value
Type: System.Int32The number of elements that were removed from the HashSet(Of T) collection.
| Exception | Condition |
|---|---|
| ArgumentNullException | match is null. |
The following example demonstrates how to remove values from a HashSet(Of T) collection using the Remove method. In this example, all odd integers are removed from the HashSet(Of T) collection as specified by the match delegate.
Imports System.Collections.Generic Module Example Public Sub Main() Dim numbers As New HashSet(Of Integer)() For i As Integer = 0 To 19 numbers.Add(i) Next i ' Display all the numbers in the hash table. Console.Write("numbers contains {0} elements: ", numbers.Count) DisplaySet(numbers) ' Remove all odd numbers. numbers.RemoveWhere(AddressOf IsOdd) Console.Write("numbers contains {0} elements: ", numbers.Count) DisplaySet(numbers) ' Check if the hash table contains 0 and, if so, remove it. If numbers.Contains(0) Then numbers.Remove(0) End If Console.Write("numbers contains {0} elements: ", numbers.Count) DisplaySet(numbers) End Sub Private Function IsOdd(ByVal i As Integer) As Boolean Return ((i Mod 2) = 1) End Function Private Sub DisplaySet(ByVal coll As HashSet(Of Integer)) Console.Write("{") For Each i As Integer In coll Console.Write(" {0}", i) Next Console.WriteLine(" }") End Sub End Module ' The example displays the following output: ' numbers contains 20 elements: { 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 } ' numbers contains 10 elements: { 0 2 4 6 8 10 12 14 16 18 } ' numbers contains 9 elements: { 2 4 6 8 10 12 14 16 18 }
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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