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SortedList.TrimToSize Method

Sets the capacity to the actual number of elements in a SortedList object.

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

'Declaration
Public Overridable Sub TrimToSize

ExceptionCondition
NotSupportedException

The SortedList object is read-only.

-or-

The SortedList has a fixed size.

This method can be used to minimize a collection's memory overhead if no new elements will be added to the collection.

To reset a SortedList object to its initial state, call the Clear method before calling TrimToSize. Trimming an empty SortedList sets the capacity of the SortedList to the default capacity.

This method is an O(n) operation, where n is Count.

The following code example shows how to trim the unused portions of a SortedList object and how to clear its values.

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesSortedList    

    Public Shared Sub Main()

        ' Creates and initializes a new SortedList. 
        Dim mySL As New SortedList()
        mySL.Add("one", "The")
        mySL.Add("two", "quick")
        mySL.Add("three", "brown")
        mySL.Add("four", "fox")
        mySL.Add("five", "jumped")

        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("Initially,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)

        ' Trims the SortedList.
        mySL.TrimToSize()

        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After TrimToSize,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)

        ' Clears the SortedList.
        mySL.Clear()

        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After Clear,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)

        ' Trims the SortedList again.
        mySL.TrimToSize()

        ' Displays the count, capacity and values of the SortedList.
        Console.WriteLine("After the second TrimToSize,")
        Console.WriteLine("   Count    : {0}", mySL.Count)
        Console.WriteLine("   Capacity : {0}", mySL.Capacity)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(mySL)
    End Sub    


    Public Shared Sub PrintKeysAndValues(myList As SortedList)
        Console.WriteLine(ControlChars.Tab & "-KEY-" & ControlChars.Tab & _
           "-VALUE-")
        Dim i As Integer 
        For i = 0 To myList.Count - 1
            Console.WriteLine(ControlChars.Tab & "{0}:" & ControlChars.Tab & _
               "{1}", myList.GetKey(i), myList.GetByIndex(i))
        Next i
        Console.WriteLine()
    End Sub 
End Class 

' This code produces the following output. 
'  
' Initially, 
'    Count    : 5 
'    Capacity : 16 
'    Values: 
'     -KEY-    -VALUE- 
'     five:    jumped 
'     four:    fox 
'     one:    The 
'     three:    brown 
'     two:    quick 

' After TrimToSize, 
'    Count    : 5 
'    Capacity : 5 
'    Values: 
'     -KEY-    -VALUE- 
'     five:    jumped 
'     four:    fox 
'     one:    The 
'     three:    brown 
'     two:    quick 
'  
' After Clear, 
'    Count    : 0 
'    Capacity : 16 
'    Values: 
'     -KEY-    -VALUE- 
' 
'
' After the second TrimToSize, 
'    Count    : 0 
'    Capacity : 16 
'    Values: 
'     -KEY-    -VALUE-

.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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