SortedList.RemoveAt(Int32) Méthode
Définition
Important
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Supprime l'élément à l'index spécifié d'un objet SortedList.
public:
virtual void RemoveAt(int index);
public virtual void RemoveAt (int index);
abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unit
Public Overridable Sub RemoveAt (index As Integer)
Paramètres
- index
- Int32
Index de base zéro de l'élément à supprimer.
Exceptions
index
sort de la plage d'index valides pour l'objet SortedList.
Exemples
L’exemple de code suivant montre comment supprimer des éléments d’un SortedList objet.
#using <system.dll>
using namespace System;
using namespace System::Collections;
void PrintKeysAndValues( SortedList^ myList )
{
Console::WriteLine( "\t-KEY-\t-VALUE-" );
for ( int i = 0; i < myList->Count; i++ )
{
Console::WriteLine( "\t{0}:\t{1}", myList->GetKey( i ), myList->GetByIndex( i ) );
}
Console::WriteLine();
}
int main()
{
// Creates and initializes a new SortedList.
SortedList^ mySL = gcnew SortedList;
mySL->Add( "3c", "dog" );
mySL->Add( "2c", "over" );
mySL->Add( "1c", "brown" );
mySL->Add( "1a", "The" );
mySL->Add( "1b", "quick" );
mySL->Add( "3a", "the" );
mySL->Add( "3b", "lazy" );
mySL->Add( "2a", "fox" );
mySL->Add( "2b", "jumps" );
// Displays the SortedList.
Console::WriteLine( "The SortedList initially contains the following:" );
PrintKeysAndValues( mySL );
// Removes the element with the key "3b".
mySL->Remove( "3b" );
// Displays the current state of the SortedList.
Console::WriteLine( "After removing \"lazy\":" );
PrintKeysAndValues( mySL );
// Removes the element at index 5.
mySL->RemoveAt( 5 );
// Displays the current state of the SortedList.
Console::WriteLine( "After removing the element at index 5:" );
PrintKeysAndValues( mySL );
}
/*
This code produces the following output.
The SortedList initially contains the following:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3b: lazy
3c: dog
After removing "lazy":
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3c: dog
After removing the element at index 5:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
3a: the
3c: dog
*/
using System;
using System.Collections;
public class SamplesSortedList {
public static void Main() {
// Creates and initializes a new SortedList.
SortedList mySL = new SortedList();
mySL.Add( "3c", "dog" );
mySL.Add( "2c", "over" );
mySL.Add( "1c", "brown" );
mySL.Add( "1a", "The" );
mySL.Add( "1b", "quick" );
mySL.Add( "3a", "the" );
mySL.Add( "3b", "lazy" );
mySL.Add( "2a", "fox" );
mySL.Add( "2b", "jumps" );
// Displays the SortedList.
Console.WriteLine( "The SortedList initially contains the following:" );
PrintKeysAndValues( mySL );
// Removes the element with the key "3b".
mySL.Remove( "3b" );
// Displays the current state of the SortedList.
Console.WriteLine( "After removing \"lazy\":" );
PrintKeysAndValues( mySL );
// Removes the element at index 5.
mySL.RemoveAt( 5 );
// Displays the current state of the SortedList.
Console.WriteLine( "After removing the element at index 5:" );
PrintKeysAndValues( mySL );
}
public static void PrintKeysAndValues( SortedList myList ) {
Console.WriteLine( "\t-KEY-\t-VALUE-" );
for ( int i = 0; i < myList.Count; i++ ) {
Console.WriteLine( "\t{0}:\t{1}", myList.GetKey(i), myList.GetByIndex(i) );
}
Console.WriteLine();
}
}
/*
This code produces the following output.
The SortedList initially contains the following:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3b: lazy
3c: dog
After removing "lazy":
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
2c: over
3a: the
3c: dog
After removing the element at index 5:
-KEY- -VALUE-
1a: The
1b: quick
1c: brown
2a: fox
2b: jumps
3a: the
3c: dog
*/
Imports System.Collections
Public Class SamplesSortedList
Public Shared Sub Main()
' Creates and initializes a new SortedList.
Dim mySL As New SortedList()
mySL.Add("3c", "dog")
mySL.Add("2c", "over")
mySL.Add("1c", "brown")
mySL.Add("1a", "The")
mySL.Add("1b", "quick")
mySL.Add("3a", "the")
mySL.Add("3b", "lazy")
mySL.Add("2a", "fox")
mySL.Add("2b", "jumps")
' Displays the SortedList.
Console.WriteLine("The SortedList initially contains the following:")
PrintKeysAndValues(mySL)
' Removes the element with the key "3b".
mySL.Remove("3b")
' Displays the current state of the SortedList.
Console.WriteLine("After removing ""lazy"":")
PrintKeysAndValues(mySL)
' Removes the element at index 5.
mySL.RemoveAt(5)
' Displays the current state of the SortedList.
Console.WriteLine("After removing the element at index 5:")
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.
'
' The SortedList initially contains the following:
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 2c: over
' 3a: the
' 3b: lazy
' 3c: dog
'
' After removing "lazy":
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 2c: over
' 3a: the
' 3c: dog
'
' After removing the element at index 5:
' -KEY- -VALUE-
' 1a: The
' 1b: quick
' 1c: brown
' 2a: fox
' 2b: jumps
' 3a: the
' 3c: dog
Remarques
La séquence d’index est basée sur la séquence de tri. Lorsqu’un élément est ajouté, il est inséré SortedList dans dans l’ordre de tri correct et l’indexation s’ajuste en conséquence. Lorsqu’un élément est supprimé, l’indexation s’ajuste également en conséquence. Par conséquent, l’index d’une paire clé/valeur spécifique peut changer à mesure que des éléments sont ajoutés ou supprimés de l’objet SortedList .
Dans des collections d'éléments contigus, telles que les listes, les éléments qui suivent l'élément supprimé remontent pour occuper l'espace libéré. Si la collection est indexée, les index des éléments déplacés sont également mis à jour. Ce comportement ne s'applique pas aux collections dont les éléments sont regroupés de manière conceptuelle en compartiments, comme par exemple les tables de hachage.
Cette méthode est une O(n)
opération, où n
est Count.