StringCollection.RemoveAt(Int32) Método
Importante
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Remove a cadeia de caracteres no índice especificado do StringCollection.
public:
virtual void RemoveAt(int index);
public void RemoveAt (int index);
abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unit
Public Sub RemoveAt (index As Integer)
- index
- Int32
O índice baseado em zero da cadeia de caracteres a ser removida.
O exemplo de código a seguir remove elementos do StringCollection.
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintValues( IEnumerable^ myCol );
int main()
{
// Creates and initializes a new StringCollection.
StringCollection^ myCol = gcnew StringCollection;
array<String^>^myArr = {"RED","orange","yellow","RED","green","blue","RED","indigo","violet","RED"};
myCol->AddRange( myArr );
Console::WriteLine( "Initial contents of the StringCollection:" );
PrintValues( myCol );
// Removes one element from the StringCollection.
myCol->Remove( "yellow" );
Console::WriteLine( "After removing \"yellow\":" );
PrintValues( myCol );
// Removes all occurrences of a value from the StringCollection.
int i = myCol->IndexOf( "RED" );
while ( i > -1 )
{
myCol->RemoveAt( i );
i = myCol->IndexOf( "RED" );
}
Console::WriteLine( "After removing all occurrences of \"RED\":" );
PrintValues( myCol );
// Clears the entire collection.
myCol->Clear();
Console::WriteLine( "After clearing the collection:" );
PrintValues( myCol );
}
void PrintValues( IEnumerable^ myCol )
{
IEnumerator^ myEnum = myCol->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ obj = safe_cast<Object^>(myEnum->Current);
Console::WriteLine( " {0}", obj );
}
Console::WriteLine();
}
/*
This code produces the following output.
Initial contents of the StringCollection:
RED
orange
yellow
RED
green
blue
RED
indigo
violet
RED
After removing "yellow":
RED
orange
RED
green
blue
RED
indigo
violet
RED
After removing all occurrences of "RED":
orange
green
blue
indigo
violet
After clearing the collection:
*/
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesStringCollection {
public static void Main() {
// Creates and initializes a new StringCollection.
StringCollection myCol = new StringCollection();
String[] myArr = new String[] { "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };
myCol.AddRange( myArr );
Console.WriteLine( "Initial contents of the StringCollection:" );
PrintValues( myCol );
// Removes one element from the StringCollection.
myCol.Remove( "yellow" );
Console.WriteLine( "After removing \"yellow\":" );
PrintValues( myCol );
// Removes all occurrences of a value from the StringCollection.
int i = myCol.IndexOf( "RED" );
while ( i > -1 ) {
myCol.RemoveAt( i );
i = myCol.IndexOf( "RED" );
}
Console.WriteLine( "After removing all occurrences of \"RED\":" );
PrintValues( myCol );
// Clears the entire collection.
myCol.Clear();
Console.WriteLine( "After clearing the collection:" );
PrintValues( myCol );
}
public static void PrintValues( IEnumerable myCol ) {
foreach ( Object obj in myCol )
Console.WriteLine( " {0}", obj );
Console.WriteLine();
}
}
/*
This code produces the following output.
Initial contents of the StringCollection:
RED
orange
yellow
RED
green
blue
RED
indigo
violet
RED
After removing "yellow":
RED
orange
RED
green
blue
RED
indigo
violet
RED
After removing all occurrences of "RED":
orange
green
blue
indigo
violet
After clearing the collection:
*/
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesStringCollection
Public Shared Sub Main()
' Creates and initializes a new StringCollection.
Dim myCol As New StringCollection()
Dim myArr() As [String] = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
myCol.AddRange(myArr)
Console.WriteLine("Initial contents of the StringCollection:")
PrintValues(myCol)
' Removes one element from the StringCollection.
myCol.Remove("yellow")
Console.WriteLine("After removing ""yellow"":")
PrintValues(myCol)
' Removes all occurrences of a value from the StringCollection.
Dim i As Integer = myCol.IndexOf("RED")
While i > - 1
myCol.RemoveAt(i)
i = myCol.IndexOf("RED")
End While
Console.WriteLine("After removing all occurrences of ""RED"":")
PrintValues(myCol)
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("After clearing the collection:")
PrintValues(myCol)
End Sub
Public Shared Sub PrintValues(myCol As IEnumerable)
Dim obj As [Object]
For Each obj In myCol
Console.WriteLine(" {0}", obj)
Next obj
Console.WriteLine()
End Sub
End Class
'This code produces the following output.
'
'Initial contents of the StringCollection:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After removing "yellow":
' RED
' orange
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After removing all occurrences of "RED":
' orange
' green
' blue
' indigo
' violet
'
'After clearing the collection:
'
Em coleções de elementos contíguos, como listas, os elementos que seguem o elemento removido sobem para ocupar o ponto vazio. Caso a coleção seja indexada, os índices dos elementos que são movidos também são atualizados. Este comportamento não se aplica às coleções em que elementos sejam agrupados conceitualmente em buckets, como uma tabela de hash.
Este método é uma operação O(n
), em que n
é Count.
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