Hashtable.Remove(Object) Método
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Quita el elemento con la clave especificada de Hashtable.
public:
virtual void Remove(System::Object ^ key);
public virtual void Remove (object key);
abstract member Remove : obj -> unit
override this.Remove : obj -> unit
Public Overridable Sub Remove (key As Object)
Parámetros
- key
- Object
Clave del elemento que se va a quitar.
Implementaciones
Excepciones
key
es null
.
Ejemplos
En el ejemplo siguiente se muestra cómo quitar elementos de .Hashtable
using namespace System;
using namespace System::Collections;
void PrintKeysAndValues( Hashtable^ myHT );
int main()
{
// Creates and initializes a new Hashtable.
Hashtable^ myHT = gcnew Hashtable;
myHT->Add( "1a", "The" );
myHT->Add( "1b", "quick" );
myHT->Add( "1c", "brown" );
myHT->Add( "2a", "fox" );
myHT->Add( "2b", "jumps" );
myHT->Add( "2c", "over" );
myHT->Add( "3a", "the" );
myHT->Add( "3b", "lazy" );
myHT->Add( "3c", "dog" );
// Displays the Hashtable.
Console::WriteLine( "The Hashtable initially contains the following:" );
PrintKeysAndValues( myHT );
// Removes the element with the key "3b".
myHT->Remove( "3b" );
// Displays the current state of the Hashtable.
Console::WriteLine( "After removing \"lazy\":" );
PrintKeysAndValues( myHT );
}
void PrintKeysAndValues( Hashtable^ myHT )
{
IEnumerator^ myEnum = myHT->GetEnumerator();
while ( myEnum->MoveNext() )
{
DictionaryEntry de = *safe_cast<DictionaryEntry ^>(myEnum->Current);
Console::WriteLine( " {0}: {1}", de.Key, de.Value );
}
Console::WriteLine();
}
/*
This code produces the following output.
The Hashtable initially contains the following:
2c: over
3a: the
2b: jumps
3b: lazy
1b: quick
3c: dog
2a: fox
1c: brown
1a: The
After removing "lazy":
2c: over
3a: the
2b: jumps
1b: quick
3c: dog
2a: fox
1c: brown
1a: The
*/
using System;
using System.Collections;
public class SamplesHashtable
{
public static void Main()
{
// Creates and initializes a new Hashtable.
var myHT = new Hashtable();
myHT.Add("1a", "The");
myHT.Add("1b", "quick");
myHT.Add("1c", "brown");
myHT.Add("2a", "fox");
myHT.Add("2b", "jumps");
myHT.Add("2c", "over");
myHT.Add("3a", "the");
myHT.Add("3b", "lazy");
myHT.Add("3c", "dog");
// Displays the Hashtable.
Console.WriteLine("The Hashtable initially contains the following:");
PrintKeysAndValues(myHT);
// Removes the element with the key "3b".
myHT.Remove("3b");
// Displays the current state of the Hashtable.
Console.WriteLine("After removing \"lazy\":");
PrintKeysAndValues(myHT);
}
public static void PrintKeysAndValues(Hashtable myHT)
{
foreach (DictionaryEntry de in myHT)
Console.WriteLine($" {de.Key}: {de.Value}");
Console.WriteLine();
}
}
/*
This code produces the following output.
The Hashtable initially contains the following:
2c: over
3a: the
2b: jumps
3b: lazy
1b: quick
3c: dog
2a: fox
1c: brown
1a: The
After removing "lazy":
2c: over
3a: the
2b: jumps
1b: quick
3c: dog
2a: fox
1c: brown
1a: The
*/
Imports System.Collections
Public Class SamplesHashtable
Public Shared Sub Main()
' Creates and initializes a new Hashtable.
Dim myHT As New Hashtable()
myHT.Add("1a", "The")
myHT.Add("1b", "quick")
myHT.Add("1c", "brown")
myHT.Add("2a", "fox")
myHT.Add("2b", "jumps")
myHT.Add("2c", "over")
myHT.Add("3a", "the")
myHT.Add("3b", "lazy")
myHT.Add("3c", "dog")
' Displays the Hashtable.
Console.WriteLine("The Hashtable initially contains the following:")
PrintKeysAndValues(myHT)
' Removes the element with the key "3b".
myHT.Remove("3b")
' Displays the current state of the Hashtable.
Console.WriteLine("After removing ""lazy"":")
PrintKeysAndValues(myHT)
End Sub
Public Shared Sub PrintKeysAndValues(myHT As Hashtable)
For Each de As DictionaryEntry In myHT
Console.WriteLine($" {de.Key}: {de.Value}")
Next
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
'The Hashtable initially contains the following:
' 1a: The
' 2c: over
' 3c: dog
' 1c: brown
' 2b: jumps
' 3b: lazy
' 1b: quick
' 2a: fox
' 3a: the
'After removing "lazy":
' 1a: The
' 2c: over
' 3c: dog
' 1c: brown
' 2b: jumps
' 1b: quick
' 2a: fox
' 3a: the
Comentarios
Hashtable Si no contiene un elemento con la clave especificada, el objeto Hashtable permanece sin cambios. No se inicia ninguna excepción.
Este método es una O(1)
operación.
Se aplica a
Consulte también
Comentarios
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