Dictionary<TKey,TValue>.IDictionary.Remove(Object) Metodo

Definizione

Spazio dei nomi:

System.Collections.Generic

Assembly:

System.Collections.dll

Origine:

Dictionary.cs

Rimuove l'elemento con la chiave specificata da IDictionary.

 virtual void System.Collections.IDictionary.Remove(System::Object ^ key) = System::Collections::IDictionary::Remove;

void IDictionary.Remove (object key);

abstract member System.Collections.IDictionary.Remove : obj -> unit
override this.System.Collections.IDictionary.Remove : obj -> unit

Sub Remove (key As Object) Implements IDictionary.Remove

Parametri

key

Object

Chiave dell'elemento da rimuovere.

Implementazioni

Remove(Object)

Eccezioni

ArgumentNullException

key è null.

Esempio

Nell'esempio di codice seguente viene illustrato come usare l'oggetto IDictionary.Remove dell'interfaccia System.Collections.IDictionary con un oggetto Dictionary<TKey,TValue>.

L'esempio di codice fa parte di un esempio più ampio, incluso l'output, fornito per il IDictionary.Add metodo .

using System;
using System.Collections;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new dictionary of strings, with string keys,
        // and access it using the IDictionary interface.
        //
        IDictionary openWith = new Dictionary<string, string>();

        // Add some elements to the dictionary. There are no
        // duplicate keys, but some of the values are duplicates.
        // IDictionary.Add throws an exception if incorrect types
        // are supplied for key or value.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

Imports System.Collections
Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new dictionary of strings, with string keys,
        ' and access it using the IDictionary interface.
        '
        Dim openWith As IDictionary = _
            New Dictionary(Of String, String)
        
        ' Add some elements to the dictionary. There are no 
        ' duplicate keys, but some of the values are duplicates.
        ' IDictionary.Add throws an exception if incorrect types
        ' are supplied for key or value.
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

// Use the Remove method to remove a key/value pair. No
// exception is thrown if the wrong data type is supplied.
Console.WriteLine("\nRemove(\"dib\")");
openWith.Remove("dib");

if (!openWith.Contains("dib"))
{
    Console.WriteLine("Key \"dib\" is not found.");
}

' Use the Remove method to remove a key/value pair. No
' exception is thrown if the wrong data type is supplied.
Console.WriteLine(vbLf + "Remove(""dib"")")
openWith.Remove("dib")

If Not openWith.Contains("dib") Then
    Console.WriteLine("Key ""dib"" is not found.")
End If

    }
}

    End Sub

End Class

Commenti

Questo metodo si avvicina a un'operazione O(1).