Dictionary<TKey,TValue>.IDictionary.Remove(Object) メソッド

定義

名前空間:
System.Collections.Generic
アセンブリ:
mscorlib.dll, System.Collections.dll
アセンブリ:
mscorlib.dll
アセンブリ:
System.Collections.dll
アセンブリ:
netstandard.dll

指定したキーを持つ要素を IDictionaryから削除します。

 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

パラメーター

key
Object

削除する要素のキー。

実装

Remove(Object)

例外

ArgumentNullException

key は nullです。

例

次のコード例は、System.Collections.IDictionary インターフェイスのIDictionary.RemoveをDictionary<TKey,TValue>と共に使用する方法を示しています。

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");

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

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

open System
open System.Collections
open System.Collections.Generic

// Create a new dictionary of strings, with string keys,
// and access it using the IDictionary interface.
let openWith: IDictionary = 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")

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

if openWith.Contains "dib" |> not then
    printfn "Key \"dib\" is not found."

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(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

注釈

このメソッドは O(1) 操作に近づく。

適用対象