Dictionary<TKey,TValue>.IDictionary.Contains(Object) 메서드

정의

네임스페이스:
System.Collections.Generic
어셈블리:
mscorlib.dll, System.Collections.dll
어셈블리:
mscorlib.dll
어셈블리:
System.Collections.dll
어셈블리:
netstandard.dll

지정된 키를 가진 요소가 포함되어 있는지 여부를 IDictionary 확인합니다.

 virtual bool System.Collections.IDictionary.Contains(System::Object ^ key) = System::Collections::IDictionary::Contains;
bool IDictionary.Contains(object key);
abstract member System.Collections.IDictionary.Contains : obj -> bool
override this.System.Collections.IDictionary.Contains : obj -> bool
Function Contains (key As Object) As Boolean Implements IDictionary.Contains

매개 변수

key
Object

에서 찾을 키입니다 IDictionary.

반품

Boolean

true IDictionary 지정된 키를 가진 요소가 포함되어 있으면 이고, false그렇지 않으면 .

구현

Contains(Object)

예외

ArgumentNullException

key은 null입니다.

예제

다음 코드 예제에서는 인터페이스의 메서드를 IDictionary.Contains 사용 하는 방법을 보여 있습니다Dictionary<TKey,TValue>.System.Collections.IDictionary 이 예제에서는 잘못된 데이터 형식의 키가 제공된 경우 메서드가 반환 false 되는 것을 보여 줍니다.

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");

        // Contains can be used to test keys before inserting
        // them.
        if (!openWith.Contains("ht"))
        {
            openWith.Add("ht", "hypertrm.exe");
            Console.WriteLine($"""Value added for key = "ht": {openWith["ht"]}""");
        }

        // IDictionary.Contains returns false if the wrong data
        // type is supplied.
        Console.WriteLine($"openWith.Contains(29.7) returns {openWith.Contains(29.7)}");
    }
}

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")

// Contains can be used to test keys before inserting
// them.
if openWith.Contains "ht" |> not then
    openWith.Add("ht", "hypertrm.exe")
    printfn $"""Value added for key = "ht": {openWith["ht"]}"""

// IDictionary.Contains returns false if the wrong data
// type is supplied.
printfn $"openWith.Contains(29.7) returns {openWith.Contains 29.7}"

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")

        ' Contains can be used to test keys before inserting 
        ' them.
        If Not openWith.Contains("ht") Then
            openWith.Add("ht", "hypertrm.exe")
            Console.WriteLine("Value added for key = ""ht"": {0}", _
                openWith("ht"))
        End If

        ' IDictionary.Contains returns False if the wrong data 
        ' type is supplied.
        Console.WriteLine("openWith.Contains(29.7) returns {0}", _
            openWith.Contains(29.7))

    End Sub

End Class

설명

이 메서드는 키 형식에 할당할 수 Dictionary<TKey,TValue>TKey 없는 형식이면 key 반환 false 합니다.

이 메서드는 O(1) 작업에 접근합니다.

적용 대상