Hashtable.ContainsValue(Object) 메서드
정의
중요
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Hashtable에 특정 값이 들어 있는지 여부를 확인합니다.
public:
virtual bool ContainsValue(System::Object ^ value);public virtual bool ContainsValue (object value);public virtual bool ContainsValue (object? value);abstract member ContainsValue : obj -> bool
override this.ContainsValue : obj -> boolPublic Overridable Function ContainsValue (value As Object) As Boolean매개 변수
반환
지정된 true을 가진 요소가 Hashtable에 포함되어 있으면 value이고, 그렇지 않으면 false입니다.
예제
다음 예제에서는 특정 요소를 포함 하는지 여부를 Hashtable 확인 하는 방법을 보여 줍니다.
using namespace System;
using namespace System::Collections;
void PrintIndexAndKeysAndValues( Hashtable^ myHT );
int main()
{
// Creates and initializes a new Hashtable.
Hashtable^ myHT = gcnew Hashtable;
myHT->Add( (int^)0, "zero" );
myHT->Add( 1, "one" );
myHT->Add( 2, "two" );
myHT->Add( 3, "three" );
myHT->Add( 4, "four" );
// Displays the values of the Hashtable.
Console::WriteLine( "The Hashtable contains the following values:" );
PrintIndexAndKeysAndValues( myHT );
// Searches for a specific key.
int myKey = 2;
Console::WriteLine( "The key \"{0}\" is {1}.", myKey, myHT->ContainsKey( myKey ) ? (String^)"in the Hashtable" : "NOT in the Hashtable" );
myKey = 6;
Console::WriteLine( "The key \"{0}\" is {1}.", myKey, myHT->ContainsKey( myKey ) ? (String^)"in the Hashtable" : "NOT in the Hashtable" );
// Searches for a specific value.
String^ myValue = "three";
Console::WriteLine( "The value \"{0}\" is {1}.", myValue, myHT->ContainsValue( myValue ) ? (String^)"in the Hashtable" : "NOT in the Hashtable" );
myValue = "nine";
Console::WriteLine( "The value \"{0}\" is {1}.", myValue, myHT->ContainsValue( myValue ) ? (String^)"in the Hashtable" : "NOT in the Hashtable" );
}
void PrintIndexAndKeysAndValues( Hashtable^ myHT )
{
int i = 0;
Console::WriteLine( "\t-INDEX-\t-KEY-\t-VALUE-" );
IEnumerator^ myEnum = myHT->GetEnumerator();
while ( myEnum->MoveNext() )
{
DictionaryEntry de = *safe_cast<DictionaryEntry ^>(myEnum->Current);
Console::WriteLine( "\t[{0}]:\t{1}\t{2}", i++, de.Key, de.Value );
}
Console::WriteLine();
}
/*
This code produces the following output.
The Hashtable contains the following values:
-INDEX- -KEY- -VALUE-
[0]: 4 four
[1]: 3 three
[2]: 2 two
[3]: 1 one
[4]: 0 zero
The key "2" is in the Hashtable.
The key "6" is NOT in the Hashtable.
The value "three" is in the Hashtable.
The value "nine" is NOT in the Hashtable.
*/
using System;
using System.Collections;
public class SamplesHashtable
{
public static void Main()
{
// Creates and initializes a new Hashtable.
var myHT = new Hashtable();
myHT.Add(0, "zero");
myHT.Add(1, "one");
myHT.Add(2, "two");
myHT.Add(3, "three");
myHT.Add(4, "four");
// Displays the values of the Hashtable.
Console.WriteLine("The Hashtable contains the following values:");
PrintIndexAndKeysAndValues(myHT);
// Searches for a specific key.
int myKey = 2;
Console.WriteLine("The key \"{0}\" is {1}.", myKey, myHT.ContainsKey(myKey) ? "in the Hashtable" : "NOT in the Hashtable");
myKey = 6;
Console.WriteLine("The key \"{0}\" is {1}.", myKey, myHT.ContainsKey(myKey) ? "in the Hashtable" : "NOT in the Hashtable");
// Searches for a specific value.
var myValue = "three";
Console.WriteLine("The value \"{0}\" is {1}.", myValue, myHT.ContainsValue( myValue ) ? "in the Hashtable" : "NOT in the Hashtable");
myValue = "nine";
Console.WriteLine("The value \"{0}\" is {1}.", myValue, myHT.ContainsValue( myValue ) ? "in the Hashtable" : "NOT in the Hashtable");
}
public static void PrintIndexAndKeysAndValues(Hashtable myHT)
{
int i = 0;
Console.WriteLine("\t-INDEX-\t-KEY-\t-VALUE-");
foreach (DictionaryEntry de in myHT)
Console.WriteLine($"\t[{i++}]:\t{de.Key}\t{de.Value}");
Console.WriteLine();
}
}
/*
This code produces the following output.
The Hashtable contains the following values:
-INDEX- -KEY- -VALUE-
[0]: 4 four
[1]: 3 three
[2]: 2 two
[3]: 1 one
[4]: 0 zero
The key "2" is in the Hashtable.
The key "6" is NOT in the Hashtable.
The value "three" is in the Hashtable.
The value "nine" is NOT in the Hashtable.
*/
Imports System.Collections
Public Class SamplesHashtable
Public Shared Sub Main()
' Creates and initializes a new Hashtable.
Dim myHT As New Hashtable()
myHT.Add(0, "zero")
myHT.Add(1, "one")
myHT.Add(2, "two")
myHT.Add(3, "three")
myHT.Add(4, "four")
' Displays the values of the Hashtable.
Console.WriteLine("The Hashtable contains the following values:")
PrintIndexAndKeysAndValues(myHT)
' Searches for a specific key.
Dim myKey As Integer = 2
Console.Write($"The key ""{myKey}"" is ")
If (myHT.ContainsKey(myKey))
Console.WriteLine("in the Hashtable.")
Else
Console.WriteLine("NOT in the Hashtable.")
End If
myKey = 6
Console.Write($"The key ""{myKey}"" is ")
If (myHT.ContainsKey(myKey))
Console.WriteLine(" in the Hashtable.")
Else
Console.WriteLine(" NOT in the Hashtable.")
End If
' Searches for a specific value.
Dim myValue As String = "three"
Console.Write("The value ""{0}"" is ", myValue)
If (myHT.ContainsValue(myValue))
Console.WriteLine(" in the Hashtable.")
Else
Console.WriteLine(" NOT in the Hashtable.")
End If
myValue = "nine"
Console.Write($"The value ""{myValue}"" is ")
If (myHT.ContainsValue(myValue))
Console.WriteLine(" in the Hashtable.")
Else
Console.WriteLine(" NOT in the Hashtable.")
End If
End Sub
Public Shared Sub PrintIndexAndKeysAndValues(myHT As Hashtable)
Dim i As Integer = 0
Console.WriteLine(vbTab + "-INDEX-" + vbTab + "-KEY-" + vbTab + "-VALUE-")
For Each de As DictionaryEntry In myHT
Console.WriteLine(vbTab + "[{0}]:" + vbTab + "{1}" + vbTab + "{2}", i, de.Key, de.Value)
i += 1
Next
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' The Hashtable contains the following values:
' -INDEX- -KEY- -VALUE-
' [0]: 4 four
' [1]: 3 three
' [2]: 2 two
' [3]: 1 one
' [4]: 0 zero
'
' The key "2" is in the Hashtable.
' The key "6" is NOT in the Hashtable.
' The value "three" is in the Hashtable.
' The value "nine" is NOT in the Hashtable.
설명
요소 Hashtable 의 값은 메서드를 사용하여 Object.Equals 지정된 값과 비교됩니다.
이 메서드는 선형 검색을 수행합니다. 따라서 이 메서드는 O(n) 작업입니다 n Count.
.NET Framework 2.0부터 이 메서드는 컬렉션의 개체 Equals 와 CompareTo 메서드를 item 사용하여 항목이 있는지 여부를 확인합니다. 이전 버전의 .NET Framework 컬렉션에 있는 개체에 Equals 대한 매개 변수의 메서드와 CompareTo 매개 변수를 item 사용하여 이 결정을 내렸습니다.