String.GetHashCode 메서드

지정된 규칙을 사용하여 제공된 읽기 전용 문자 범위의 해시 코드를 반환합니다.Returns the hash code for the provided read-only character span using the specified rules.

public:
 static int GetHashCode(ReadOnlySpan<char> value, StringComparison comparisonType);

public static int GetHashCode (ReadOnlySpan<char> value, StringComparison comparisonType);

static member GetHashCode : ReadOnlySpan<char> * StringComparison -> int

Public Shared Function GetHashCode (value As ReadOnlySpan(Of Char), comparisonType As StringComparison) As Integer

매개 변수

반환

지정된 규칙을 사용하여 이 문자열의 해시 코드를 반환합니다.Returns the hash code for this string using the specified rules.

public:
 int GetHashCode(StringComparison comparisonType);

public int GetHashCode (StringComparison comparisonType);

override this.GetHashCode : StringComparison -> int

Public Function GetHashCode (comparisonType As StringComparison) As Integer

매개 변수

반환

해당 문자열에 대한 해시 코드를 반환합니다.Returns the hash code for this string.

public:
 override int GetHashCode();

public override int GetHashCode ();

override this.GetHashCode : unit -> int

Public Overrides Function GetHashCode () As Integer

반환

예제

다음 예제는 GetHashCode 다양 한를 사용 하 여 메서드 입력 문자열입니다.The following example demonstrates the GetHashCode method using various input strings.

using namespace System;

void DisplayHashCode( String^ Operand )
{
   int HashCode = Operand->GetHashCode();
   Console::WriteLine( "The hash code for \"{0}\" is: 0x{1:X8}, {1}", Operand, HashCode );
}

int main()
{
   DisplayHashCode( "" );
   DisplayHashCode( "a" );
   DisplayHashCode( "ab" );
   DisplayHashCode( "abc" );
   DisplayHashCode( "abd" );
   DisplayHashCode( "abe" );
   DisplayHashCode( "abcdef" );
   DisplayHashCode( "abcdeg" );
   DisplayHashCode( "abcdeh" );
   DisplayHashCode( "abcdei" );
   DisplayHashCode( "Abcdeg" );
   DisplayHashCode( "Abcdeh" );
   DisplayHashCode( "Abcdei" );
}

/*
This example displays output like the following:
      The hash code for "" is: 0x2D2816FE, 757602046
      The hash code for "a" is: 0xCDCAB7BF, -842352705
      The hash code for "ab" is: 0xCDE8B7BF, -840386625
      The hash code for "abc" is: 0x2001D81A, 536991770
      The hash code for "abd" is: 0xC2A94CB5, -1029092171
      The hash code for "abe" is: 0x6550C150, 1699791184
      The hash code for "abcdef" is: 0x1762906D, 392335469
      The hash code for "abcdeg" is: 0x1763906D, 392401005
      The hash code for "abcdeh" is: 0x175C906D, 391942253
      The hash code for "abcdei" is: 0x175D906D, 392007789
      The hash code for "Abcdeg" is: 0x1763954D, 392402253
      The hash code for "Abcdeh" is: 0x175C954D, 391943501
      The hash code for "Abcdei" is: 0x175D954D, 392009037
*/

using System;

class GetHashCode 
{
    public static void Main() 
    {
        DisplayHashCode( "" );
        DisplayHashCode( "a" );
        DisplayHashCode( "ab" );
        DisplayHashCode( "abc" );
        DisplayHashCode( "abd" );
        DisplayHashCode( "abe" );
        DisplayHashCode( "abcdef" );
        DisplayHashCode( "abcdeg" );
        DisplayHashCode( "abcdeh" );
        DisplayHashCode( "abcdei" );
        DisplayHashCode( "Abcdeg" );
        DisplayHashCode( "Abcdeh" );
        DisplayHashCode( "Abcdei" );
    }

    static void DisplayHashCode( String Operand )
    {
        int     HashCode = Operand.GetHashCode( );
        Console.WriteLine("The hash code for \"{0}\" is: 0x{1:X8}, {1}",
                          Operand, HashCode );
    }
}
/*
      This example displays output like the following:
      The hash code for "" is: 0x2D2816FE, 757602046
      The hash code for "a" is: 0xCDCAB7BF, -842352705
      The hash code for "ab" is: 0xCDE8B7BF, -840386625
      The hash code for "abc" is: 0x2001D81A, 536991770
      The hash code for "abd" is: 0xC2A94CB5, -1029092171
      The hash code for "abe" is: 0x6550C150, 1699791184
      The hash code for "abcdef" is: 0x1762906D, 392335469
      The hash code for "abcdeg" is: 0x1763906D, 392401005
      The hash code for "abcdeh" is: 0x175C906D, 391942253
      The hash code for "abcdei" is: 0x175D906D, 392007789
      The hash code for "Abcdeg" is: 0x1763954D, 392402253
      The hash code for "Abcdeh" is: 0x175C954D, 391943501
      The hash code for "Abcdei" is: 0x175D954D, 392009037
*/

Module GetHashCode
    Sub Main()
        DisplayHashCode("")
        DisplayHashCode("a")
        DisplayHashCode("ab")
        DisplayHashCode("abc")
        DisplayHashCode("abd")
        DisplayHashCode("abe")
        DisplayHashCode("abcdef")
        DisplayHashCode("abcdeg")
        DisplayHashCode("abcdeh")
        DisplayHashCode("abcdei")
        DisplayHashCode("Abcdeg")
        DisplayHashCode("Abcdeh")
        DisplayHashCode("Abcdei")
    End Sub
       
    Sub DisplayHashCode(Operand As String)
        Dim HashCode As Integer = Operand.GetHashCode()
        Console.WriteLine("The hash code for ""{0}"" is: 0x{1:X8}, {1}", 
                          Operand, HashCode)
    End Sub 
End Module 
' This example displays output like the following:
'       The hash code for "" is: 0x2D2816FE, 757602046
'       The hash code for "a" is: 0xCDCAB7BF, -842352705
'       The hash code for "ab" is: 0xCDE8B7BF, -840386625
'       The hash code for "abc" is: 0x2001D81A, 536991770
'       The hash code for "abd" is: 0xC2A94CB5, -1029092171
'       The hash code for "abe" is: 0x6550C150, 1699791184
'       The hash code for "abcdef" is: 0x1762906D, 392335469
'       The hash code for "abcdeg" is: 0x1763906D, 392401005
'       The hash code for "abcdeh" is: 0x175C906D, 391942253
'       The hash code for "abcdei" is: 0x175D906D, 392007789
'       The hash code for "Abcdeg" is: 0x1763954D, 392402253
'       The hash code for "Abcdeh" is: 0x175C954D, 391943501
'       The hash code for "Abcdei" is: 0x175D954D, 392009037

설명

동작 GetHashCode 다른 공용 언어 런타임의 버전 간에 변경 될 수 있는 해당 구현에 따라 달라 집니다.The behavior of GetHashCode is dependent on its implementation, which might change from one version of the common language runtime to another. 이 문제가 발생 하는 이유는 성능을 개선 하기 위해 GetHashCode합니다.A reason why this might happen is to improve the performance of GetHashCode.

데스크톱 앱에서는 <UseRandomizedStringHashAlgorithm > 요소 를 사용 하 여 응용 프로그램 도메인 별로 고유한 해시 코드를 생성할 수 있습니다.In desktop apps, you can use the <UseRandomizedStringHashAlgorithm> element to generate unique hash codes on a per application domain basis. 이 충돌을 줄이려면 하 고 삽입 및 해시 테이블을 사용 하는 조회의 전반적인 성능을 향상 시킬 수 있습니다.This can reduce the number of collisions and improve the overall performance of insertions and lookups that use hash tables. 다음 예제에서는 <UseRandomizedStringHashAlgorithm > 요소를 사용 하는 방법을 보여 줍니다.The following example shows how to use the <UseRandomizedStringHashAlgorithm> element. 정의 된 DisplayString private 문자열 상수를 포함 하는 클래스 s, 값인 "는 문자열입니다."It defines a DisplayString class that includes a private string constant, s, whose value is "This is a string." 메서드를 실행하는 애플리케이션 도메인의 이름과 함께 문자열 값 및 해시 코드를 표시하는 ShowStringHashCode 메서드도 포함합니다.It also includes a ShowStringHashCode method that displays the string value and its hash code along with the name of the application domain in which the method is executing.

using System;

public class Example
{
   public static void Main()
   {
      // Show hash code in current domain.
      DisplayString display = new DisplayString();
      display.ShowStringHashCode();
      
      // Create a new app domain and show string hash code.
      AppDomain domain = AppDomain.CreateDomain("NewDomain");
      var display2 = (DisplayString) domain.CreateInstanceAndUnwrap(typeof(Example).Assembly.FullName, 
                                                          "DisplayString");   
      display2.ShowStringHashCode();
   }
}

public class DisplayString : MarshalByRefObject
{
   private String s = "This is a string.";
   
   public override bool Equals(Object obj)
   {
      String s2 = obj as String; 
      if (s2 == null)
         return false;
      else
         return s == s2; 
   }

   public bool Equals(String str)
   {
      return s == str;
   }    
   
   public override int GetHashCode()
   {
      return s.GetHashCode();
   }
   
   public override String ToString() 
   {
      return s;
   }

   public void ShowStringHashCode()
   {
      Console.WriteLine("String '{0}' in domain '{1}': {2:X8}",
                        s, AppDomain.CurrentDomain.FriendlyName, 
                        s.GetHashCode());
   }
}

Module Example
   Public Sub Main()
      ' Show hash code in current domain.
      Dim display As New DisplayString()
      display.ShowStringHashCode()
      
      ' Create a new app domain and show string hash code.
      Dim domain As AppDomain = AppDomain.CreateDomain("NewDomain")
      Dim display2 = CType(domain.CreateInstanceAndUnwrap(GetType(Example).Assembly.FullName, 
                                                          "DisplayString"), DisplayString)   
      display2.ShowStringHashCode()
   End Sub
End Module

Public Class DisplayString : Inherits MarshalByRefObject

   Private s As String = "This is a string."
   
   Public Overrides Function Equals(obj As Object) As Boolean
      Dim s2 As String = TryCast(obj, String)
      If s2 Is Nothing Then
         Return False
      Else
         Return s = s2 
      End If
   End Function

   Public Overloads Function Equals(str As String) As Boolean
      Return s = str
   End Function    
   
   Public Overrides Function GetHashCode() As Integer
      Return s.GetHashCode()
   End Function
   
   Public Overrides Function ToString() As String
      Return s
   End Function

   Public Sub ShowStringHashCode()
      Console.WriteLine("String '{0}' in domain '{1}': {2:X8}",
                        s, AppDomain.CurrentDomain.FriendlyName, 
                        s.GetHashCode())
   End Sub
End Class

구성 파일을 제공 하지 않고 예제를 실행 하면 다음과 유사한 출력이 표시 됩니다.When you run the example without supplying a configuration file, it displays output similar to the following. 문자열의 해시 코드는 두 애플리케이션 도메인에서 동일합니다.Note that the hash codes for the string are identical in the two application domains.

String 'This is a string.' in domain 'PerDomain.exe': 941BCEAC  
String 'This is a string.' in domain 'NewDomain': 941BCEAC

하지만 샘플 디렉터리에 다음의 구성을 추가하고 샘플을 실행하는 경우 동일 문자열의 해시 코드는 애플리케이션 도메인에 의해 달라집니다.However, if you add the following configuration file to the example's directory and then run the example, the hash codes for the same string will differ by application domain.

<?xml version ="1.0"?>  
<configuration>  
   <runtime>  
      <UseRandomizedStringHashAlgorithm enabled="1" />  
   </runtime>  
</configuration>

구성 파일에 있는 경우이 예제에서는 다음과 같은 출력이 표시 됩니다.When the configuration file is present, the example displays the following output:

String 'This is a string.' in domain 'PerDomain.exe': 5435776D
String 'This is a string.' in domain 'NewDomain': 75CC8236

해시 코드를 사용 하는 방법에 대 한 자세한 내용은 하며 GetHashCode 메서드를 참조 하세요 Object.GetHashCode합니다.For additional information about the use of hash codes and the GetHashCode method, see Object.GetHashCode.

호출자 참고

반환한 값 GetHashCode() 은 플랫폼에 따라 다릅니다.The value returned by GetHashCode() is platform-dependent. 32 비트 및 64 비트 버전의.NET Framework에서 달라 집니다.It differs on the 32-bit and 64-bit versions of the .NET Framework. .NET Core와.NET Framework의 버전 간에 달라질 수 있습니다 것입니다.It also can differ between versions of the .NET Framework and .NET Core.

추가 정보

• GetHashCode()
• <UseRandomizedStringHashAlgorithm> 요소<UseRandomizedStringHashAlgorithm> Element

제공된 읽기 전용 문자 범위의 해시 코드를 반환합니다.Returns the hash code for the provided read-only character span.

public:
 static int GetHashCode(ReadOnlySpan<char> value);

public static int GetHashCode (ReadOnlySpan<char> value);

static member GetHashCode : ReadOnlySpan<char> -> int

Public Shared Function GetHashCode (value As ReadOnlySpan(Of Char)) As Integer

매개 변수

반환