WindowsIdentity クラス

.NET Framework クラス ライブラリ リファレンス

WindowsIdentity クラス

Windows ユーザーを表します。

名前空間: System.Security.Principal
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class WindowsIdentity
    Implements IIdentity, ISerializable, IDeserializationCallback,
 IDisposable

Visual Basic (使用法)

Dim instance As WindowsIdentity

C#

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public class WindowsIdentity : IIdentity, ISerializable,
 IDeserializationCallback, 
    IDisposable

C++

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class WindowsIdentity : IIdentity,
 ISerializable, IDeserializationCallback, 
    IDisposable

J#

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public class WindowsIdentity implements IIdentity,
 ISerializable, 
    IDeserializationCallback, IDisposable

JScript

SerializableAttribute 
ComVisibleAttribute(true) 
public class WindowsIdentity implements IIdentity,
 ISerializable, 
    IDeserializationCallback, IDisposable

解説

GetCurrent メソッドを呼び出して、現在のユーザーを表す WindowsIdentity オブジェクトを作成します。

使用例

WindowsIdentity クラスのメンバの使用例を次に示します。アンマネージの Win32 LogonUser 関数を呼び出して Windows アカウント トークンを取得し、そのトークンで別のユーザーを偽装する方法を示す例については、WindowsImpersonationContext クラスのトピックを参照してください。

Visual Basic

Imports System
Imports System.Security.Principal
Module Module1

    Sub Main()

        ' Retrieve the Windows account token for the current user.
        Dim logonToken As IntPtr = LogonUser()

        ' Constructor implementations.
        IntPtrConstructor(logonToken)
        IntPtrStringConstructor(logonToken)
        IntPtrStringTypeConstructor(logonToken)
        IntPrtStringTypeBoolConstructor(logonToken)

        ' Property implementations.
        UseProperties(logonToken)

        ' Method implementations.
        GetAnonymousUser()
        ImpersonateIdentity(logonToken)

        ' Align interface and conclude application.
        Console.WriteLine(vbCrLf + "This sample completed "
 + _
            "successfully; press Enter to exit.")
        Console.ReadLine()

    End Sub
    ' Create a WindowsIdentity object for the user represented by the
    ' specified Windows account token.
    Private Sub IntPtrConstructor(ByVal
 logonToken As IntPtr)
        ' Construct a WindowsIdentity object using the input account
 token.
        Dim windowsIdentity As New
 WindowsIdentity(logonToken)

        WriteLine("Created a Windows identity object named "
 + _
            windowsIdentity.Name + ".")
    End Sub

    ' Create a WindowsIdentity object for the user represented by the
    ' specified account token and authentication type.
    Private Sub IntPtrStringConstructor(ByVal
 logonToken As IntPtr)
        ' Construct a WindowsIdentity object using the input account
 token 
        ' and the specified authentication type.
        Dim authenticationType = "WindowsAuthentication"
        Dim windowsIdentity As _
            New WindowsIdentity(logonToken, authenticationType)

        WriteLine("Created a Windows identity object named "
 + _
            windowsIdentity.Name + ".")
    End Sub

    ' Create a WindowsIdentity object for the user represented by the
    ' specified account token, authentication type, and Windows account
    ' type.
    Private Sub IntPtrStringTypeConstructor(ByVal
 logonToken As IntPtr)
        ' Construct a WindowsIdentity object using the input account
 token,
        ' and the specified authentication type and Windows account
 type.
        Dim authenticationType As String
 = "WindowsAuthentication"
        Dim guestAccount As WindowsAccountType
 = WindowsAccountType.Guest
        Dim windowsIdentity As _
            New WindowsIdentity(logonToken, authenticationType,
 guestAccount)

        WriteLine("Created a Windows identity object named "
 + _
            windowsIdentity.Name + ".")
    End Sub

    ' Create a WindowsIdentity object for the user represented by the
    ' specified account token, authentication type, Windows account
 type,
    ' and Boolean authentication flag.
    Private Sub IntPrtStringTypeBoolConstructor(ByVal
 logonToken As IntPtr)
        ' Construct a WindowsIdentity object using the input account
 token,
        ' and the specified authentication type, Windows account type,
 and
        ' authentication flag.
        Dim authenticationType As String
 = "WindowsAuthentication"
        Dim guestAccount As WindowsAccountType
 = WindowsAccountType.Guest
        Dim isAuthenticated As Boolean
 = True
        Dim windowsIdentity As New
 WindowsIdentity( _
            logonToken, authenticationType, guestAccount, isAuthenticated)

        WriteLine("Created a Windows identity object named "
 + _
            windowsIdentity.Name + ".")
    End Sub

    ' Access the properties of a WindowsIdentity object.
    Private Sub UseProperties(ByVal
 logonToken As IntPtr)
        Dim windowsIdentity As New
 WindowsIdentity(logonToken)
        Dim propertyDescription As String
 = "The Windows identity named "

        ' Retrieve the Windows logon name from the Windows identity
 object.
        propertyDescription += windowsIdentity.Name

        ' Verify that the user account is not considered to be an Anonymous
        ' account by the system.
        If Not windowsIdentity.IsAnonymous
 Then
            propertyDescription += " is not an Anonymous account"
        End If

        ' Verify that the user account has been authenticated by Windows.
        If (windowsIdentity.IsAuthenticated) Then
            propertyDescription += ", is authenticated"
        End If

        ' Verify that the user account is considered to be a System
 account by
        ' the system.
        If (windowsIdentity.IsSystem) Then
            propertyDescription += ", is a System account"
        End If

        ' Verify that the user account is considered to be a Guest account
 by
        ' the system.
        If (windowsIdentity.IsGuest) Then
            propertyDescription += ", is a Guest account"
        End If

        Dim authenticationType As String
 = windowsIdentity.AuthenticationType

        ' Append the authenication type to the output message.
        If (Not authenticationType Is
 Nothing) Then
            propertyDescription += (" and uses " +
 authenticationType)
            propertyDescription += (" authentication type.")
        End If

        WriteLine(propertyDescription)

        ' Display the SID for the owner.
        Console.Write("The SID for the owner is : ")
        Dim si As SecurityIdentifier
        si = windowsIdentity.Owner
        Console.WriteLine(si.ToString())
        ' Display the SIDs for the groups the current user belongs to.
        Console.WriteLine("Display the SIDs for the groups the
 current user belongs to.")
        Dim irc As IdentityReferenceCollection
        Dim ir As IdentityReference
        irc = windowsIdentity.Groups
        For Each ir In irc
            Console.WriteLine(ir.Value)
        Next
        Dim token As TokenImpersonationLevel
        token = windowsIdentity.ImpersonationLevel
        Console.WriteLine("The impersonation level for the current
 user is : " + token.ToString())
    End Sub
    ' Retrieve the account token from the current WindowsIdentity object
    ' instead of calling the unmanaged LogonUser method in the advapi32.dll.
    Private Function LogonUser() As
 IntPtr
        Dim accountToken As IntPtr = WindowsIdentity.GetCurrent().Token

        Return accountToken
    End Function

    ' Get the WindowsIdentity object for an Anonymous user.
    Private Sub GetAnonymousUser()
        ' Retrieve a WindowsIdentity object that represents an anonymous
        ' Windows user.
        Dim windowsIdentity As WindowsIdentity
        windowsIdentity = windowsIdentity.GetAnonymous()
    End Sub

    ' Impersonate a Windows identity.
    Private Sub ImpersonateIdentity(ByVal
 logonToken As IntPtr)
        ' Retrieve the Windows identity using the specified token.
        Dim windowsIdentity As New
 WindowsIdentity(logonToken)

        ' Create a WindowsImpersonationContext object by impersonating
 the
        ' Windows identity.
        Dim impersonationContext As WindowsImpersonationContext
        impersonationContext = windowsIdentity.Impersonate()

        WriteLine("Name of the identity after impersonation: "
 + _
            windowsIdentity.GetCurrent().Name + ".")

        ' Stop impersonating the user.
        impersonationContext.Undo()

        ' Check the identity.
        WriteLine("Name of the identity after performing an Undo
 on the " + _
            "impersonation: " + windowsIdentity.GetCurrent().Name
 + ".")
    End Sub
    ' Write out message with carriage return to output textbox.
    Private Sub WriteLine(ByVal
 message As String)
        Console.WriteLine(message + vbCrLf)
    End Sub

End Module

C#

using System;
using System.Security.Principal;

class WindowsIdentityMembers
{
    [STAThread]
    static void Main(string[]
 args)
    {
        // Retrieve the Windows account token for the current user.
        IntPtr logonToken = LogonUser();

        // Constructor implementations.
        IntPtrConstructor(logonToken);
        IntPtrStringConstructor(logonToken);
        IntPtrStringTypeConstructor(logonToken);
        IntPrtStringTypeBoolConstructor(logonToken);

        // Property implementations.
        UseProperties(logonToken);

        // Method implementations.
        GetAnonymousUser();
        ImpersonateIdentity(logonToken);

        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified Windows account token.
    private static void
 IntPtrConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

 
    // Create a WindowsIdentity object for the user represented by the
    // specified account token and authentication type.
    private static void
 IntPtrStringConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token 
        // and the specified authentication type.
        string authenticationType = "WindowsAuthentication";
        WindowsIdentity windowsIdentity =
            new WindowsIdentity(logonToken, authenticationType);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, and Windows account
    // type.
    private static void
 IntPtrStringTypeConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token,
        // and the specified authentication type, and Windows account
 type.
        string authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        WindowsIdentity windowsIdentity =
            new WindowsIdentity(logonToken, authenticationType,
 guestAccount);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, Windows account
 type, and
    // Boolean authentication flag.
    private static void
 IntPrtStringTypeBoolConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token,
        // and the specified authentication type, Windows account type,
 and
        // authentication flag.
        string authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        bool isAuthenticated = true;
        WindowsIdentity windowsIdentity = new WindowsIdentity(
            logonToken, authenticationType, guestAccount, isAuthenticated);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

    // Access the properties of a WindowsIdentity object.
    private static void
 UseProperties(IntPtr logonToken)
    {
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);
        string propertyDescription = "The Windows identity
 named ";

        // Retrieve the Windows logon name from the Windows identity
 object.
        propertyDescription += windowsIdentity.Name;

        // Verify that the user account is not considered to be an Anonymous
        // account by the system.
        if (!windowsIdentity.IsAnonymous)
        {
            propertyDescription += " is not an Anonymous account";
        }

        // Verify that the user account has been authenticated by Windows.
        if (windowsIdentity.IsAuthenticated)
        {
            propertyDescription += ", is authenticated";
        }

        // Verify that the user account is considered to be a System
 account
        // by the system.
        if (windowsIdentity.IsSystem)
        {
            propertyDescription += ", is a System account";
        }

        // Verify that the user account is considered to be a Guest
 account
        // by the system.
        if (windowsIdentity.IsGuest)
        {
            propertyDescription += ", is a Guest account";
        }

        // Retrieve the authentication type for the 
        String authenticationType = windowsIdentity.AuthenticationType;

        // Append the authenication type to the output message.
        if (authenticationType != null)
        {
            propertyDescription += (" and uses " + authenticationType);
            propertyDescription += (" authentication type.");
        }

        Console.WriteLine(propertyDescription);

        // Display the SID for the owner.
        Console.Write("The SID for the owner is : ");
        SecurityIdentifier si = windowsIdentity.Owner;
        Console.WriteLine(si.ToString());
        // Display the SIDs for the groups the current user belongs
 to.
        Console.WriteLine("Display the SIDs for the groups
 the current user belongs to.");
        IdentityReferenceCollection irc = windowsIdentity.Groups;
        foreach (IdentityReference ir in irc)
            Console.WriteLine(ir.Value);
        TokenImpersonationLevel token = windowsIdentity.ImpersonationLevel;
        Console.WriteLine("The impersonation level for the
 current user is : " + token.ToString());
    }

    // Retrieve the account token from the current WindowsIdentity object
    // instead of calling the unmanaged LogonUser method in the advapi32.dll.
    private static IntPtr LogonUser()
    {
        IntPtr accountToken = WindowsIdentity.GetCurrent().Token;
        Console.WriteLine( "Token number is: " + accountToken.ToString());

        return accountToken;
    }

    // Get the WindowsIdentity object for an Anonymous user.
    private static void
 GetAnonymousUser()
    {
        // Retrieve a WindowsIdentity object that represents an anonymous
        // Windows user.
        WindowsIdentity windowsIdentity = WindowsIdentity.GetAnonymous();
    }

    // Impersonate a Windows identity.
    private static void
 ImpersonateIdentity(IntPtr logonToken)
    {
        // Retrieve the Windows identity using the specified token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);

        // Create a WindowsImpersonationContext object by impersonating
 the
        // Windows identity.
        WindowsImpersonationContext impersonationContext =
            windowsIdentity.Impersonate();

        Console.WriteLine("Name of the identity after impersonation: "
            + WindowsIdentity.GetCurrent().Name + ".");
        Console.WriteLine(windowsIdentity.ImpersonationLevel);
        // Stop impersonating the user.
        impersonationContext.Undo();

        // Check the identity name.
        Console.Write("Name of the identity after performing an Undo on the");
        Console.WriteLine(" impersonation: " +
            WindowsIdentity.GetCurrent().Name);
    }
}

C++

using namespace System;
using namespace System::Security::Principal;
void IntPtrConstructor( IntPtr logonToken );
void IntPtrStringConstructor( IntPtr logonToken );
void IntPrtStringTypeBoolConstructor( IntPtr logonToken );
void IntPtrStringTypeConstructor( IntPtr logonToken );
void UseProperties( IntPtr logonToken );
IntPtr LogonUser();
void GetAnonymousUser();
void ImpersonateIdentity( IntPtr logonToken );

[STAThread]
int main()
{
   
   // Retrieve the Windows account token for the current user.
   IntPtr logonToken = LogonUser();
   
   // Constructor implementations.
   IntPtrConstructor( logonToken );
   IntPtrStringConstructor( logonToken );
   IntPtrStringTypeConstructor( logonToken );
   IntPrtStringTypeBoolConstructor( logonToken );
   
   // Property implementations.
   UseProperties( logonToken );
   
   // Method implementations.
   GetAnonymousUser();
   ImpersonateIdentity( logonToken );
   Console::WriteLine( "This sample completed successfully; "
   "press Enter to exit." );
   Console::ReadLine();
}


// Create a WindowsIdentity object for the user represented by the
// specified Windows account token.
void IntPtrConstructor( IntPtr logonToken )
{
   
   // Construct a WindowsIdentity object using the input account token.
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken );
   
   Console::WriteLine( "Created a Windows identity object named {0}.",
 windowsIdentity->Name );
}


// Create a WindowsIdentity object for the user represented by the
// specified account token and authentication type.
void IntPtrStringConstructor( IntPtr logonToken )
{
   
   // Construct a WindowsIdentity object using the input account token
 
   // and the specified authentication type.
   String^ authenticationType = "WindowsAuthentication";
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken,authenticationType
 );
   
   Console::WriteLine( "Created a Windows identity object named {0}.",
 windowsIdentity->Name );
}



// Create a WindowsIdentity object for the user represented by the
// specified account token, authentication type and Windows account
// type.
void IntPtrStringTypeConstructor( IntPtr logonToken )
{
   
   // Construct a WindowsIdentity object using the input account token
,
   // and the specified authentication type and Windows account type.
   String^ authenticationType = "WindowsAuthentication";
   WindowsAccountType guestAccount = WindowsAccountType::Guest;
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken,authenticationType,guestAccount
 );
   
   Console::WriteLine( "Created a Windows identity object named {0}.",
 windowsIdentity->Name );
}


// Create a WindowsIdentity object for the user represented by the
// specified account token, authentication type, Windows account type
 and
// Boolean authentication flag.
void IntPrtStringTypeBoolConstructor( IntPtr logonToken )
{
   
   // Construct a WindowsIdentity object using the input account token
,
   // and the specified authentication type, Windows account type, and
   // authentication flag.
   String^ authenticationType = "WindowsAuthentication";
   WindowsAccountType guestAccount = WindowsAccountType::Guest;
   bool isAuthenticated = true;
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken,authenticationType,guestAccount,isAuthenticated
 );
   
   Console::WriteLine( "Created a Windows identity object named {0}.",
 windowsIdentity->Name );
}


// Access the properties of a WindowsIdentity object.
void UseProperties( IntPtr logonToken )
{
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken );
   String^ propertyDescription = "The windows identity named ";
   
   // Retrieve the Windows logon name from the Windows identity object.
   propertyDescription = String::Concat( propertyDescription, windowsIdentity->Name
 );
   
   // Verify that the user account is not considered to be an Anonymous
   // account by the system.
   if (  !windowsIdentity->IsAnonymous )
   {
      propertyDescription = String::Concat( propertyDescription, ", is not an
 Anonymous account" );
   }

   
   // Verify that the user account has been authenticated by Windows.
   if ( windowsIdentity->IsAuthenticated )
   {
      propertyDescription = String::Concat( propertyDescription, ", is authenticated"
 );
   }

   
   // Verify that the user account is considered to be a System account
   // by the system.
   if ( windowsIdentity->IsSystem )
   {
      propertyDescription = String::Concat( propertyDescription, ", is a System
 account" );
   }

   
   // Verify that the user account is considered to be a Guest account
   // by the system.
   if ( windowsIdentity->IsGuest )
   {
      propertyDescription = String::Concat( propertyDescription, ", is a Guest
 account" );
   }

   
   // Retrieve the authentication type for the 
   String^ authenticationType = windowsIdentity->AuthenticationType;
   
   // Append the authenication type to the output message.
   if ( authenticationType != nullptr )
   {
      propertyDescription = String::Format( "{0} and uses {1} authentication
 type.", propertyDescription, authenticationType );
   }

   Console::WriteLine( propertyDescription );
}


// Retrieve the account token from the current WindowsIdentity object
// instead of calling the unmanaged LogonUser method in the advapi32.dll.
IntPtr LogonUser()
{
   
   IntPtr accountToken = WindowsIdentity::GetCurrent()->Token;
   
   return accountToken;
}


// Get the WindowsIdentity object for an Anonymous user.
void GetAnonymousUser()
{
   
   // Retrieve a WindowsIdentity object that represents an anonymous
   // Windows user.
   WindowsIdentity^ windowsIdentity = WindowsIdentity::GetAnonymous();
   
}


// Impersonate a Windows identity.
void ImpersonateIdentity( IntPtr logonToken )
{
   
   // Retrieve the Windows identity using the specified token.
   WindowsIdentity^ windowsIdentity = gcnew WindowsIdentity( logonToken );
   
   // Create a WindowsImpersonationContext object by impersonating the
   // Windows identity.
   WindowsImpersonationContext^ impersonationContext = windowsIdentity->Impersonate();
   Console::WriteLine( "Name of the identity after impersonation: {0}.",
 WindowsIdentity::GetCurrent()->Name );
   
   // Stop impersonating the user.
   impersonationContext->Undo();
   
   // Check the identity name.
   Console::Write( "Name of the identity after performing an Undo on the"
 );
   Console::WriteLine( " impersonation: {0}", WindowsIdentity::GetCurrent()->Name
 );
}

J#

import System.*;
import System.Security.Principal.*;

class WindowsIdentityMembers
{
    /** @attribute STAThread()
     */
    public static void main(String[]
 args)
    {
        // Retrieve the Windows account token for the current user.
        IntPtr logonToken = LogonUser();
        // Constructor implementations.
        IntPtrConstructor(logonToken);
        IntPtrStringConstructor(logonToken);
        IntPtrStringTypeConstructor(logonToken);
        IntPrtStringTypeBoolConstructor(logonToken);
        // Property implementations.
        UseProperties(logonToken);
        // Method implementations.
        GetAnonymousUser();
        ImpersonateIdentity(logonToken);

        Console.WriteLine("This sample completed successfully; "
            + "press Enter to exit.");
        Console.ReadLine();
    } //main

    // Create a WindowsIdentity object for the user represented by the
    // specified Windows account token.
    private static void
 IntPtrConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);
        Console.WriteLine("Created a Windows identity object named "
            + windowsIdentity.get_Name() + ".");
    } //IntPtrConstructor

    // Create a WindowsIdentity object for the user represented by the
    // specified account token and authentication type.
    private static void
 IntPtrStringConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token 
        // and the specified authentication type.
        String authenticationType = "WindowsAuthentication";
        WindowsIdentity windowsIdentity =
            new WindowsIdentity(logonToken, authenticationType);
        Console.WriteLine("Created a Windows identity object named "
            + windowsIdentity.get_Name() + ".");
    } //IntPtrStringConstructor

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, and Windows account
    // type.
    private static void
 IntPtrStringTypeConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token,
        // and the specified authentication type, and Windows account
 type.
        String authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken
,
            authenticationType, guestAccount);
        Console.WriteLine("Created a Windows identity object named "
            + windowsIdentity.get_Name() + ".");
    } //IntPtrStringTypeConstructor

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, Windows account
 type, and
    // Boolean authentication flag.
    private static void
 IntPrtStringTypeBoolConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account
 token,
        // and the specified authentication type, Windows account type,
 and
        // authentication flag.
        String authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        boolean isAuthenticated = true;
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken
,
            authenticationType, guestAccount, isAuthenticated);
        Console.WriteLine("Created a Windows identity object named "
            + windowsIdentity.get_Name() + ".");
    } //IntPrtStringTypeBoolConstructor

    // Access the properties of a WindowsIdentity object.
    private static void
 UseProperties(IntPtr logonToken)
    {
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);
        String propertyDescription = "The Windows identity named ";
        // Retrieve the Windows logon name from the Windows identity
 object.
        propertyDescription += windowsIdentity.get_Name();
        // Verify that the user account is not considered to be an Anonymous
        // account by the system.
        if (!(windowsIdentity.get_IsAnonymous()))
        {
            propertyDescription += " is not an Anonymous account";
        }
        // Verify that the user account has been authenticated by Windows.
        if (windowsIdentity.get_IsAuthenticated())
        {
            propertyDescription += ", is authenticated";
        }
        // Verify that the user account is considered to be a System
 account
        // by the system.
        if (windowsIdentity.get_IsSystem())
        {
            propertyDescription += ", is a System account";
        }
        // Verify that the user account is considered to be a Guest
 account
        // by the system.
        if (windowsIdentity.get_IsGuest())
        {
            propertyDescription += ", is a Guest account";
        }
        // Retrieve the authentication type for the 
        String authenticationType = windowsIdentity.get_AuthenticationType();
        // Append the authenication type to the output message.
        if (authenticationType != null)
        {
            propertyDescription += " and uses " + authenticationType;
            propertyDescription += " authentication type.";
        }

        Console.WriteLine(propertyDescription);

    } //UseProperties

    // Retrieve the account token from the current WindowsIdentity object
    // instead of calling the unmanaged LogonUser method in the advapi32.dll.
    private static IntPtr LogonUser()
    {
        IntPtr accountToken = WindowsIdentity.GetCurrent().get_Token();
        return accountToken;
    } //LogonUser

    // Get the WindowsIdentity object for an Anonymous user.
    private static void
 GetAnonymousUser()
    {
        // Retrieve a WindowsIdentity object that represents an anonymous
        // Windows user.
        WindowsIdentity windowsIdentity = WindowsIdentity.GetAnonymous();
    } //GetAnonymousUser

    // Impersonate a Windows identity.
    private static void
 ImpersonateIdentity(IntPtr logonToken)
    {
        // Retrieve the Windows identity using the specified token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);
        // Create a WindowsImpersonationContext object by impersonating
 the
        // Windows identity.
        WindowsImpersonationContext impersonationContext
            = windowsIdentity.Impersonate();

        Console.WriteLine("Name of the identity after impersonation: "
            + WindowsIdentity.GetCurrent().get_Name() + ".");
        // Stop impersonating the user.
        impersonationContext.Undo();
        // Check the identity name.
        Console.Write("Name of the identity after performing an Undo on the");
        Console.WriteLine(" impersonation: "
            + WindowsIdentity.GetCurrent().get_Name());
    } //ImpersonateIdentity
} //WindowsIdentityMembers

継承階層

System.Object
  System.Security.Principal.WindowsIdentity

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
WindowsIdentity メンバ
System.Security.Principal 名前空間