X500DistinguishedNameFlags Enum


Specifies characteristics of the X.500 distinguished name.

This enumeration has a <a href="https://docs.microsoft.com/en-us/dotnet/api/system.flagsattribute">FlagsAttribute</a> attribute that allows a bitwise combination of its member values.

public enum class X500DistinguishedNameFlags
public enum X500DistinguishedNameFlags
type X500DistinguishedNameFlags = 
Public Enum X500DistinguishedNameFlags


DoNotUsePlusSign 32

The distinguished name does not use the plus sign.

DoNotUseQuotes 64

The distinguished name does not use quotation marks.

ForceUTF8Encoding 16384

Forces the distinguished name to encode specific X.500 keys as UTF-8 strings rather than printable Unicode strings. For more information and the list of X.500 keys affected, see the X500NameFlags enumeration.

None 0

The distinguished name has no special characteristics.

Reversed 1

The distinguished name is reversed.

UseCommas 128

The distinguished name uses commas.

UseNewLines 256

The distinguished name uses the new line character.

UseSemicolons 16

The distinguished name uses semicolons.

UseT61Encoding 8192

The distinguished name uses T61 encoding.

UseUTF8Encoding 4096

The distinguished name uses UTF8 encoding instead of Unicode character encoding.


The following code example shows how to use the X500DistinguishedNameFlags enumeration.

#using <System.dll>
#using <system.security.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Permissions;
using namespace System::IO;
using namespace System::Security::Cryptography::X509Certificates;
int main()
      X509Store ^ store = gcnew X509Store( "MY",StoreLocation::CurrentUser );
      store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) );
      X509Certificate2Collection ^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates);
      X509Certificate2Collection ^ fcollection = dynamic_cast<X509Certificate2Collection^>(collection->Find( X509FindType::FindByTimeValid, DateTime::Now, false ));
      X509Certificate2Collection ^ scollection = X509Certificate2UI::SelectFromCollection(fcollection, "Test Certificate Select","Select a certificate from the following list to get information on that certificate",X509SelectionFlag::MultiSelection);
      Console::WriteLine( "Number of certificates: {0}{1}", scollection->Count, Environment::NewLine );
      System::Collections::IEnumerator^ myEnum = scollection->GetEnumerator();
      while ( myEnum->MoveNext() )
         X509Certificate2 ^ x509 = safe_cast<X509Certificate2 ^>(myEnum->Current);
         X500DistinguishedName ^ dname = gcnew X500DistinguishedName( x509->SubjectName );
         Console::WriteLine( "X500DistinguishedName: {0}{1}", dname->Name, Environment::NewLine );
   catch ( CryptographicException^ ) 
      Console::WriteLine( "Information could not be written out for this certificate." );


using System;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.IO;
using System.Security.Cryptography.X509Certificates;

class X500Sample
    static void Main()
            X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
            X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
            X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);
            X509Certificate2Collection scollection = X509Certificate2UI.SelectFromCollection(fcollection, "Test Certificate Select", "Select a certificate from the following list to get information on that certificate", X509SelectionFlag.MultiSelection);
            Console.WriteLine("Number of certificates: {0}{1}", scollection.Count, Environment.NewLine);
            foreach (X509Certificate2 x509 in scollection)
                X500DistinguishedName dname = new X500DistinguishedName(x509.SubjectName);
                Console.WriteLine("X500DistinguishedName: {0}{1}", dname.Name, Environment.NewLine);
        catch (CryptographicException)
            Console.WriteLine("Information could not be written out for this certificate.");
Imports System.Security.Cryptography
Imports System.Security.Permissions
Imports System.IO
Imports System.Security.Cryptography.X509Certificates

Class X500Sample
   Shared msg As String
   Shared Sub Main()
         Dim store As New X509Store("MY", StoreLocation.CurrentUser)
         store.Open((OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly))
         Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection)
         Dim fcollection As X509Certificate2Collection = CType(collection.Find(X509FindType.FindByTimeValid, DateTime.Now, False), X509Certificate2Collection)
         Dim scollection As X509Certificate2Collection = X509Certificate2UI.SelectFromCollection(fcollection, "Test Certificate Select", "Select a certificate from the following list to get information on that certificate", X509SelectionFlag.MultiSelection)
     msg = "Number of certificates: " & scollection.Count & Environment.NewLine
         Dim x509 As X509Certificate2
         For Each x509 In  scollection
            Dim dname As New X500DistinguishedName(x509.SubjectName)
        msg = "X500DistinguishedName: " & dname.Name & Environment.NewLine
         Next x509
     Catch e As Exception
            msg = "Error: Information could not be written out for this certificate."
      End Try
   End Sub
End Class


This enumeration is used with the X500DistinguishedName class to indicate special characters contained in the distinguished name.

Several values are mutually exclusive in this enumeration; use only one of these values to define the special characteristics of an X.500 distinguished name. For example, specify only one of the UseCommas, UseNewLines , and UseSemicolons values. You would also specify either UseT61Encoding or UseUTF8Encoding.

Applies to