X509BasicConstraintsExtension 建構函式

參考

定義

命名空間:: System.Security.Cryptography.X509Certificates

組件:: System.Security.Cryptography.X509Certificates.dll

組件:: System.Security.Cryptography.dll

組件:: System.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

初始化 X509BasicConstraintsExtension 類別的新執行個體。

多載

X509BasicConstraintsExtension()	初始化 X509BasicConstraintsExtension 類別的新執行個體。
X509BasicConstraintsExtension(AsnEncodedData, Boolean)	使用 X509BasicConstraintsExtension 物件和識別擴充功能是否重要的值，初始化 AsnEncodedData 類別的新執行個體。
X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean)	初始化 X509BasicConstraintsExtension 類別的新執行個體。參數會指定下列項目：指出憑證是否為憑證授權單位 (CA) 憑證的值、指出憑證是否限制其允許之路徑層級數目的值、憑證路徑中允許的層級數目，以及指出擴充功能是否重要的值。

X509BasicConstraintsExtension()

初始化 X509BasicConstraintsExtension 類別的新執行個體。

public:
 X509BasicConstraintsExtension();

public X509BasicConstraintsExtension ();

Public Sub New ()

範例

下列程式碼範例示範如何開啟使用者的個人憑證存儲，並顯示存放區中每個憑證的相關資訊。這個範例會 X509BasicConstraintsExtension 使用類別來顯示資訊。

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

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::X509Certificates;
int main()
{
   try
   {
      X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser );
      store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) );
      X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates);
      for ( int i = 0; i < collection->Count; i++ )
      {
         System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current);
            Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value );
            if ( extension->Oid->FriendlyName == L"Key Usage" )
            {
               X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension);
               Console::WriteLine( ext->KeyUsages );
            }
            if ( extension->Oid->FriendlyName == L"Basic Constraints" )
            {
               X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension);
               Console::WriteLine( ext->CertificateAuthority );
               Console::WriteLine( ext->HasPathLengthConstraint );
               Console::WriteLine( ext->PathLengthConstraint );
            }
            if ( extension->Oid->FriendlyName == L"Subject Key Identifier" )
            {
               X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension);
               Console::WriteLine( ext->SubjectKeyIdentifier );
            }
            if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" )
            {
               X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension);
               OidCollection^ oids = ext->EnhancedKeyUsages;
               System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator();
               while ( myEnum1->MoveNext() )
               {
                  Oid^ oid = safe_cast<Oid^>(myEnum1->Current);
                  Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value );
               }
            }
         }

      }
      store->Close();
   }
   catch ( CryptographicException^ ) 
   {
      Console::WriteLine( L"Information could not be written out for this certificate." );
   }

}

using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

public class CertSelect
{
    public static void Main()
    {
        try
        {
            X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);

            X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
            for (int i = 0; i < collection.Count; i++)
            {
                foreach (X509Extension extension in collection[i].Extensions)
                {
                    Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")");

                    if (extension.Oid.FriendlyName == "Key Usage")
                    {
                        X509KeyUsageExtension ext = (X509KeyUsageExtension)extension;
                        Console.WriteLine(ext.KeyUsages);
                    }

                    if (extension.Oid.FriendlyName == "Basic Constraints")
                    {
                        X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension;
                        Console.WriteLine(ext.CertificateAuthority);
                        Console.WriteLine(ext.HasPathLengthConstraint);
                        Console.WriteLine(ext.PathLengthConstraint);
                    }

                    if (extension.Oid.FriendlyName == "Subject Key Identifier")
                    {
                        X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension;
                        Console.WriteLine(ext.SubjectKeyIdentifier);
                    }

                    if (extension.Oid.FriendlyName == "Enhanced Key Usage")
                    {
                        X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension;
                        OidCollection oids = ext.EnhancedKeyUsages;
                        foreach (Oid oid in oids)
                        {
                            Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")");
                        }
                    }
                }
            }
            store.Close();
        }
        catch (CryptographicException)
        {
            Console.WriteLine("Information could not be written out for this certificate.");
        }
    }
}

Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates



Module CertSelect

    Sub Main()
        Try
            Dim store As New X509Store("MY", StoreLocation.CurrentUser)
            store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly)

            Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection)
            For i As Integer = 0 To collection.Count - 1
                Dim extension As X509Extension
                For Each extension In collection(i).Extensions
                    Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")")


                    If extension.Oid.FriendlyName = "Key Usage" Then
                        Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension)
                        Console.WriteLine(ext.KeyUsages)
                    End If

                    If extension.Oid.FriendlyName = "Basic Constraints" Then
                        Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension)
                        Console.WriteLine(ext.CertificateAuthority)
                        Console.WriteLine(ext.HasPathLengthConstraint)
                        Console.WriteLine(ext.PathLengthConstraint)
                    End If

                    If extension.Oid.FriendlyName = "Subject Key Identifier" Then
                        Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension)
                        Console.WriteLine(ext.SubjectKeyIdentifier)
                    End If

                    If extension.Oid.FriendlyName = "Enhanced Key Usage" Then
                        Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension)
                        Dim oids As OidCollection = ext.EnhancedKeyUsages
                        Dim oid As Oid
                        For Each oid In oids
                            Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")")
                        Next oid
                    End If
                Next extension
            Next i
            store.Close()
        Catch
            Console.WriteLine("Information could not be written out for this certificate.")
        End Try

    End Sub
End Module

適用於

X509BasicConstraintsExtension(AsnEncodedData, Boolean)

使用 X509BasicConstraintsExtension 物件和識別擴充功能是否重要的值，初始化 AsnEncodedData 類別的新執行個體。

public:
 X509BasicConstraintsExtension(System::Security::Cryptography::AsnEncodedData ^ encodedBasicConstraints, bool critical);

public X509BasicConstraintsExtension (System.Security.Cryptography.AsnEncodedData encodedBasicConstraints, bool critical);

new System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension : System.Security.Cryptography.AsnEncodedData * bool -> System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension

Public Sub New (encodedBasicConstraints As AsnEncodedData, critical As Boolean)

參數

encodedBasicConstraints: AsnEncodedData

用來建立擴充功能的編碼資料。

critical: Boolean

如果是關鍵擴充功能則為 true，否則為 false。

備註

如果建立延伸模組的資訊已經在物件中 AsnEncodedData ，請使用這個建構函式。

適用於

X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean)

初始化 X509BasicConstraintsExtension 類別的新執行個體。參數會指定下列項目：指出憑證是否為憑證授權單位 (CA) 憑證的值、指出憑證是否限制其允許之路徑層級數目的值、憑證路徑中允許的層級數目，以及指出擴充功能是否重要的值。

public:
 X509BasicConstraintsExtension(bool certificateAuthority, bool hasPathLengthConstraint, int pathLengthConstraint, bool critical);

public X509BasicConstraintsExtension (bool certificateAuthority, bool hasPathLengthConstraint, int pathLengthConstraint, bool critical);

new System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension : bool * bool * int * bool -> System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension

Public Sub New (certificateAuthority As Boolean, hasPathLengthConstraint As Boolean, pathLengthConstraint As Integer, critical As Boolean)

參數

certificateAuthority: Boolean

如果憑證為憑證授權單位 (CA) 憑證，則為 true，否則為 false。

hasPathLengthConstraint: Boolean

如果憑證限制它允許的路徑層級數目，則為 true，否則為 false。

pathLengthConstraint: Int32

憑證路徑中允許的層級數目。

critical: Boolean

如果是關鍵擴充功能則為 true，否則為 false。

適用於

X509BasicConstraintsExtension 建構函式

定義

多載

X509BasicConstraintsExtension()

範例

適用於

X509BasicConstraintsExtension(AsnEncodedData, Boolean)

參數

備註

適用於

X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean)

參數

適用於

其他資源