X509Certificate2Collection Class
Represents a collection of X509Certificate2 objects. This class cannot be inherited.
Assembly: System (in System.dll)
When an X509Certificate2 store is opened, the result is represented by an X509Certificate2Collection object. If you are familiar with the unmanaged Cryptographic API constructs, you can think of an X509Certificate2Collection as a memory store of X509Certificate2 objects.
The following code example opens the current user's personal certificate store, selects only valid certificates, allows the user to select a certificate, and then writes certificate and certificate chain information to the console. The output depends on the certificate the user selects.
Imports System Imports System.Security.Cryptography Imports System.Security.Permissions Imports System.IO Imports System.Security.Cryptography.X509Certificates Class CertSelect Shared 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) 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) Console.WriteLine("Number of certificates: {0}{1}", scollection.Count, Environment.NewLine) Dim x509 As X509Certificate2 For Each x509 In scollection Dim rawdata As Byte() = x509.RawData Console.WriteLine("Content Type: {0}{1}", X509Certificate2.GetCertContentType(rawdata), Environment.NewLine) Console.WriteLine("Friendly Name: {0}{1}", x509.FriendlyName, Environment.NewLine) Console.WriteLine("Certificate Verified?: {0}{1}", x509.Verify(), Environment.NewLine) Console.WriteLine("Simple Name: {0}{1}", x509.GetNameInfo(X509NameType.SimpleName, True), Environment.NewLine) Console.WriteLine("Signature Algorithm: {0}{1}", x509.SignatureAlgorithm.FriendlyName, Environment.NewLine) Console.WriteLine("Private Key: {0}{1}", x509.PrivateKey.ToXmlString(False), Environment.NewLine) Console.WriteLine("Public Key: {0}{1}", x509.PublicKey.Key.ToXmlString(False), Environment.NewLine) Console.WriteLine("Certificate Archived?: {0}{1}", x509.Archived, Environment.NewLine) Console.WriteLine("Length of Raw Data: {0}{1}", x509.RawData.Length, Environment.NewLine) X509Certificate2UI.DisplayCertificate(x509) x509.Reset() Next x509 store.Close() Catch cExcept As CryptographicException Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Class
System.Collections.CollectionBase
System.Security.Cryptography.X509Certificates.X509CertificateCollection
System.Security.Cryptography.X509Certificates.X509Certificate2Collection
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.