X509Certificate2Collection.Find Method

Searches an X509Certificate2Collection object using the search criteria specified by the X509FindType enumeration and the findValue object.

Namespace: System.Security.Cryptography.X509Certificates
Assembly: System (in system.dll)

'Declaration
Public Function Find ( _
	findType As X509FindType, _
	findValue As Object, _
	validOnly As Boolean _
) As X509Certificate2Collection
'Usage
Dim instance As X509Certificate2Collection
Dim findType As X509FindType
Dim findValue As Object
Dim validOnly As Boolean
Dim returnValue As X509Certificate2Collection

returnValue = instance.Find(findType, findValue, validOnly)
public X509Certificate2Collection Find (
	X509FindType findType, 
	Object findValue, 
	boolean validOnly
)
public function Find (
	findType : X509FindType, 
	findValue : Object, 
	validOnly : boolean
) : X509Certificate2Collection
Not applicable.

Parameters

findType

One of the X509FindType values.

findValue

The search criteria as an object.

validOnly

true to allow only valid certificates to be returned from the search; otherwise, false.

Return Value

An X509Certificate2Collection object.

Exception typeCondition

CryptographicException

findType is invalid.

Use this method to find X509Certificate2 objects if no user interaction is needed. Use the Find method to allow the user to select X509Certificate2 objects.

Note that this method can be used in a cascading or nested style, narrowing the search criteria with each call to the method.

The following code example opens the current user's personal certificate store, finds 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

import System.*;
import System.Security.Cryptography.*;
import System.Security.Permissions.*;
import System.IO.*;
import System.Security.Cryptography.X509Certificates.*;

public class CertSelect
{
	/** @attribute SecurityPermission(SecurityAction.LinkDemand,
		Unrestricted = true) */
    public static void main(String[] args)
    {
        try {
            X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);

            X509Certificate2Collection collection =
                (X509Certificate2Collection)store.get_Certificates();
            X509Certificate2Collection fCollection =
                (X509Certificate2Collection)collection.Find(
                X509FindType.FindByTimeValid, DateTime.get_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}",
                (Int32)sCollection.get_Count(), Environment.get_NewLine());
            for (int iCtr = 0; iCtr < sCollection.get_Count(); iCtr++) {
                X509Certificate2 x509 =
                    (X509Certificate2)(sCollection.get_Item(iCtr));
                ubyte rawData[] = x509.get_RawData();

                Console.WriteLine("Content Type: {0}{1}",
                    X509Certificate2.GetCertContentType(rawData),
                    Environment.get_NewLine());
                Console.WriteLine("Friendly Name: {0}{1}",
                    x509.get_FriendlyName(), Environment.get_NewLine());
                Console.WriteLine("Certificate Verified?: {0}{1}",
                    (System.Boolean)x509.Verify(), Environment.get_NewLine());
                Console.WriteLine("Simple Name: {0}{1}",
                    x509.GetNameInfo(X509NameType.SimpleName, true),
                    Environment.get_NewLine());
                Console.WriteLine("Signature Algorithm: {0}{1}",
                    x509.get_SignatureAlgorithm().get_FriendlyName(),
                    Environment.get_NewLine());
                Console.WriteLine("Private Key: {0}{1}",
                    x509.get_PrivateKey().ToXmlString(false),
                    Environment.get_NewLine());
                Console.WriteLine("Public Key: {0}{1}",
                    x509.get_PublicKey().get_Key().ToXmlString(false),
                    Environment.get_NewLine());
                Console.WriteLine("Certificate Archived?: {0}{1}",
                    (System.Boolean)x509.get_Archived(),
                    Environment.get_NewLine());
                Console.WriteLine("Length of Raw Data: {0}{1}",
                    (Int32)x509.get_RawData().length,
                    Environment.get_NewLine());
                X509Certificate2UI.DisplayCertificate(x509);
                x509.Reset();
            }
            store.Close();
        }
        catch (CryptographicException exp) {
            Console.WriteLine("Information could not be written out for this "
                + "certificate.");
        }
    } //main
} //CertSelect

Windows 98, Windows Server 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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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