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)

public X509Certificate2Collection Find (
	X509FindType findType,
	Object findValue,
	bool 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.

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

class CertSelect
{
	static void Main()
	{
		try
		{
			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)
				{
					byte[] rawdata = 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();
				}
			store.Close();
			}
		catch (CryptographicException)
			{
				   Console.WriteLine("Information could not be written out for this certificate.");
			}
		
	}
}

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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