Certificates Property
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X509Store.Certificates Property


Returns a collection of certificates located in an X.509 certificate store.

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

public X509Certificate2Collection Certificates { get; }

Property Value

Type: System.Security.Cryptography.X509Certificates.X509Certificate2Collection

A collection of certificates.

This method returns a snapshot of the X.509 certificate store. Note that subsequent Add or Remove operations performed on the store will not have any effect on the collection that is returned. This snapshot is recalculated each time the property is called, so the use of this property inside an iterative function is not recommended.

This section contains two examples. The first example demonstrates how you can open standard X.509 stores and list the number of certificates in each.

The second example demonstrates how you can add and remove single certificates and ranges of certificates.

Example 1

This example tries to open each standard store in each standard location on the current computer. It prints a summary that shows whether each store exists and, if so, the number of certificates it contains.

The example creates an X509Store object for each combination of standard name and standard location. It calls the Open method with the OpenFlags.OpenExistingOnly flag, which opens the physical store only if it already exists. If the physical store exists, the example uses the Name, Location, and Certificates properties to display the number of certificates in the store.

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

public class Example
    static void Main()
        Console.WriteLine("\r\nExists Certs Name and Location");
        Console.WriteLine("------ ----- -------------------------");

        foreach (StoreLocation storeLocation in (StoreLocation[]) 
            foreach (StoreName storeName in (StoreName[]) 
                X509Store store = new X509Store(storeName, storeLocation);


                    Console.WriteLine("Yes    {0,4}  {1}, {2}", 
                        store.Certificates.Count, store.Name, store.Location);
                catch (CryptographicException)
                    Console.WriteLine("No           {0}, {1}", 
                        store.Name, store.Location);

/* This example produces output similar to the following:

Exists Certs Name and Location
------ ----- -------------------------
Yes       1  AddressBook, CurrentUser
Yes      25  AuthRoot, CurrentUser
Yes     136  CA, CurrentUser
Yes      55  Disallowed, CurrentUser
Yes      20  My, CurrentUser
Yes      36  Root, CurrentUser
Yes       0  TrustedPeople, CurrentUser
Yes       1  TrustedPublisher, CurrentUser

No           AddressBook, LocalMachine
Yes      25  AuthRoot, LocalMachine
Yes     131  CA, LocalMachine
Yes      55  Disallowed, LocalMachine
Yes       3  My, LocalMachine
Yes      36  Root, LocalMachine
Yes       0  TrustedPeople, LocalMachine
Yes       1  TrustedPublisher, LocalMachine


Example 2

This example opens an X.509 certificate store, adds and deletes certificates, and then closes the store. It assumes that you have three certificates to add to and remove from a local store.

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

public class X509store2
	public static void Main (string[] args)
		//Create new X509 store called teststore from the local certificate store.
		X509Store store = new X509Store ("teststore", StoreLocation.CurrentUser);
		store.Open (OpenFlags.ReadWrite);
		X509Certificate2 certificate = new X509Certificate2 ();

		//Create certificates from certificate files.
		//You must put in a valid path to three certificates in the following constructors.
		X509Certificate2 certificate1 = new X509Certificate2 ("c:\\mycerts\\*****.cer");
		X509Certificate2 certificate2 = new X509Certificate2 ("c:\\mycerts\\*****.cer");
		X509Certificate2 certificate5 = new X509Certificate2 ("c:\\mycerts\\*****.cer");

		//Create a collection and add two of the certificates.
		X509Certificate2Collection collection = new X509Certificate2Collection ();
		collection.Add (certificate2);
		collection.Add (certificate5);

		//Add certificates to the store.
		store.Add (certificate1);
		store.AddRange (collection);

		X509Certificate2Collection storecollection = (X509Certificate2Collection)store.Certificates;
		Console.WriteLine ("Store name: {0}", store.Name);
		Console.WriteLine ("Store location: {0}", store.Location);
		foreach (X509Certificate2 x509 in storecollection)
			Console.WriteLine("certificate name: {0}",x509.Subject);

		//Remove a certificate.
		store.Remove (certificate1);
		X509Certificate2Collection storecollection2 = (X509Certificate2Collection)store.Certificates;
		Console.WriteLine ("{1}Store name: {0}", store.Name, Environment.NewLine);
		foreach (X509Certificate2 x509 in storecollection2)
			Console.WriteLine ("certificate name: {0}", x509.Subject);

		//Remove a range of certificates.
		store.RemoveRange (collection);
		X509Certificate2Collection storecollection3 = (X509Certificate2Collection)store.Certificates;
		Console.WriteLine ("{1}Store name: {0}", store.Name, Environment.NewLine);
		if (storecollection3.Count == 0)
			Console.WriteLine ("Store contains no certificates.");
			foreach (X509Certificate2 x509 in storecollection3)
				Console.WriteLine ("certificate name: {0}", x509.Subject);

		//Close the store.
		store.Close ();


for enumerating certificates in an X.509 certificate store. Security action: Demand. Associated enumeration: StorePermissionFlags.EnumerateCertificates

Universal Windows Platform
Available since 10
.NET Framework
Available since 2.0
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