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C# https private key [ X509Certificate2.PrivateKey Property ]     資料來源: https://msdn.microsoft.com/en-us/library/system.security.cryptography.x509certificates.x509certificate2.privatekey(v=vs.110).aspx   using System; using System.Security.Cryptography; using System.Security.Permissions; using System.IO; using System.Security.Cryptography.X509Certificates; class CertSelect {     static void Main()     {         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)         {             try             {                 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();             }             catch (CryptographicException)             {                 Console.WriteLine(“Information could not be written out for this certificate.”);             }         }         store.Close();     } }