CreateFromCertFile Method

X509Certificate.CreateFromCertFile Method

Updated: January 2010

Creates an X.509v3 certificate using the name of a PKCS7 signed file.

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

'Declaration
Public Shared Function CreateFromCertFile ( _
	filename As String _
) As X509Certificate
'Usage
Dim filename As String 
Dim returnValue As X509Certificate 

returnValue = X509Certificate.CreateFromCertFile(filename)

Parameters

filename
Type: System.String

The path of the PKCS7 signed file from which to create the X.509 certificate.

Return Value

Type: System.Security.Cryptography.X509Certificates.X509Certificate
The newly created X.509 certificate.

ExceptionCondition
ArgumentException

The filename parameter is Nothing.

ASN.1 DER is the only certificate format supported by this class.

NoteNote:

The certificate file is not restricted to .cerfiles. Any PKCS7 signed file can be used, including an Authenticode signed .pfx file.

The following example creates an X509Certificate from a specified certification file.

Imports System
Imports System.Security.Cryptography.X509Certificates




Public Class X509


   Public Shared Sub Main()

      ' The path to the certificate. 
      Dim Certificate As String = "Certificate.cer" 

      ' Load the certificate into an X509Certificate object. 
      Dim cert As X509Certificate = X509Certificate.CreateFromCertFile(Certificate)

      ' Get the value. 
      Dim resultsTrue As String = cert.ToString(True)

      ' Display the value to the console.
      Console.WriteLine(resultsTrue)

      ' Get the value. 
      Dim resultsFalse As String = cert.ToString(False)

      ' Display the value to the console.
      Console.WriteLine(resultsFalse)
   End Sub   
End Class

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

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Date

History

Reason

January 2010

Added information about the type of the certificate file.

Customer feedback.

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