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CreateFromCertFile Method

X509Certificate.CreateFromCertFile Method

Creates an X.509v3 certificate from the specified PKCS7 signed file.

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

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

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
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