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X509Certificate Constructor (String)

Updated: January 2010

Initializes a new instance of the X509Certificate class using the name of a PKCS7 signed file.

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

public X509Certificate(
	string fileName
)

Parameters

fileName
Type: System.String

The name of a PKCS7 signed file.

ExceptionCondition
CryptographicException

An error with the certificate occurs. For example:

  • The certificate file does not exist.

  • The certificate is invalid.

  • The certificate's password is incorrect.

ArgumentException

The fileName parameter is null.

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

If you create an X509Certificate certificate by specifying a PKCS7 signed file store for fileName, the X509Certificate is created for the certificate that signed the store rather than for any of the certificates within the store.

The following example loads an X.509 certificate from a file, calls the ToString method, and displays the results to the console.

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


public class X509
{

    public static void Main()
    {

        // The path to the certificate.
        string Certificate = "Certificate.cer";

        // Load the certificate into an X509Certificate object.
        X509Certificate cert = new X509Certificate(Certificate);

        // Get the value.
        string resultsTrue = cert.ToString(true);

        // Display the value to the console.
        Console.WriteLine(resultsTrue);

        // Get the value.
        string resultsFalse = cert.ToString(false);

        // Display the value to the console.
        Console.WriteLine(resultsFalse);

    }

}

  • FileIOPermission 

    for permission to read the file described by the fileName parameter. Associated enumeration: Read Security action: Demand

  • KeyContainerPermission 

    for permission to create a key container. Associated enumeration: Create Security action: Demand

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

Date

History

Reason

January 2010

Added information about the type of the certificate file.

Customer feedback.

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