X509Certificate Constructor (String)
Initializes a new instance of the X509Certificate class using the name of a PKCS7 signed file.
Assembly: mscorlib (in mscorlib.dll)
| Exception | Condition |
|---|---|
| CryptographicException |
An error with the certificate occurs. For example:
|
| 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); } }
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FileIOPermission
for permission to read the file described by the fileName parameter. Security action: Demand. Associated enumeration: EnvironmentPermissionAccess.Read
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KeyContainerPermission
for permission to create a key container. Security action: Demand. Associated enumeration: KeyContainerPermissionFlags.Create
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
