Retrieves the first certificate that matches the specified thumbprint.
| Name | Type | Description |
|---|---|---|
thumbprint |
string |
The thumbprint of the certificate to find. The thumbprint is the SHA-1 hash of the certificate.
This string can be in the following formats:
|
validOnly |
bool |
true to search only for valid certificates (certificates that are not expired and have not been revoked); otherwise, false.
If this parameter is
true, only certificates that are valid at the time of the search are returned.
|
An X509Certificate2 object that represents the certificate that matches the specified thumbprint, or null if no matching certificate is found.
| Type | Condition |
|---|---|
| ArgumentException | The thumbprint parameter is not a valid thumbprint format. |
| CryptographicException | An error occurred during cryptographic processing. |
The thumbprint is the SHA-1 hash of the certificate. It is a unique identifier for the certificate.
This method searches the certificate store for a certificate that matches the specified thumbprint.
If validOnly is set to true, the method will only return certificates that are currently valid.
The following code example demonstrates how to use the FindByThumbprint method to retrieve an X509Certificate2 object.
using System;
using System.Security.Cryptography.X509Certificates;
public class Example
{
public static void Main()
{
// Replace with a valid thumbprint from your system
string thumbprintToFind = "0000000000000000000000000000000000000000";
// Find the certificate using its thumbprint, only valid ones
X509Certificate2 certificate = X509Certificate2.FindByThumbprint(thumbprintToFind, true);
if (certificate != null)
{
// Certificate found, you can now use it
Console.WriteLine("Certificate found:");
Console.WriteLine("Subject: {0}", certificate.Subject);
Console.WriteLine("Issuer: {0}", certificate.Issuer);
Console.WriteLine("Thumbprint: {0}", certificate.Thumbprint);
}
else
{
Console.WriteLine("Certificate not found or is not valid.");
}
}
}