您需要使用HttpClientHandler类并使用必要的客户端证书对其进行配置。
将.crt和.key文件加载到X509Certificate2对象中：

using System.Security.Cryptography.X509Certificates;

var certPath = "path/to/certificate.crt";
var keyPath = "path/to/privatekey.key";
var cert = new X509Certificate2(certPath);
cert.PrivateKey = LoadPrivateKey(keyPath); // Implement the method to load the private key from the .key file

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然后创建一个HttpClientHandler并设置客户端证书：

var handler = new HttpClientHandler();
handler.ClientCertificates.Add(cert);

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现在创建HttpClient并使用HttpClientHandler：

using (var httpClient = new HttpClient(handler))
{
    // Use the httpClient to send requests
}

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