在签署数据时使用USB密钥令牌获取异常C＃

Question

以下是签署数据的代码。当我从Visual Studio运行时，它完美地工作并签名，但是当我将它发布到IIS时，它无法与证书匹配，并且在mycert中没有分配任何证书。最终它抛出异常无法找到原始签名者。我的开发和发布机器是一样的。我已经安装了IIS并将代码托管在同一台机器上，但没有运气。

public static string Sign(string signData)
        {
 try
            {

X509Certificate2 mycert = null;

                X509Store my = new X509Store(StoreName.My, StoreLocation.CurrentUser);
                my.Open(OpenFlags.ReadOnly);

                foreach (X509Certificate2 cert in my.Certificates)
                {
                    mycert = cert;
                    if (cert.Subject.ToUpper().Contains("MYNAME"))
                    {   // it never goes into this match when host in IIS
                        WriteToLogFile("*** Debugging mode at certificate match ***");
                        mycert = cert;
                        break;
                    }
                }

                string Base64Payload = Convert.ToBase64String(Encoding.UTF8.GetBytes(signData));

                string sha256 = SHA256Checksum(signData);
                byte[] data = Encoding.UTF8.GetBytes(sha256);

                ContentInfo content = new ContentInfo(data);
                SignedCms signedCms = new SignedCms(content);
                CmsSigner signer = new CmsSigner(mycert);
                signer.DigestAlgorithm = new Oid("SHA256");

                //signer.IncludeOption = X509IncludeOption.WholeChain;
                signer.IncludeOption = X509IncludeOption.EndCertOnly;

                // create the signature
                signedCms.ComputeSignature(signer, false);    // Get Exception on this line Cannot find the original signer.



                bool isValid = Verify(signedCms.Encode(), mycert);              
                return Convert.ToBase64String(signedCms.Encode());

}
            catch (Exception ex)
            {
                WriteToLogFile("*** Exception while making signed data ***"+ex.Message);
                throw ex;
            }
        }