如何使用带有ECDSA签名的Bouncy Castle延迟签署证书申请？

I am trying to implement delay signing of a certificate request (CSR) with ECDSA signature algorithm using Bouncy Castle in C#. So far I've managed to implement this with RSA but not ECDSA. I use Pkcs10CertificationRequestDelaySigned class from Bouncy Castle.I am trying to implement delay signing of a cer