PowerShell中的等效代码。看来有时私钥刚好消失了。我使用Process Monitor，你可以看到正在删除的密钥文件。

I had the same issue using the equivalent code in PowerShell. It appears that sometime the private key just disappears. I used Process Monitor and you can see the key file being deleted.

我解决这个问题的方法是添加 X509KeyStorageFlags.PersistKeySet 到X509Certificate2构造函数。

The way I solved this was to add X509KeyStorageFlags.PersistKeySet to the X509Certificate2 constructor.