MqttConnectionOptionsCertificateFile 属性

获取或设置是否使用CA证书的方式来通信，当为空的时候，默认不使用证书，不为空则使用证书，需要传入证书的完整路径信息
Obtain or set whether to use the certificate authority to communicate, when empty, the default is not to use the certificate, not empty to use the certificate, you need to pass in the full path information of the certificate

public string CertificateFile { get; set; }

Public Property CertificateFile As String
	Get
	Set

public:
property String^ CertificateFile {
	String^ get ();
	void set (String^ value);
}

member CertificateFile : string with get, set