代码如下：

注意：先要添加引用System.ServiceProcess

class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine(ServiceIsExisted("MSSQLSERVER"));

        }

        public static bool ServiceIsExisted(string serviceName)

        {

            ServiceController[] services = ServiceController.GetServices();

            foreach (ServiceController s in services)

            {

                if (s.ServiceName == serviceName)

                {

                    return true;

                }

            }

            return false;

        }  

    }