关于邮件发送类的改进_se7en3_新浪博客

还是之前的Mail.cs

加入内容模板属性，因为要使用html模板

 /// <summary>
        /// 内容模板
        /// </summary>
        private string bodyTemplate;
        public string BodyTemplate
        {
            get { return bodyTemplate; }
            set { bodyTemplate=value;}
        }

单例实现

private static volatile Mail instance;
        private static object syncRoot = new object();
       
        public static Mail Instance
        {
            get
            {
                if (instance==null)
                {
                    lock(syncRoot)
                    {
                        if (instance==null)
                        {
                            instance = new Mail();
                        }
                    }