/// <summary>
 /// 初始化EMailHelper
 /// </summary>
 /// <param name="smtpHost">邮件服务器Host</param>
 /// <param name="smtpPort">邮件服务器Port</param>
 /// <param name="useSsl">邮件服务器是否是ssl</param>
 /// <param name="userName">发送邮件的账号友善名称</param>
 /// <param name="userAccount">发送邮件的账号地址</param>
 /// <param name="password">发现邮件所需的账号密码</param>
 public EmailService(string smtpHost,
                     int smtpPort,
                     bool useSsl,
                     string userName,
                     string userAccount,
                     string password)
 {
     EMailHelper.Init(smtpHost, smtpPort, useSsl, userName, userAccount, password);
 }
 /// <summary>
 /// 发送电子邮件,默认发送方为
 /// </summary>
 /// <param name="subject">邮件主题</param>
 /// <param name="content">邮件内容主题</param>
 /// <param name="toAddress">接收方信息</param>
 /// <param name="files">附件(文件路径集合)</param>
 /// <returns></returns>
 public async Task SendEMailAsync(string subject, string content, List <string> toAddress, params string[] files)
 {
     await EMailHelper.SendEMailAsync(subject, content, toAddress, files);
 }