分享一个Fluent风格的邮件发送封装类

C#中用SmtpClient发邮件很简单，闲着无事，简单封装一下

IEmailFactory

public interface IEmailFactory
    {
        IEmailFactory SetHost(string host);
        IEmailFactory SetPort(int port);
        IEmailFactory SetUserName(string userName);
        IEmailFactory SetPassword(string password);
        IEmailFactory SetSSL(bool enableSsl);
        IEmailFactory SetTimeout(int timeout);
        IEmailFactory SetFromAddress(string address);
        IEmailFactory SetFromDisplayName(string displayName);
        IEmailFactory LoadFromConfigFile(); //从Config文件中加载配置
        IEmailFactory SetSubject(string subject);
        IEmailFactory SetBody(string body);
        /// <summary>
        /// 添加收件人地址（执行多次即添加多个地址）
        /// </summary>
        IEmailFactory SetToAddress(params string[] addresses);
        /// <summary>
        /// 添加抄送人地址（执行多次即添加多个地址）
        /// </summary>
        IEmailFactory SetCcAddress(params string[] addresses);
        /// <summary>
        /// 添加附件（执行多次即添加多个附件）
        /// </summary>
        IEmailFactory SetAttachment(params Attachment[] attachments);

        void Send();
        Task SendAsync();
    }

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