c#异步发送邮件的类

首先要定义一个邮件信息的基类，如下所示： 代码如下:/// <summary>/// Base message class used for emails/// </summary>public class Message{#region Constructor/// <summary>/// Constructor/// </summary>public Message(){}#endregion #region Properties/// <summary>/// Whom the message is to/// </summary>public virtual string To {