public Message(string title, string content, Contact sender, Contact recipient)
{
if (string.IsNullOrEmpty(title))
{
throw new ArgumentException("title can't be null");
}
if (title.Length > 20)
{
throw new ArgumentException("标题长度不能超过20");
}
if (string.IsNullOrEmpty(content))
{
throw new ArgumentException("content can't be null");
}
if (content.Length > 400)
{
throw new ArgumentException("内容长度不能超过400");
}
if (sender == null)
{
throw new ArgumentException("sender can't be null");
}
if (recipient == null)
{
throw new ArgumentException("recipient can't be null");
}
this.ID = Guid.NewGuid().ToString();
this.Title = title;
this.Content = content;
this.SendTime = DateTime.Now;
this.State = MessageState.Unread;
this.DisplayType = MessageDisplayType.OutboxAndInbox;
this.Sender = sender;
this.Recipient = recipient;
}
public void SetState(Contact reader)
{
if (this.Recipient.Name.Equals(reader.Name) && this.State == MessageState.Unread)
{
this.State = MessageState.Read;
}
}
public bool SetDisplayType(Contact reader)
{
// to do...
switch (this.DisplayType)
{
case MessageDisplayType.OutboxAndInbox:
if (this.Sender.Name.Equals(reader.Name))
{
this.DisplayType = MessageDisplayType.Inbox;
}
else
{
this.DisplayType = MessageDisplayType.Outbox;
}
return true;
case MessageDisplayType.Outbox:
break;
case MessageDisplayType.Inbox:
break;
default:
break;
}
return false;
}