/// <summary>
/// 当能被引用时则产生一个包含引用信息的消息构造器
/// </summary>
/// <param name="chain">被引用的消息链</param>
/// <returns>包含引用信息的消息构造器</returns>
public static MessageChainBuilder MakeReply(this MessageChain chain)
{
var builder = new MessageChainBuilder();
builder.AddQuote(((Source)chain.First(x => x is Source)).MessageId);
return(builder);
}
