/// <summary>
        /// 获取 <see cref="Messaging.Mention"/> 实例的目标。
        /// </summary>
        /// <param name="mention">要操作的 <see cref="Messaging.Mention"/> 实例。</param>
        /// <param name="context">要使用的 <see cref="PluginContext"/>。</param>
        public static IUser GetTarget(this Mention mention, PluginContext context)
        {
            if (mention is null)
            {
                throw new ArgumentNullException(nameof(mention));
            }

            if (context is null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            return(context.GetUser(mention.TargetNumber));
        }
        /// <summary>
        /// 设置 <see cref="Messaging.Mention"/> 实例的目标。
        /// </summary>
        /// <param name="mention">要操作的 <see cref="Messaging.Mention"/> 实例。</param>
        /// <param name="target"><see cref="Messaging.Mention"/> 实例的目标。</param>
        public static Mention SetTarget(this Mention mention, IUser target)
        {
            if (mention is null)
            {
                throw new ArgumentNullException(nameof(mention));
            }

            if (target is null)
            {
                throw new ArgumentNullException(nameof(target));
            }

            mention.TargetNumber = target.Number;

            return(mention);
        }
 /// <summary>
 /// 使用 <see cref="PluginContext.Current"/> 获取 <see cref="Messaging.Mention"/> 实例的目标。
 /// </summary>
 /// <param name="mention">要操作的 <see cref="Messaging.Mention"/> 实例。</param>
 public static IUser GetTarget(this Mention mention) => GetTarget(mention, PluginContext.Current);