/// <inheritdoc />
        public async Task Run()
        {
            if (!ExclusiveRegionGuard.TryEnter(ref _exclusiveGuard))
            {
                return;
            }

            try
            {
                await RunExclusive();
            }
            finally
            {
                ExclusiveRegionGuard.Leave(ref _exclusiveGuard);
            }
        }
 /// <summary>
 /// 初始化 <see cref="ExclusiveCrawlerTaskBase"/> 类的新实例。
 /// </summary>
 protected ExclusiveCrawlerTaskBase()
 {
     ExclusiveRegionGuard.InitializeGuard(out _exclusiveGuard);
 }