C#windows server 2016上的TPL ActionBlock行为与windows 10 home上的不同

我正在使用TPL ActionBlock作为我正在开发的网络爬虫

它在我的开发PC（即windows 10 home）上运行良好，但在我的windows Server数据中心2016上，如果在我调用时引发异常，则运行正常

actionBlock.Completion.Wait();

信息是

One or more errors occurred.

内部的例外是

System.Threading.Tasks.TaskCanceledException: A task was canceled.

令人恼火的是，即使在调试模式下在服务器上运行VisualStudio，我也无法找出异常中的错误是在哪里创建的

下面是我如何使用ActionBlock的

actionBlock = new ActionBlock<URLsToCheckObject>(URLToCheck =>
{
    try
    {
        // get more urls etc here and post below

        actionBlock.Post(new URLsToCheckObject { URLAddress = CleanURL, Host = host });
        if (actionBlock.InputCount == 0) actionBlock.Complete();
    }
    catch (Exception ex)
    {
        try
        {
            Logger.AddToDebugLog("Block 3 catch...", WebsiteToCrawl);
        }
        catch { }
    }

}, new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = 3, CancellationToken = cancellationSource.Token });

actionBlock.Post(new URLsToCheckObject { URLAddress = WebsiteToCrawl.website, Host = host });

try
{
    Logger.AddToDebugLog("Waiting on action block..", WebsiteToCrawl);
    actionBlock.Completion.Wait();
}
catch (Exception ex)
{
    try
    {
        Logger.AddToDebugLog("Block 4 catch..." + ex.Message, WebsiteToCrawl);
    }
    catch { }

    try
    {
        Logger.AddToDebugLog("Block 4 catch..." + ex.InnerException, WebsiteToCrawl);
    }
    catch { }

    try
    {
        Logger.AddToDebugLog("Block 4 catch...", WebsiteToCrawl);
    }
    catch { }
}

---

在不同的操作系统上引发异常？

如果您将一个空的

try/catch

放在一个空的

try/catch

中，它真的是空的吗？我希望您的服务器超时，可能有一些策略阻止您访问某些网页？作为一种最佳实践，应该等待操作块完成，而不要使用Wait（）方法。谢谢，为什么try/catch覆盖了操作块中的所有代码而没有捕获这些错误？

actionBlock.Completion.Wait();