c# - TPL 数据流和控制台应用程序不会终止应用程序

Question

我有一个应该批量调用并压缩大文件的控制台应用程序，我想使用 DataFlow，除了完成之外一切正常

请考虑以下代码

public static void CompressFiles(string folder)
{
    var bufferBlock = new BufferBlock<FileInfo>();

    bufferBlock.LinkTo(Target(), new DataflowLinkOptions() { PropagateCompletion = true});
        var files = GetFilesFromFolder(folder);

        Parallel.ForEach(files, file =>
        {
            bufferBlock.Post(file);
        });

        Stopwatch sw = new Stopwatch();

        sw.Start();
        Parallel.ForEach(files, file =>
        {
            CreateFileT(file.FullName);
        });

        sw.Stop();

       // Task.WaitAll(bufferBlock.Completion);

        bufferBlock.Completion.Wait();
        string tempoImpiegato =
            $"[Generatore PDZ] : tempo impiegato per la generazione di {files.Length} pdz : {sw.Elapsed}";

        LogManager.GetLogger("normal").Info(tempoImpiegato);
    }

和压缩 ActionBlock 是

private static ActionBlock<FileInfo> Target()
    {
        return new ActionBlock<FileInfo>(file =>
        {
            FileInfo bolFileName = new FileInfo(file.FullName.Replace($"{ApplicationHelper.FileExtensionPdf}", $"{ApplicationHelper.FileExtensionBOL}"));
            FileInfo zipFileName = new FileInfo(file.FullName.Replace($"{ApplicationHelper.FileExtensionPdf}", $"{ApplicationHelper.FileExtensionPdz}"));

            if (!File.Exists(file.FullName) || !File.Exists(bolFileName.FullName))
            {
                string s = $"File {file.FullName} o {bolFileName.FullName} non esistenti o inaccessibili";
                Log.Warning(s);
            }
            else
            {
                try
                {
                    using (ZipOutputStream s = new ZipOutputStream(zipFileName.OpenWrite()))
                    {
                        s.SetLevel(9);

                        ZipEntry entry1 = new ZipEntry(file.Name);
                        ZipEntry entry2 = new ZipEntry(bolFileName.Name);

                        entry1.Size = file.Length;
                        entry2.Size = bolFileName.Length;

                        byte[] buffer = ReadBytesFromFileInfo(file);
                        byte[] bufferBol = ReadBytesFromFileInfo(bolFileName);

                        s.PutNextEntry(entry1);
                        s.Write(buffer,0,buffer.Length);
                        s.PutNextEntry(entry2);
                        s.Write(bufferBol, 0, bufferBol.Length);
                    }
                }
                catch (Exception ex)
                {
                    Log.Error(ex, "");
                }
            }
        });
    }

使用 bufferBlock.Completion.Wait() 会阻止程序，而不会继续...我将 PropagateCompletion 设置为 true 并且 Target() 有效(它生成文件)

Answer 1

您正在等待完成，但您并未发出完成信号。 BufferBlock 正在等待更多项目，它不知道您不会再向其中发送任何项目。

要发出完成信号，您需要在等待完成之前调用 Complete:

block.Complete();
await block.Completion;