c# - Directory.CreateDirectory 是异步的还是什么？

Question

我有以下代码来为我生成的文件准备一个文件夹:

if (Directory.Exists(outputDir))
{
    Directory.Delete(outputDir, true);
}
Directory.CreateDirectory(outputDir);

当我正常运行它时，恰好每隔一秒它就工作一次，而另一次它抛出一个 DirectoryNotFoundException，在线:

File.WriteAllLines(filePath, CreateRows(TestLineCount, TestSampleCount));

说 找不到路径的一部分 'C:\Dev\Android\Projects...。 filePath 中的最后一个文件夹丢失了，因为我删除了它，但后来我又创建了它，所以它应该一直在那里。当我在 Directory.CreateDirectory(outputDir); 行上放置一个断点时，有一个小的延迟，应用程序每次都能正常工作。如果我引入自动延迟，即:

Directory.CreateDirectory(outputDir);
Thread.Sleep(500);

它也每次都有效。当然所有这些调用都应该阻塞直到完成，所以 outputDir 总是在那里？

Answer 1

我认为它不是异步的，但是当你这样调用它时

Directory.CreateDirectory(outputDir); //App is trying to create directory
//successfully created but depends on OS how fast OS commits the changes

Thread.Sleep(500); //assuming physically creation on Hard and its availability in OS took less then 500ms then this wait works or else we have to wait more

//this delay is actually totally non generic since the time differs OS to OS


 // its just a rough guess that changes will be committed within 500ms

if(!Directory.Exists(outputDir))
  //if still not exists Your OS que is being processed very slow due to 
  //some not known reason! so you have to wait more then 500ms