Powershell中的线程如何工作?

问题描述

我想在Powershell中将某些文件解析操作与网络活动并行化.快速谷歌，启动线程看起来像一个解决方案，但是:

I want to parallelize some file-parsing actions with network activity in powershell. Quick google for it, start-thread looked like a solution, but:

当我尝试开始工作时，发生了同样的事情.

The same thing happened when I tried start-job.

我还尝试摆弄 System.Threading.Thread

[System.Reflection.Assembly]::LoadWithPartialName("System.Threading")
#This next errors, something about the arguments I can't figure out from the documentation of .NET
$tstart = new-object System.Threading.ThreadStart({DoSomething}) 
$thread = new-object System.Threading.Thread($tstart) 
$thread.Start()

所以，我认为最好的办法是使用启动线程时知道我做错了什么，因为它似乎对其他人有用.我使用v2.0，不需要向下兼容.

So, I think the best would be to know what I do wrong when I use start-thread, because it seems to work for other people. I use v2.0 and I don't need downward compatibility.

推荐答案

Powershell没有名为Start-Thread的内置命令.

Powershell does not have a built-in command named Start-Thread.

V2.0确实具有PowerShell作业，这些作业可以在后台运行，并且可以被视为等同于线程.您可以使用以下命令来处理作业:

V2.0 does, however, have PowerShell jobs, which can run in the background, and can be considered the equivalent of a thread. You have the following commands at your disposal for working with jobs:

Name                              Category  Synopsis
----                              --------  --------
Start-Job                         Cmdlet    Starts a Windows PowerShell background job.
Get-Job                           Cmdlet    Gets Windows PowerShell background jobs that are running in the current ...
Receive-Job                       Cmdlet    Gets the results of the Windows PowerShell background jobs in the curren...
Stop-Job                          Cmdlet    Stops a Windows PowerShell background job.
Wait-Job                          Cmdlet    Suppresses the command prompt until one or all of the Windows PowerShell...
Remove-Job                        Cmdlet    Deletes a Windows PowerShell background job.

以下是有关如何使用它的示例.要开始工作，请使用start-job并传递一个脚本块，其中包含要异步运行的代码:

Here is an example on how to work with it. To start a job, use start-job and pass a script block which contains the code you want run asynchronously:

$job  = start-job { get-childitem . -recurse }

此命令将启动一个作业，该作业将递归地将所有子级递归到当前目录下，并且您将立即返回命令行.

This command will start a job, that gets all children under the current directory recursively, and you will be returned to the command line immediately.

您可以检查$job变量以查看作业是否完成，等等.如果要等待作业完成，请使用:

You can examine the $job variable to see if the job has finished, etc. If you want to wait for a job to finish, use:

wait-job $job

最后，要接收工作的结果，请使用:

Finally, to receive the results from a job, use:

receive-job $job

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