在开始睡眠(或直到脚本结束)之后，对象输出的怪异延迟 [英] weird delay of the output of an object when followed by start-sleep (or until script end)

问题描述

由于某种原因，在完成睡眠命令之前，对象不会输出.

For some reason, the object won't output until the sleep command is done.

[pscustomobject]@{message = 'hi'}; sleep 5

这是另一个例子.循环结束之前，您将看不到输出.

Here's another example. You won't see the output until the loop finishes.

foreach ($i in 1..60) { 
  if ($i -eq 1) { [pscustomobject]@{message = $i} } 
  sleep 1
}

我想您必须至少输出2个对象才能看到任何内容? ¯\ _(ツ)_/¯15秒后，您将看到两个对象.

I guess you have to output at least 2 objects to see anything? ¯\_(ツ)_/¯ After 15 seconds, you see both objects.

foreach ($i in 1..60) {
  if ($i -eq 1 -or $i -eq 15) { [pscustomobject]@{message = $i} }
  sleep 1
}

或输出足够的属性(> 4)以隐式调用format-list而不是format-table. 格式表是问题.这马上就出现了.

Or output enough properties (> 4) to implicitly call format-list instead of format-table. Format-table is the problem. This comes out right away.

[pscustomobject]@{a=1; b=2; c=3; d=4; e=5}; sleep 10

我想知道是否可以像-NoWait这样添加格式表参数.

I wonder if a parameter to format-table could be added like -NoWait.

具有包含列宽的格式文件的已知对象类型没有此问题.

Known object types with format files containing column widths don't have this problem.

foreach ($i in 1..60) { 
  if ($i -eq 1) { get-process powershell } 
  sleep 1
}

或默认为格式自定义的对象:

Or objects that default to format-custom:

foreach ($i in 1..60) { 
  if ($i -eq 1) { get-date } 
  sleep 1
}

推荐答案

输出少于5个属性，并且格式表隐式运行.在显示第一个对象之前，格式表将在第二个对象中等待不确定的时间.这适用于没有定义 default 表格视图的xml文件的对象类型(例如pscustomobject).

Output less than 5 properties, and format-table implicitly runs. Format-table will wait an indefinite amount of time for the second object, before displaying the first object. This is for object types (like pscustomobject) without an xml file that define a default table view.

# no output for 5 seconds

&{get-date
sleep 5
get-date} | format-table


DisplayHint DateTime                               Date                 Day DayOfWeek DayOfYear Hour  Kind Millisecond Minute
----------- --------                               ----                 --- --------- --------- ----  ---- ----------- ------
   DateTime Saturday, February 8, 2020 10:24:48 AM 2/8/2020 12:00:00 AM   8  Saturday        39   10 Local         618     24
   DateTime Saturday, February 8, 2020 10:24:53 AM 2/8/2020 12:00:00 AM   8  Saturday        39   10 Local         892     24

与format-list比较:

Compare with format-list:

& {get-date
sleep 5
get-date} | format-list 

DisplayHint : DateTime
Date        : 2/8/2020 12:00:00 AM
Day         : 8
DayOfWeek   : Saturday
DayOfYear   : 39
Hour        : 20
Kind        : Local
Millisecond : 408
Minute      : 37
Month       : 2
Second      : 18
Ticks       : 637167910384087860
TimeOfDay   : 20:37:18.4087860
Year        : 2020
DateTime    : Saturday, February 8, 2020 8:37:18 PM

DisplayHint : DateTime
Date        : 2/8/2020 12:00:00 AM
Day         : 8
DayOfWeek   : Saturday
DayOfYear   : 39
Hour        : 20
Kind        : Local
Millisecond : 662
Minute      : 37
Month       : 2
Second      : 23
Ticks       : 637167910436622480
TimeOfDay   : 20:37:23.6622480
Year        : 2020
DateTime    : Saturday, February 8, 2020 8:37:23 PM

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