抑制 Test-NetConnection 的信息 [英] Suppress information of Test-NetConnection

问题描述

如何抑制来自 Test-NetConnection -ComputerName localhost 的 PowerShell 会话的详细信息?

How can I supress the detailed information from Test-NetConnection -ComputerName localhost for a PowerShell session?

Test-NetConnection 将相当多的信息写入显示在控制台顶部的控制台，覆盖进度条.

Test-NetConnection writes quite a bit of information to the console which is displayed in the top of the console, overwriting the progress bar.

可以通过将 -InformationLevel 设置为 Quiet 来抑制输出看起来可以像使用 -InformationLevel 参数一样抑制输出，但事实证明，即使使用 -InformationLevel 到 Quiet 中的信息显示控制台顶部.

The output can be suppressed by setting the -InformationLevel to Quiet like so It looked like the output could be supressed like with the -InformationLevel parameter, however it turns out that even with -InformationLevel to Quiet the information in the top of the console is shown.

Test-NetConnection -ComputerName localhost -InformationLevel Quiet

我想为整个脚本设置一次 InformationLevel，就像你会 在使用 Invoke-WebRequest 时抑制进度条.

I would like to set the InformationLevel just once for the whole script, like you would suppress the progress bar when using Invoke-WebRequest.

$progressPreference = 'silentlyContinue'    # Subsequent calls do not display UI.
Invoke-WebRequest ...
$progressPreference = 'Continue'            # Subsequent calls do display UI.

据我所知，没有类似的 $InformationLevelPreference Test-NetConnection 会监听.

To my knowledge there is no similar $InformationLevelPreference Test-NetConnection will listen to.

推荐答案

Ansgar 提议的解决方案的替代方案是使用 $PSDefaultParameterValues 自动变量:

An alternative to Ansgar's proposed solution would be to use the $PSDefaultParameterValues automatic variable:

PS C:\> Test-NetConnection localhost

ComputerName           : localhost
RemoteAddress          : ::1
InterfaceAlias         : Loopback Pseudo-Interface 1
SourceAddress          : ::1
PingSucceeded          : True
PingReplyDetails (RTT) : 0 ms

PS C:\> $PSDefaultParameterValues['Test-NetConnection:InformationLevel'] = 'Quiet'
PS C:\> Test-NetConnection localhost
True

$PSDefaultParameterValues 字典中的条目具有CommandName:ParameterName 形式的键，然后值是您要默认提供的参数参数值.如有必要，您可以将通配符合并为 CommandName 部分的一部分

Entries in $PSDefaultParameterValues dictionary have keys in the form of CommandName:ParameterName, and then the value is the parameter argument value you want to supply by default. You can incorporate wildcards as part of the CommandName part if necessary

您可能在切换到 -InformationLevel:Quiet 时看到进度条消失的原因是，向环回接口发出单个 ICMP 请求并返回单个布尔值发生得如此之快，以至于宿主应用程序永远没有机会实际获取进度流状态更改并在返回提示之前显示进度叠加.

The reason that you might have seen the progress bar go away when switching to -InformationLevel:Quiet is that issuing a single ICMP request to a loopback interface and returning a single boolean value happens so fast that the host application never has a chance to actually pick up the progress stream state change and display the progress overlay before returning to the prompt.

如果你想在执行过程中抑制顶部的进度条(不管命令运行多长时间)，使用 $ProgressPreference 变量:

If you want to suppress the progress bar at the top during execution (regardless of how long the command is running), use the $ProgressPreference variable:

PS C:\> $ProgressPreference = 'SilentlyContinue'
PS C:\> Test-NetConnection localhost

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