在PowerShell中写入控制台的最佳方式

I am having a little confusion about the various ways to print (echo) to the console. I have seen that there are multiple ways to write output to the console, such as:

我对打印（回显）到控制台的各种方法有点困惑。我已经看到有多种方法可以将输出写入控制台，例如：

Write-Host "Hello world1"
"Hello World2"
Out-Host -InputObject "Hello World3"

All three ways will print to the console. The middle one is somehow simpler and less verbose and easier to use. I also find that when you write a function such as:

这三种方式都将打印到控制台。中间的一个更简单，更简洁，更容易使用。我还发现当你编写一个函数时，例如：

function GetValues()
{
    "1"
    "2"
}

It still returns two strings in the pipeline:

它仍然在管道中返回两个字符串：

And I'm still able to print out the values:

我仍然可以打印出值：

foreach ($s in GetValues)
{
    Write-Host "s: " $s
}

The thing that I have found was that using just the quoted string doesn't always appear on custom hosts, and that I have had to use Write-Host to get values to print on custom hosts.

我发现的事情是，仅使用引用的字符串并不总是出现在自定义主机上，而且我必须使用Write-Host来获取要在自定义主机上打印的值。

Somehow I find this confusing. Is "Print something" supposed to be an alias to Write-Host or what is the intent?

不知怎的，我发现这令人困惑。 “打印东西”应该是Write-Host的别名还是意图是什么？

2 个解决方案

#1

Default behaviour of PowerShell is just to dump everything that falls out of a pipeline without being picked up by another pipeline element or being assigned to a variable (or redirected) into Out-Host. What Out-Host does is obviously host-dependent.

PowerShell的默认行为只是转储掉管道外的所有内容，而不会被另一个管道元素拾取或分配给变量（或重定向）到Out-Host。 Out-Host的功能显然取决于主机。

Just letting things fall out of the pipeline is not a substitute for Write-Host which exists for the sole reason of outputting text in the host application.

只是让事情脱离管道并不能代替Write-Host，它只是在主机应用程序中输出文本的唯一原因。

If you want output, then use the Write-* cmdlets. If you want return values from a function, then just dump the objects there without any cmdlet.

如果需要输出，请使用Write- * cmdlet。如果要从函数返回值，则只需将对象转储到那里而不使用任何cmdlet。

#2

The middle one writes to the pipeline. Write-Host and Out-Host writes to the console. 'echo' is an alias for Write-Output which writes to the pipeline as well. The best way to write to the console would be using the Write-Host cmdlet.

中间的一个写入管道。 Write-Host和Out-Host写入控制台。 'echo'是Write-Output的别名，它也写入管道。写入控制台的最佳方法是使用Write-Host cmdlet。

When an object is written to the pipeline it can be consumed by other commands in the chain. For example:

当一个对象被写入管道时，它可以被链中的其他命令使用。例如：

"hello world" | Do-Something

but this won't work since Write-Host writes to the console, not to the pipeline (Do-Something will not get the string):

但这不起作用，因为Write-Host写入控制台，而不是管道（Do-Something不会得到字符串）：

Write-Host "hello world" | Do-Something

#1