如何在PowerShell中将Foreach循环嵌入到Html中

3wabscal 于 2022-11-10 发布在 Shell

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我正尝试在PowerShell ISE中创建一个HTML循环，如下所示：

{foreach $obj in $objects}
   <h1>$obj.Name<h1>
{/foreach}

但它只打印对象列表中的最后一个。你做了什么？

powershell

来源：https://stackoverflow.com/questions/74185512/how-to-embed-a-foreach-loop-in-html-in-powershell

1条答案

按热度按时间

qv7cva1a1#

使用expandable(内插)here-字符串，并通过子表达式运算符$(...)嵌入foreach语句：


# Sample objects.

$objects = [pscustomobject] @{ name = 'foo1' },
           [pscustomobject] @{ name = 'foo2' }

# Use an expandable (double-quoted) here-string to construct the HTML.

# The embedded $(...) subexpressions are *instantly* expanded.

@"
<html>
$(
  $(
    foreach ($obj in $objects) {
      "  <h1>$($obj.Name)<h1>"
    }
  ) -join "`n"
)
</html>
"@

产出：

<html>
  <h1>foo1<h1>
  <h1>foo2<h1>
</html>

如果您希望将上述字符串定义为模板，以便可以重复、按需展开(字符串内插)，则使用逐字here-字符串，并通过$ExecutionContext.InvokeCommand.ExpandString()根据当时的变量值按需展开：


# Use a verbatim (single-quoted) here-string as a *template*:

# Note the @' / @' instead of @" / @"

$template = @'
<html>
$(
  $(
    foreach ($obj in $objects) {
      "  <h1>$($obj.Name)<h1>"
    }
  ) -join "`n"
)
</html>
'@

# Sample objects.

$objects = [pscustomobject] @{ name = 'foo1' },
           [pscustomobject] @{ name = 'foo2' }

# Expand the template now.

$ExecutionContext.InvokeCommand.ExpandString($template)

'---'

# Define different sample objects.

$objects = [pscustomobject] @{ name = 'bar1' },
           [pscustomobject] @{ name = 'bar2' }

# Expand the template again, using the new $objects objects.

$ExecutionContext.InvokeCommand.ExpandString($template)

产出：

<html>
  <h1>foo1<h1>
  <h1>foo2<h1>
</html>
---
<html>
  <h1>bar1<h1>
  <h1>bar2<h1>
</html>

注：

考虑到$ExecutionContext.InvokeCommand.ExpandString()有点晦涩难懂，最好能有一个cmdlet来提供与GitHub issue #11693中建议的相同功能，比如命名为Expand-String或Expand-Template。

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如何在PowerShell中将Foreach循环嵌入到Html中

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