在PowerShell中汇编字符串文件的最佳方法

Question

我有一个散列/数组结构，我想用它来组合几个文本文件。这是实现这一目标的最好方法吗？

$resolutions = @(
    @{"bitrate" = 1100; "width" = 1920; "height" = 1080};
    @{"bitrate" = 800; "width" = 800; "height" = 448};
    @{"bitrate" = 400; "width" = 800; "height" = 448};
    @{"bitrate" = 128; "width" = 800; "height" = 448};
    @{"bitrate" = 64; "width" = 800; "height" = 448}
)

$metadata =
@"
<xml>
    <targets>`r`n
"@

foreach ($resolution in $resolutions)
{
    $metadata += "        <target>`r`n"
    $metadata += "            <bitrate>$($resolution["bitrate"])</bitrate>`r`n"
    $metadata += "            <width>$($resolution["width"])</width>`r`n"
    $metadata += "            <height>$($resolution["height"])</height>`r`n"
    $metadata += "        </target>`r`n"
}

$metadata +=
@"
    </targets>
</xml>
"@

$metadata | out-file Metadata.xml -encoding ASCII

Metadata.xml的内容应该如下所示：

<xml>
    <targets>
        <target>
            <bitrate>1100</bitrate>
            <width>1920</width>
            <height>1080</height>
        </target>
        <target>
            <bitrate>800</bitrate>
            <width>800</width>
            <height>448</height>
        </target>
        <target>
            <bitrate>400</bitrate>
            <width>800</width>
            <height>448</height>
        </target>
        <target>
            <bitrate>128</bitrate>
            <width>800</width>
            <height>448</height>
        </target>
        <target>
            <bitrate>64</bitrate>
            <width>800</width>
            <height>448</height>
        </target>
    </targets>
</xml>

Answer 1

我会使用一个单独的here-string：

$metadata = @"
<xml>
    <targets>
$(
    foreach ($resolution in $resolutions)
    {
        "<target>"
            "<bitrate>$($resolution.bitrate)</bitrate>"
            "<width>$($resolution.width)</width>"
            "<height>$($resolution.height)</height>"
        "</target>"
    }
)
    </targets>
</xml>
"@

$metadata | out-file Metadata.xml -encoding ASCII

Answer 2

去罗马的路有很多种。就我个人而言，我喜欢使用现有的工具。您已经获得了可用的.Net框架，因此您可以通过多种方式来完成此任务。例如。您可以使用XmlDocument尝试这种方法。

$resolutions = @(
    @{"bitrate" = 1100; "width" = 1920; "height" = 1080};
    @{"bitrate" = 800; "width" = 800; "height" = 448};
    @{"bitrate" = 400; "width" = 800; "height" = 448};
    @{"bitrate" = 128; "width" = 800; "height" = 448};
    @{"bitrate" = 64; "width" = 800; "height" = 448}
)

#Create XMLdoc
$doc = New-Object xml
#Create XML root node "xml"
$xml = $doc.AppendChild($doc.CreateElement("xml"))
#Create collectionnode for targets
$targets = $xml.AppendChild($doc.CreateElement("targets"))

#Create target-node for each resolution
foreach ($res in $resolutions) {
    $target = $doc.CreateElement("target")
    $target.AppendChild($doc.CreateElement("bitrate")).InnerText = $res["bitrate"]
    $target.AppendChild($doc.CreateElement("width")).InnerText = $res["width"]
    $target.AppendChild($doc.CreateElement("height")).InnerText = $res["height"]
    $targets.AppendChild($target) | out-null
}

$doc.Save("C:\Users\graimer\Desktop\test.xml")

test.xml

<xml>
  <targets>
    <target>
      <bitrate>1100</bitrate>
      <width>1920</width>
      <height>1080</height>
    </target>
    <target>
      <bitrate>800</bitrate>
      <width>800</width>
      <height>448</height>
    </target>
    <target>
      <bitrate>400</bitrate>
      <width>800</width>
      <height>448</height>
    </target>
    <target>
      <bitrate>128</bitrate>
      <width>800</width>
      <height>448</height>
    </target>
    <target>
      <bitrate>64</bitrate>
      <width>800</width>
      <height>448</height>
    </target>
  </targets>
</xml>

有关使用.Net的替代方法，请查看this SO question。