在PowerShell中組裝字符串文件的最佳方法

Question

我有一個哈希/數組結構，我想用它來組裝幾個文本文件。 這是實現此目標的最佳方法嗎？

$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的內容應如下所示：

<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

我將使用單個here字符串：

$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

有很多通往羅馬的方式。 我個人喜歡使用現有的工具。 您可以使用.Net框架，因此可以通過多種方式來實現。 例如 您可以使用XmlDocument嘗試這種方法。

$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>

查看此SO問題以了解使用.Net的替代方法。