将 XML 文档合并到空的 XML 节点中? [英] Merge XML documents into empty XML node?

问题描述

编辑:这与链接的帖子不太一样.我遇到的主要问题是将子节点附加到一个空的 XML 节点.当直接选择节点时，它会返回一个 System.String 类型，它没有 AppendChild 方法.解决方法是选择所有子节点，然后根据下面 Dan 的建议按名称过滤.

EDIT: This isn't quite the same as the posted that was linked. The main problem I was running into was appending child nodes to an empty XML node. When selecting the node directly, it would return a System.String type, which doesn't have the AppendChild method. The fix was to select all child nodes and then filter that by name, per Dan's suggestion below.

$emptyNode= $root.ChildNodes | ? { $_.name -eq "customers" }

<小时>

我主要使用 powershell，但在我使用的许多代码下面使用的是 .NET System 对象.我想要做的可能是通过一个例子更好地解释.假设我有三个 XML 文档:

---

I'm mostly using powershell, but underneath a lot of the code I'm working with is using .NET System object. What I'm looking to do is probably better explained through an example. Say I have three XML documents:

<!-- XML File A -->
<customer>
    <name>ACME Co</name>
    <users>
        <user>
            <name>Alex</name>
            <age>20</age>
        </user>
        <user>
            <name>Aaron</name>
            <age>21</age>
        </user>
        <user>
            <name>Allison</name>
            <age>22</age>
        </user>
    </users>
</customer>

和

<!-- XML File B -->
<customer>
    <name>Big Co</name>
    <users>
        <user>
            <name>Bob</name>
            <age>30</age>
        </user>
        <user>
            <name>Barry</name>
            <age>31</age>
        </user>
        <user>
            <name>Bill</name>
            <age>32</age>
        </user>
    </users>
</customer>

和

<!-- XML File C -->
<customer>
    <name>Cool Co</name>
    <users>
        <user>
            <name>Carl</name>
            <age>40</age>
        </user>
        <user>
            <name>Craig</name>
            <age>41</age>
        </user>
        <user>
            <name>Chris</name>
            <age>42</age>
        </user>
    </users>
</customer>

我有一个根"文件，看起来像:

I have a "root" document that looks like:

<?xml version='1.0' encoding='utf-8' ?>
<customers>
</customers>

我想合并根文档下的三个 A、B 和 C 文档，这样我的最终产品将是:

I want to combine the three A, B, and C documents under the root doc so my final product will be:

<?xml version='1.0' encoding='utf-8' ?>
<customers>
    <!-- XML File A -->
    <customer>
        <name>ACME</name>
        <users>
            <user>
                <name>Alex</name>
                <age>20</age>
            </user>
            <user>
                <name>Aaron</name>
                <age>21</age>
            </user>
            <user>
                <name>Allison</name>
                <age>22</age>
            </user>
        </users>
    </customer>

    <!-- XML File B -->
    <customer>
        <name>Big Co</name>
        <users>
            <user>
                <name>Bob</name>
                <age>30</age>
            </user>
            <user>
                <name>Barry</name>
                <age>31</age>
            </user>
            <user>
                <name>Bill</name>
                <age>32</age>
            </user>
        </users>
    </customer>

    <!-- XML File C -->
    <customer>
        <name>Cool Co</name>
        <users>
            <user>
                <name>Carl</name>
                <age>40</age>
            </user>
            <user>
                <name>Craig</name>
                <age>41</age>
            </user>
            <user>
                <name>Chris</name>
                <age>42</age>
            </user>
        </users>
    </customer>
</customers>

我一直在查看 AppendChild 和 ImportNode，但我不断收到各种错误.一件事是，在我的根文档中，单个空节点 customers 被列为 System.String 类型而不是 XmlNode，因此我无法附加任何子节点.请参阅此 Powershell 代码段:

I've been looking at AppendChild and ImportNode but I keep getting various errors. One thing, is that in my root document, the single empty node customers is listed a type of System.String rather than an XmlNode, so I can't append any children. See this Powershell snippet:

$doc = New-Object System.Xml.XmlDocument
$doc.LoadXml("<?xml version='1.0' encoding='utf-8' ?><customers></customers>")
$doc.customers.GetType()

IsPublic IsSerial Name    BaseType
-------- -------- ----    --------
True     True     String  System.Object

不过，这甚至无关紧要，因为如果我尝试导入节点，则会收到错误无法导入文档"类型的节点..

That doesn't even matter that much though, because if I try to import the node, I get an error Cannot import nodes of type 'Document'..

$docA = New-Object System.Xml.XmlDocument
$docA.LoadXml("<customer><name>ACME</name><users><user><name>Alex</name><age>20</age></user><user><name>Aaron</name><age>21</age></user><user><name>Allison</name><age>22</age></user></users></customer>")
$docAImported = $doc.ImportNode($docA, $true)

Exception calling "ImportNode" with "2" argument(s): "Cannot import nodes of type 'Document'."
At line:1 char:32
+ $docAImported = $doc.ImportNode <<<< ($docA, $true)
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

任何帮助将不胜感激.谢谢！

Any help would be greatly appreciated. Thanks!

推荐答案

通过执行以下操作首先获取客户节点:

Get the customer node first by doing the following:

$customersNode = $doc.ChildNodes | ? { $_.name -eq "customers" }

现在您可以使用文档 A、B 和 C 在 $customersNode 上调用 AppendChild.

Now you can call AppendChild on $customersNode with document A, B and C.

然而，导入文档 A、B 和 C，您几乎是正确的.使用 DocumentElement 属性，如下所示:

However to import document A, B and C you almost had it right. Use the DocumentElement property like below:

$docAImported = $doc.ImportNode($docA.DocumentElement, $true)

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