Inserting XML nodes and inner nodes to an existing XML document in C#

问题

Currently I have a working C# program that works as follows:

Accept .xls template with values (xls is manually created by user)
Save the values (matching fields) to the database
Convert and write .xls to XML. Please see below sample output:

Existing XML Structure

Now, what I want to do is:

Read the existing xml (the created xml)
Insert another set of nodes and subnodes (ReleaseLine and sub nodes). It must accept multiple ReleaseLine.
Save/create the new xml with appended nodes. Please see below output:

This is what I'm looking for:

My existing C# program is simple but the XML nodes and hierarchy is bloody deep. I just created the C# code using new XElement method and passing values for each nodes. Then I simply use xmlDocument.Save() method to write the xml.

[Existing XML Program][3]

回答1:

To add nodes or append content in existing xml-data I´d use Linq to XML.

 XElement xml = XElement.Load("file.xml");

        xml.Add( new XElement("uberNode",
        new XElement("childNode", content),
        new XElement("anotherChildNode", content)));
        xml.Save("file.xml");

Here are some other related solutions.

Add to specific node (with example):

Following exisiting XML-data:

`<Names>
  <Name>
    <prename>John</prename>
    <lastname>Snow</lastname>
  </Name>
  <Name>
    <prename>Harry</prename>
    <lastname>Harry</lastname>
  </Name>
</Names>`

Now I want to add an "age"-tag before the first "prename"-tag and a "family"-tag after the first "lastname"-tag.

  XElement xml = XElement.Load("file.xml");

            var childrens = xml.DescendantsAndSelf().ToArray();
            var first_prename = childrens[2];
            var first_lastname = childrens[3];
            Console.WriteLine(childrens[0]); //prints out the whole content

            first_prename.AddBeforeSelf(new XElement("age", 22));

        first_lastname.AddAfterSelf(new XElement("family", new XElement("mother", "paula"), new XElement("father", "paul")));

        xml.Save("file.xml");

Outcome:

`<Names>
  <Name>
    <age>22</age>
    <prename>John</prename>
    <lastname>Snow</lastname>
    <family>
      <mother>paula</mother>
      <father>paul</father>
    </family>
  </Name>
  <Name>
    <prename>Harry</prename>
    <lastname>Harry</lastname>
  </Name>
</Names>`

I was facing the problem and Linq gave me the easiest way to accomplish that! There are also other similar way e.g. here. But I tried a bit more and DescendantsAndSelf() made it easier for me to go through.

回答2:

I found an answer to my question, here is the link http://www.xmlplease.com/add-xml-linq Using XPathSelectElement method, I was able to find the right node and appended new block of XElement.

来源：https://stackoverflow.com/questions/34282081/inserting-xml-nodes-and-inner-nodes-to-an-existing-xml-document-in-c-sharp

标签

xml

nodes