通过for循环（XDocument）将一个XML文件插入另一个XML文件

Question

This is something I haven't done before, so I might be doing it wrong to begin with, if I am, please let me know.

I created a root XML file with XDocument with:

public void SaveReceipt(List<ArticleFull> articles)
{
    XDocument receipt = new XDocument(
        new XDeclaration("1.0", "utf-8", null),
        new XElement("FiscalRecipet")
    );
    ...
}

And then with a for loop tried to iterate through the articles List so I can build a receipt XML file.

for (int i = 0; i < articles.Count; i++)
{
    int quantity = 1;
    //This while loop just counts how many items are in a row
    while(!(i + 1 > articles.Count - 1))
    {
        if (articles[i].Id == articles[i + 1].Id)
        {
            quantity++;
            i++;
        }
        else break;
    }
    var enternode = new XElement("FiscalItem",
        new XElement("Name", articles[i].Name.ToString()),
        new XElement("Price", articles[i].Price.ToString()),
        new XElement("Quantity", quantity.ToString()),
        new XElement("TaxGroup", articles[i].TaxGroup)
    );
    //Code missing here...
}

Now, as stated above, I have absolutely no idea how to connect one the receipt variable to the enternode variable.

The end XML file should look something like:

<?xml version="1.0" encoding="UTF-8"?>
<FiscalRecipet>
    <FiscalItem>
        <Name>Coffee</Name>
        <Price>130.0</Price>
        <Quantity>1.0</Quantity>
        <TaxGroup>2</TaxGroup>
    </FiscalItem>
    <FiscalItem>
        <Name>Chocolate</Name>
        <Price>350.0</Price>
        <Quantity>2.0</Quantity>
        <TaxGroup>3</TaxGroup>
    </FiscalItem>
    <!-- etc... -->
</FiscalRecipet>

I tried searching for an answer by googling, but I didn't get very lucky, which is why I'm thinking I might be going in a wrong direction(?)

Answer 1

It sounds like you just need:

receipt.Root.Add(enternode);

In other words, adding the new element to the root element of the document.

There are likely to be rather simpler ways of doing all of this using LINQ, btw. I suspect you want something like:

var articlesById = articles
   .GroupBy(article => article.Id)
   .Select(g => new { Article = g.First(), Count = g.Count() });
XDocument receipt = new XDocument(
    new XDeclaration("1.0", "utf-8", null),
    new XElement("FiscalRecipet",
        articlesById.Select(x => new XElement("FiscalItem",
            new XElement("Name", x.Article.Name),
            new XElement("Price", x.Article.Price),
            new XElement("Quantity", x.Count),
            new XElement("TaxGroup", x.Article.TaxGroup))
    )
);

That replaces your whole code.

Answer 2

Just add the fiscal items as children of your fiscal receipt:

var fiscalReceipt = new XElement("FiscalRecipet");
var receipt = new XDocument(new XDeclaration("1.0", "utf-8", null), fiscalReceipt);

for (int i = 0; i < 5; i++)
{
    var enternode = new XElement("FiscalItem",
        new XElement("Name", "foo"),
        new XElement("Price", i * 100),
        new XElement("Quantity", 1),
        new XElement("TaxGroup", "A"));

    fiscalReceipt.Add(enternode);
}

Console.WriteLine(receipt);

---

<FiscalRecipet>
  <FiscalItem>
    <Name>foo</Name>
    <Price>0</Price>
    <Quantity>1</Quantity>
    <TaxGroup>A</TaxGroup>
  </FiscalItem>
  <FiscalItem>
    <Name>foo</Name>
    <Price>100</Price>
    <Quantity>1</Quantity>
    <TaxGroup>A</TaxGroup>
  </FiscalItem>
  <FiscalItem>
    <Name>foo</Name>
    <Price>200</Price>
    <Quantity>1</Quantity>
    <TaxGroup>A</TaxGroup>
  </FiscalItem>
  <FiscalItem>
    <Name>foo</Name>
    <Price>300</Price>
    <Quantity>1</Quantity>
    <TaxGroup>A</TaxGroup>
  </FiscalItem>
  <FiscalItem>
    <Name>foo</Name>
    <Price>400</Price>
    <Quantity>1</Quantity>
    <TaxGroup>A</TaxGroup>
  </FiscalItem>
</FiscalRecipet>
Press any key to continue . . .

Answer 3

Considering that FiscalReceipt is the root, and FiscalItem is your element in it, what you can do is try method

root.Add(childElement);

This will add every FiscalItem as a child of FiscalReceipt.

MSDN link on same : https://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.add%28v=vs.110%29.aspx