XML DOM的问题，用XML文档编写 [英] Problem with XML DOM, writing in XML document

问题描述

嗨！

我在写入XML文件时遇到问题。当我运行我的程序时，c＃给了我一个例外：要插入的节点来自不同的文档上下文。我看了一下异常，我找到了答案，当我们从一个文档写到另一个文档时，就会发生这种情况。但我不会从一个写到另一个，但我从对象写入xml文件。这是程序向我显示异常的代码：

Hi!
I have a problem with writing to an XML file. When i run my program, the c# give me an exception: "The node to be inserted is from a different document context.". I looked a bit on the exception and I found the answers , that this is happening when we write from one document to another. But i dont write from one to another, but I write from the object to xml file. This is the code where the program shows me exception:

private XmlDocument novDokument = new XmlDocument();

public void zapisiArtikleKiSoNaZalogiVnewDoc(string vhodna, string izhodna)
{
    int i = 1;

    newDoc.AppendChild(newDoc.CreateXmlDeclaration(new Version(1, 0).ToString(), Encoding.UTF8.BodyName, string.Empty));
    XmlElement novSeznamArtikel = newDoc.CreateElement("seznamArtiklov");

    foreach (Artikel a in seznamPrebranihArtiklov)
    {
        if (Convert.ToInt16(a.zalogaA) > 0)
        {
            XmlElement novArtikel = newDoc.CreateElement("artikel");
            novArtikel.SetAttribute("id", i.ToString());

            XmlElement novNaziv = newDoc.CreateElement("naziv");
            novNaziv.InnerText = a.nazivA;
            novArtikel.AppendChild(novNaziv);

            XmlElement novaCena = newDoc.CreateElement("cena");
            novaCena.InnerText = a.cenaA;
            novArtikel.AppendChild(novaCena);


            XmlElement novDatum = newDoc.CreateElement("datum");
            novArtikel.AppendChild(novDatum);

            XmlElement novNabave = doc.CreateElement("nabave");
            novNabave.InnerText = a.datumNabaveA;
            novDatum.AppendChild(novNabave); //HERE RAISES AN EXCEPTION

            novSeznamArtikel.AppendChild(novArtikel);
            i++;
        }
    }

    newDoc.AppendChild(novSeznamArtikel);

    XmlTextWriter tw = new XmlTextWriter(izhodna, null);
    tw.Formatting = Formatting.Indented;
    newDoc.WriteContentTo(tw);

    tw.Close();
}

XML文档应如下所示：

And XML document should look like this:

<?xml version="1.0" encoding="utf-8" ?>
<seznamArtiklov>
  <artikel id="1">
    <naziv>Kruh</naziv>
    <cena>3</cena>
    <datum>
      <nabave>03.09.2012</nabave>
    </datum>
  </artikel>
</seznamArtiklov

如果有人知道我的问题的解决方案是非常受欢迎的。要提前回答谢谢！

If anyone knows the solution to my problem is very welcome. To answer thank you in advance!

推荐答案

尝试更改：

Hi,

Try changing this:

XmlElement novDatum = newDoc.CreateElement("datum");
novArtikel.AppendChild(novDatum);

XmlElement novNabave = doc.CreateElement("nabave");
novNabave.InnerText = a.datumNabaveA;
novDatum.AppendChild(novNabave); //HERE RAISES AN EXCEPTION

到此：

into this:

XmlElement novDatum = newDoc.CreateElement("datum");

XmlElement novNabave = doc.CreateElement("nabave");
novNabave.InnerText = a.datumNabaveA;
novDatum.AppendChild(newDoc.ImportNode(novNabave, true)); // first import the node into the document, and then append novNabave to novDatum before you append novDatum to novArtikel

novArtikel.AppendChild(novDatum);

希望这会有所帮助。

Hope this helps.

i已尝试，但效果相同。同一行上的异常信号：

Hi,
i have tried, but the same effect. Exception signals on the same line:

novDatum.AppendChild(novNabave);

感谢您的回复。

Thanks for the reply.

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