Question

我正在使用XmlDocument和XmlWriter将XML附加到现有文件中，但我在下面的尝试是抛出一个我不理解的异常

此文档已有“DocumentElement”节点。

//Append to xml file

XmlDocument doc = new XmlDocument();
doc.Load(@"c:\\test.xml");
using (XmlWriter xmlWrite = doc.CreateNavigator().AppendChild())
{
    xmlWrite.WriteStartElement("image name=",Name);
    xmlWrite.WriteElementString("width", widthValue[1]);
    xmlWrite.WriteElementString("Height", heightValue[1]);
    xmlWrite.WriteElementString("file-size", FileSizeValue[1]);
    xmlWrite.WriteElementString("file-format", FileFormatValue[1]);
    xmlWrite.WriteElementString("resolution", ResolutionValue[1]);
    xmlWrite.Close();
}

这是我的示例test.xml

<job-metadata>
    <slug>730s_Sales/CupWinner_0111</slug>
    <locations>Africa</locations>
    <primary-location>Africa</primary-location>
    <reporter>Leigh Sales</reporter>
    <genre>Current</genre>
    <copyright>CBS</copyright>
    <autopublish>true</autopublish> 
</job-metadata>

我试图像下面的xml一样追加

<job-metadata>
    <slug>730s_Sales/CupWinner_0111</slug>
    <locations>Africa</locations>
    <primary-location>Africa</primary-location>
    <reporter>Leigh Sales</reporter>
    <genre>Current</genre>
    <copyright>CBS</copyright>
    <autopublish>true</autopublish> 
    <image name="557684_20111101-730s_SalesCupWinner_0111_80x60.jpg">
        <width>80</width>
        <height>60</height>
        <file-size>7045</file-size>
        <file-format>JPEG Baseline</file-format>
        <resolution>72</resolution>
        <custom-name>newsthumbnail</custom-name>
    </image>
</job-metadata>

Answer 1

如果您使用的是.net版本3.5，那么要使用XML数据，最好是用户LINQ to XML。

http://www.codeproject.com/Articles/24376/LINQ-to-XML

或

Manipulate XML data with XPath and XmlDocument (C#)

或

文章：How to Append to a Large XML File

我需要将节点附加到xmldocuemnt，就像这样

//add to elements collection doc.DocumentElement.AppendChild(node);

你需要做这样的事情

XmlDocument xmlDoc=new XmlDocument(); xmlDoc.Load("F:/Documents and Settings/Administrator/Desktop/Account.xml"); XmlElement subRoot=xmlDoc.CreateElement("User"); //UserName XmlElement appendedElementUsername=xmlDoc.CreateElement("UserName"); XmlText xmlTextUserName=xmlDoc.CreateTextNode(txtUsrName.Text.Trim()); appendedElementUsername.AppendChild(xmlTextUserName); subRoot.AppendChild(appendedElementUsername); xmlDoc.DocumentElement.AppendChild(subRoot); //Email XmlElement appendedElementEmail=xmlDoc.CreateElement("Email"); XmlText xmlTextEmail=xmlDoc.CreateTextNode(txtEmail.Text.Trim()); appendedElementEmail.AppendChild(xmlTextEmail); subRoot.AppendChild(appendedElementEmail); xmlDoc.DocumentElement.AppendChild(subRoot); xmlDoc.Save("F:/Documents and Settings/Administrator/Desktop/Account.xml");if(!File.Exists("F:/Documents and Settings/Administrator/Desktop/Account.xml")) { XmlTextWriter textWritter=new XmlTextWriter("F:/Documents and Settings/Administrator/Desktop/Account.xml", null); textWritter.WriteStartDocument(); textWritter.WriteStartElement("USERS"); textWritter.WriteEndElement(); textWritter.Close(); } XmlDocument xmlDoc=new XmlDocument(); xmlDoc.Load("F:/Documents and Settings/Administrator/Desktop/Account.xml"); XmlElement subRoot=xmlDoc.CreateElement("User"); //UserName XmlElement appendedElementUsername=xmlDoc.CreateElement("UserName"); XmlText xmlTextUserName=xmlDoc.CreateTextNode(txtUsrName.Text.Trim()); appendedElementUsername.AppendChild(xmlTextUserName); subRoot.AppendChild(appendedElementUsername); xmlDoc.DocumentElement.AppendChild(subRoot); //Email XmlElement appendedElementEmail=xmlDoc.CreateElement("Email"); XmlText xmlTextEmail=xmlDoc.CreateTextNode(txtEmail.Text.Trim()); appendedElementEmail.AppendChild(xmlTextEmail); subRoot.AppendChild(appendedElementEmail); xmlDoc.DocumentElement.AppendChild(subRoot); xmlDoc.Save("F:/Documents and Settings/Administrator/Desktop/Account.xml");

结果就是这样：

</USERS> <User> <UserName>Buggaya</UserName> <Email>Buggaya@gmail.com</Email> </User> </USERS>

orignal post：Append in xml document

使用XmlWriter附加到XML文件

1 个答案: