使用的XmlWriter追加xml文件 [英] append xml file using xmlwriter

问题描述

感谢您的早期建议用XMLWriter的，每次它会创建新的XML文件，所以我用xmlDoc中加载XML文件，然后在该文件中追加，这里是我的代码，但它会抛出异常说这个文件已经有了一个DocumentElement节点。

Thanks for the earlier suggestion to use "XMLWriter" ,everytime it creates new xml file so i used xmldoc to load the xml file then append in that file,here is my code but it throws exception saying "This document already has a 'DocumentElement' node."

  //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();
            }

下面是我的样本的test.xml

here is my sample 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>

我试图在XML中追加像下面

Am trying to append in the xml like below

 <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>

在此先感谢

推荐答案

要与XML数据玩，如果你使用的是.NET版本3.5其更好地用户的 的LINQ to XML 。

To play with the XML data if you are using .net version 3.5 its better to user LINQ to XML.

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

或

的操作与XPath和XmlDocument的（C＃）

XML数据<强>或

文章：的如何追加到大型XML文件

我thnik需要追加节点您xmldocuemnt这样

I thnik you need to append node to your xmldocuemnt like this

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

您需要做这样的事情。

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");

的

result'll是这样的：

The result'll be like that:

</USERS>
<User>
<UserName>Buggaya</UserName> 

<Email>[e-mail]</Email> 
</User>
</USERS>

一部开拓创新的帖子：的追加XML文档中

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