C# 如何使用 XmlReader 类？
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How to use XmlReader class?
提问by mohammad reza
I want to save and load my xml data using XmlReader. But I don't know how to use this class. Can you give me a sample code for start?
我想使用 XmlReader 保存和加载我的 xml 数据。但我不知道如何使用这个类。你能给我一个开始的示例代码吗？
采纳答案by benjamin
Personally I have switched away from XMLReader to System.XML.Linq.XDocument to manage my XML data files. This way I can easily pull data from xml into objects and manage them like any other object in my program. When I am done manipulating them I can just save the changes back out the the xml file at any time.
我个人已经从 XMLReader 切换到 System.XML.Linq.XDocument 来管理我的 XML 数据文件。通过这种方式，我可以轻松地将数据从 xml 提取到对象中，并像程序中的任何其他对象一样管理它们。当我完成对它们的操作后，我可以随时将更改保存回 xml 文件。
//Load my xml document
XDocument myData = XDocument.Load(PhysicalApplicationPath + "/Data.xml");
//Create my new object
HelpItem newitem = new HelpItem();
newitem.Answer = answer;
newitem.Question = question;
newitem.Category = category;
//Find the Parent Node and then add the new item to it.
XElement helpItems = myData.Descendants("HelpItems").First();
helpItems.Add(newitem.XmlHelpItem());
//then save it back out to the file system
myData.Save(PhysicalApplicationPath + "/Data.xml");
If I want to use this data in an easily managed data set I can bind it to a list of my objects.
如果我想在一个易于管理的数据集中使用这些数据，我可以将它绑定到我的对象列表。
List<HelpItem> helpitems = (from helpitem in myData.Descendants("HelpItem")
select new HelpItem
{
Category = helpitem.Element("Category").Value,
Question = helpitem.Element("Question").Value,
Answer = helpitem.Element("Answer").Value,
}).ToList<HelpItem>();
Now it can be passed around and manipulated with any inherent functions of my object class.
现在它可以通过我的对象类的任何固有函数来传递和操作。
For convenience my class has a function to create itself as an xml node.
为方便起见，我的班级有一个将自身创建为 xml 节点的功能。
public XElement XmlHelpItem()
{
XElement helpitem = new XElement("HelpItem");
XElement category = new XElement("Category", Category);
XElement question = new XElement("Question", Question);
XElement answer = new XElement("Answer", Answer);
helpitem.Add(category);
helpitem.Add(question);
helpitem.Add(answer);
return helpitem;
}
回答by Mehrdad Afshari
You should use the Createmethod instead of using new, since XmlReaderis an abstract classusing the Factory pattern.
您应该使用Create方法而不是使用new，因为XmlReader它是abstract class使用工厂模式。
var xmlReader = XmlReader.Create("xmlfile.xml");
回答by jason
From the excellent C# 3.0 in a Nutshell, consider looking at the sample codefrom chapter 11.
从优秀的C# 3.0 in a Nutshell 中，考虑查看第 11 章中的示例代码。
回答by Matt Brindley
MSDN has a simple example to get you started here.
MSDN 有一个简单的示例可以帮助您从这里开始。
If you're interested in reading and writing XML documents, and not just specifically using the XmlReader class, there's a nice article covering a few of your options here.
如果您对阅读和编写 XML 文档感兴趣，而不仅仅是专门使用 XmlReader 类，这里有一篇很好的文章，介绍了您的一些选项。
But if you just want to get started and play around, try this:
但如果你只是想开始玩，试试这个：
XmlReaderSettings settings = new XmlReaderSettings();
settings.IgnoreWhitespace = true;
settings.IgnoreComments = true;
XmlReader reader = XmlReader.Create("file.xml", settings);
