在C#中修改XML现有内容

发布于 2024-08-27 09:01:14 字数 737 浏览 9 评论 0原文

目的：我计划使用 XmlTextWriter 创建一个 XML 文件，并使用 XmlNode SelectSingleNode()、node.ChildNode[?].InnerText = someting 等修改/更新一些现有内容。

在我使用 XmlTextWriter 创建 XML 文件后，如下所示。

XmlTextWriter textWriter = new XmlTextWriter("D:\\learning\\cs\\myTest.xml", System.Text.Encoding.UTF8);

我练习了下面的代码。但未能保存我的 XML 文件。

XmlDocument doc = new XmlDocument();
doc.Load("D:\\learning\\cs\\myTest.xml");

XmlNode root = doc.DocumentElement;
XmlNode myNode;

myNode= root.SelectSingleNode("descendant::books");

....

textWriter.Close();

doc.Save("D:\\learning\\cs\\myTest.xml");

我发现按照我的方式生产并不好。有什么建议吗？我不清楚同一项目中 XmlTextWriter 和 XmlNode 的概念和用法。感谢您的阅读和回复。

原文

Purpose: I plan to Create a XML file with XmlTextWriter and Modify/Update some Existing Content with XmlNode SelectSingleNode(), node.ChildNode[?].InnerText = someting, etc.

After I created the XML file with XmlTextWriter as below.

XmlTextWriter textWriter = new XmlTextWriter("D:\\learning\\cs\\myTest.xml", System.Text.Encoding.UTF8);

I practiced the code below. But failed to save my XML file.

XmlDocument doc = new XmlDocument();
doc.Load("D:\\learning\\cs\\myTest.xml");

XmlNode root = doc.DocumentElement;
XmlNode myNode;

myNode= root.SelectSingleNode("descendant::books");

....

textWriter.Close();

doc.Save("D:\\learning\\cs\\myTest.xml");

I found it is not good to produce like my way.
Is there any suggestion about it?
I am not clear about the concepts and usage of both XmlTextWriter and XmlNode in the same project.
Thank you for reading and replies.

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葮薆情 2024-09-03 09:01:14

好吧，如果您想更新 XML 中的节点，XmlDocument 就可以了 - 您无需使用 XmlTextWriter。

XmlDocument doc = new XmlDocument();
doc.Load("D:\\build.xml");
XmlNode root = doc.DocumentElement;
XmlNode myNode = root.SelectSingleNode("descendant::books");
myNode.Value = "blabla";
doc.Save("D:\\build.xml");

Well, If you want to update a node in XML, the XmlDocument is fine - you needn't use XmlTextWriter.

XmlDocument doc = new XmlDocument();
doc.Load("D:\\build.xml");
XmlNode root = doc.DocumentElement;
XmlNode myNode = root.SelectSingleNode("descendant::books");
myNode.Value = "blabla";
doc.Save("D:\\build.xml");

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青巷忧颜 2024-09-03 09:01:14

如果您使用的是 Framework 3.5，请使用 LINQ to xml

using System.Xml.Linq;

XDocument xmlFile = XDocument.Load("books.xml"); 
var query = from c in xmlFile.Elements("catalog").Elements("book")    
            select c; 
foreach (XElement book in query) 
{
    book.Attribute("attr1").Value = "MyNewValue";
}
xmlFile.Save("books.xml");

Using LINQ to xml if you are using framework 3.5

using System.Xml.Linq;

XDocument xmlFile = XDocument.Load("books.xml"); 
var query = from c in xmlFile.Elements("catalog").Elements("book")    
            select c; 
foreach (XElement book in query) 
{
    book.Attribute("attr1").Value = "MyNewValue";
}
xmlFile.Save("books.xml");

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吲‖鸣 2024-09-03 09:01:14

形成 XML 文件

XmlTextWriter xmlw = new XmlTextWriter(@"C:\WINDOWS\Temp\exm.xml",System.Text.Encoding.UTF8);
xmlw.WriteStartDocument();            
xmlw.WriteStartElement("examtimes");
xmlw.WriteStartElement("Starttime");
xmlw.WriteString(DateTime.Now.AddHours(0).ToString());
xmlw.WriteEndElement();
xmlw.WriteStartElement("Changetime");
xmlw.WriteString(DateTime.Now.AddHours(0).ToString());
xmlw.WriteEndElement();
xmlw.WriteStartElement("Endtime");
xmlw.WriteString(DateTime.Now.AddHours(1).ToString());
xmlw.WriteEndElement();
xmlw.WriteEndElement();
xmlw.WriteEndDocument();  
xmlw.Close();

要编辑 Xml 节点，请使用以下代码

XmlDocument doc = new XmlDocument(); 
doc.Load(@"C:\WINDOWS\Temp\exm.xml"); 
XmlNode root = doc.DocumentElement["Starttime"]; 
root.FirstChild.InnerText = "First"; 
XmlNode root1 = doc.DocumentElement["Changetime"]; 
root1.FirstChild.InnerText = "Second"; 
doc.Save(@"C:\WINDOWS\Temp\exm.xml");

尝试此操作。这是 C# 代码。

Forming a XML file

XmlTextWriter xmlw = new XmlTextWriter(@"C:\WINDOWS\Temp\exm.xml",System.Text.Encoding.UTF8);
xmlw.WriteStartDocument();            
xmlw.WriteStartElement("examtimes");
xmlw.WriteStartElement("Starttime");
xmlw.WriteString(DateTime.Now.AddHours(0).ToString());
xmlw.WriteEndElement();
xmlw.WriteStartElement("Changetime");
xmlw.WriteString(DateTime.Now.AddHours(0).ToString());
xmlw.WriteEndElement();
xmlw.WriteStartElement("Endtime");
xmlw.WriteString(DateTime.Now.AddHours(1).ToString());
xmlw.WriteEndElement();
xmlw.WriteEndElement();
xmlw.WriteEndDocument();  
xmlw.Close();

To edit the Xml nodes use the below code

XmlDocument doc = new XmlDocument(); 
doc.Load(@"C:\WINDOWS\Temp\exm.xml"); 
XmlNode root = doc.DocumentElement["Starttime"]; 
root.FirstChild.InnerText = "First"; 
XmlNode root1 = doc.DocumentElement["Changetime"]; 
root1.FirstChild.InnerText = "Second"; 
doc.Save(@"C:\WINDOWS\Temp\exm.xml");

Try this. It's C# code.

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