Detailed code examples for interpreting and writing XML files

This article will cover 3 aspects:
1. Accessing XML files
2. XML Document Object Model
3. XML and DataSet

Here we first introduce two objects for operating XML files: XmlTextReader and XmlTextWriter
The object used to open and read Xml files is the XmlTextReader object. The following example opens a sample file sample.xml

XmlTextReader reader = new XmlTextReader("sample.xml");

in the same path as the program. Then we can automatically facilitate the XML file through its Read method. Example:

while(reader.Read())
{
       //在这里填写对于XML的操作代码
}

Let’s look at a more complicated example.

while(reader.Read())
 2{
 3    switch(reader.NodeType)
 4    {
 5        case XmlNodeType.Element:   //当前节点是一个元素
 6              Console.Write("<" + reader.Name);
 7            while(reader.MoveToNextAttribute()) //按照顺序读取下一个属性
 8              Console.Write(" " + reader.Name + "=&#39;" + reader.Value + "&#39;");
 9            Console.Write(">");
10            break;
11        case XmlNodeType.DocumentType:  //XML文件的类型声明
12              Console.WriteLine(reader.NodeType + "<" + reader.Name + ">" + reader.Value);
13            break;
14        ……
15        }
16    }

Starting from line 3, we judge the type of node based on the NodeType attribute, and perform different processing according to different types of nodes.

The following table lists some commonly used node types.

XmlTextWriter writer = new XmlTextWriter("C:\\sample2.xml",null);

XmlTextWriter writer = new XmlTextWriter(Console.Out);