C# 如何使用 XmlDocument 创建 XML 文档？
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How to create an XML document using XmlDocument?
提问by user1480049
how to create an XML document like this?
如何创建这样的 XML 文档？
<body>
<level1>
<level2>text</level2>
<level2>other text</level2>
</level1>
</body>
using XmlDocumentin C#
使用XmlDocument在C＃
回答by Omar
What about:
关于什么：
#region Using Statements
using System;
using System.Xml;
#endregion
class Program {
static void Main( string[ ] args ) {
XmlDocument doc = new XmlDocument( );
//(1) the xml declaration is recommended, but not mandatory
XmlDeclaration xmlDeclaration = doc.CreateXmlDeclaration( "1.0", "UTF-8", null );
XmlElement root = doc.DocumentElement;
doc.InsertBefore( xmlDeclaration, root );
//(2) string.Empty makes cleaner code
XmlElement element1 = doc.CreateElement( string.Empty, "body", string.Empty );
doc.AppendChild( element1 );
XmlElement element2 = doc.CreateElement( string.Empty, "level1", string.Empty );
element1.AppendChild( element2 );
XmlElement element3 = doc.CreateElement( string.Empty, "level2", string.Empty );
XmlText text1 = doc.CreateTextNode( "text" );
element3.AppendChild( text1 );
element2.AppendChild( element3 );
XmlElement element4 = doc.CreateElement( string.Empty, "level2", string.Empty );
XmlText text2 = doc.CreateTextNode( "other text" );
element4.AppendChild( text2 );
element2.AppendChild( element4 );
doc.Save( "D:\document.xml" );
}
}
(1) Does a valid XML file require an xml declaration?
(2) What is the difference between String.Empty and “” (empty string)?
(1)有效的 XML 文件是否需要 xml 声明？
(2) String.Empty 和“”（空字符串）有什么区别？
The result is:
结果是：
<?xml version="1.0" encoding="UTF-8"?>
<body>
<level1>
<level2>text</level2>
<level2>other text</level2>
</level1>
</body>
But I recommend you to use LINQ to XMLwhich is simpler and more readable like here:
但我建议您使用LINQ to XML，它更简单、更易读，如下所示：
#region Using Statements
using System;
using System.Xml.Linq;
#endregion
class Program {
static void Main( string[ ] args ) {
XDocument doc = new XDocument( new XElement( "body",
new XElement( "level1",
new XElement( "level2", "text" ),
new XElement( "level2", "other text" ) ) ) );
doc.Save( "D:\document.xml" );
}
}
回答by Teo
Working with a dictionary ->level2 above comes from a dictionary in my case (just in case anybody will find it useful) Trying the first example I stumbled over this error: "This document already has a 'DocumentElement' node."I was inspired by the answer here
使用字典 -> 上面的 level2 来自我的字典（以防万一有人会发现它有用）尝试第一个示例时，我偶然发现了这个错误： “此文档已经有一个 'DocumentElement' 节点。” 我的灵感来自这里的答案
and edited my code: (xmlDoc.DocumentElement.AppendChild(body))
和编辑我的代码：（xmlDoc中DocumentElement.AppendChild（体））
//a dictionary:
Dictionary<string, string> Level2Data
{
{"level2", "text"},
{"level2", "other text"},
{"same_level2", "more text"}
}
//xml Decalration:
XmlDocument xmlDoc = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
XmlElement root = xmlDoc.DocumentElement;
xmlDoc.InsertBefore(xmlDeclaration, root);
// add body
XmlElement body = xmlDoc.CreateElement(string.Empty, "body", string.Empty);
xmlDoc.AppendChild(body);
XmlElement body = xmlDoc.CreateElement(string.Empty, "body", string.Empty);
xmlDoc.DocumentElement.AppendChild(body); //without DocumentElement ->ERR
foreach (KeyValuePair<string, string> entry in Level2Data)
{
//write to xml: - it works version 1.
XmlNode keyNode = xmlDoc.CreateElement(entry.Key); //open TAB
keyNode.InnerText = entry.Value;
body.AppendChild(keyNode); //close TAB
//Write to xmml verdion 2: (uncomment the next 4 lines and comment the above 3 - version 1
//XmlElement key = xmlDoc.CreateElement(string.Empty, entry.Key, string.Empty);
//XmlText value = xmlDoc.CreateTextNode(entry.Value);
//key.AppendChild(value);
//body.AppendChild(key);
}
Both versions (1 and 2 inside foreach loop) give the output:
两个版本（foreach 循环中的 1 和 2）都给出了输出：
<?xml version="1.0" encoding="UTF-8"?>
<body>
<level1>
<level2>text</level2>
<level2>ther text</level2>
<same_level2>more text</same_level2>
</level1>
</body>
(Note: third line "same level2" in dictionary can be also level2 as the others but I wanted to ilustrate the advantage of the dictionary - in my case I needed level2 with different names.
（注意：字典中的第三行“same level2”也可以是与其他行一样的 level2，但我想说明字典的优势 - 在我的情况下，我需要具有不同名称的 level2。
