Generieren Sie dynamisch XML-Dateien mit Buchinformationen über C#

Generieren Sie dynamisch eine XML-Datei mit Buchinformationen (Books.xml) über C#. Die Datei lautet wie folgt:

<?xml version="1.0" encoding="iso-8859-1"?>   
<bookstore>   
  
<book id="1" category="CHILDREN">   
<title>Harry Potter</title>   
<author>J K. Rowling</author>   
<publishDate>2005-08-15</publishDate>   
<price>29.99</price>   
</book>   
  
<book id="2" category="WEB">   
<title>Learning XML</title>   
<author>Erik T. Ray</author>   
<publishDate>2003-10-18</publishDate>   
<price>39.95</price>   
</book>   
  
</bookstore>

Methode 1: Verwenden Sie StringBuilder, um XML zu verbinden

/// <summary> 
/// 创建图书信息XML 
/// </summary> 
public void CreateBookXML(string fileName) 
{ 
StringBuilder xmlResult = new StringBuilder("<?xml version=\"1.0\" encoding=\"utf-8\"?>"); 
List<BookInfo> bookList = GetBookList(); //获取图书列表 
if (bookList != null && bookList.Count > 0) 
{ 
xmlResult.Append("<bookstore>"); 
foreach (BookInfo book in bookList) 
{ 
xmlResult.AppendFormat("<book id=\"{0}\" category=\"{1}\">", book.BookId, book.Category); 
xmlResult.AppendFormat("<title>{0}</title>", book.Title); 
xmlResult.AppendFormat("<author>{0}</author>", book.Author); 
xmlResult.AppendFormat("<publishDate>{0}</publishDate>", book.PublishDate.ToString("yyyy-MM-dd")); 
xmlResult.AppendFormat("<price>{0}</price>", book.Price); 
xmlResult.Append("</book>"); 
} 
xmlResult.Append("</bookstore>"); 
} 

//写入文件 
try 
{ 
//1.创建文件流 
FileStream fileStream = new FileStream(fileName, FileMode.Create); 
//2.创建写入器 
StreamWriter streamWriter = new StreamWriter(fileStream); 
//3.将内容写入文件 
streamWriter.WriteLine(xmlResult); 
//4.关闭写入器 
streamWriter.Close(); 
//5.关闭文件流 
fileStream.Close(); 
} 
catch (Exception e) 
{ } 
}

Methode 2: XML mit der XmlTextWriter-Klasse erstellen

/// <summary> 
/// 创建图书信息XML 
/// </summary> 
/// <param name="fileName"></param> 
public void CreateBookXML(string fileName) 
{ 
try 
{ 
FileStream fileStream = new FileStream(fileName, FileMode.Create); 
XmlTextWriter writer = new XmlTextWriter(fileStream, Encoding.UTF8); 
List<BookInfo> bookList = GetBookList(); //获取图书列表 
if (bookList != null && bookList.Count > 0) 
{ 
writer.WriteStartDocument(); 
writer.WriteStartElement("bookstore"); //创建父节点 
foreach (BookInfo book in bookList) 
{ 
writer.WriteStartElement("book"); //创建子节点 
writer.WriteAttributeString("id", book.BookId.ToString()); //添加属性 
writer.WriteAttributeString("category", book.Category); 
//图书名称节点 
writer.WriteStartElement("title"); 
writer.WriteValue(book.Title); //节点赋值 
writer.WriteEndElement(); 
//图书作者节点 
writer.WriteStartElement("author"); 
writer.WriteValue(book.Author); 
writer.WriteEndElement(); 
//出版时间节点 
writer.WriteStartElement("publishDate"); 
writer.WriteValue(book.PublishDate.ToString("yyyy-MM-dd")); 
writer.WriteEndElement(); 
//销售价格节点 
writer.WriteStartElement("price"); 
writer.WriteValue(book.Price); 
writer.WriteEndElement(); 

writer.WriteEndElement(); //子节点结束 
} 
writer.WriteEndElement(); //父节点结束 
} 
writer.WriteEndDocument(); 
writer.Close(); 
fileStream.Close(); 
} 
catch (Exception e) 
{ } 
}

WriteStartDocument()-Methode: XML-Deklaration schreiben.
WriteEndDocument()-Methode: Schließt alle offenen Elemente oder Attribute und setzt den Writer auf den Startstatus zurück.
WriteStartElement(string localName)-Methode: Erstellt den Anfang eines Knotens.
WriteAttributeString(string localName, string value) Methode: Attribute zu Knoten hinzufügen.
WriteValue(value)-Methode: Weisen Sie dem Knoten einen Wert zu.

3. Andere Codes

3.1 Buchliste abrufen

/// <summary>   
/// 获取图书列表   
/// </summary>   
/// <returns></returns>   
public List<BookInfo> GetBookList()   
{   
List<BookInfo> bookList = new List<BookInfo>();   
BookInfo book1 = new BookInfo() {   
BookId = 1,   
Category = "CHILDREN",   
Title = "Harry Potter",   
Author = "J K. Rowling",   
PublishDate = new DateTime(2005,08,15),   
Price = 29.99   
};   
bookList.Add(book1);   
BookInfo book2 = new BookInfo()   
{   
BookId = 2,   
Category = "WEB",   
Title = "Learning XML",   
Author = "Erik T. Ray",   
PublishDate = new DateTime(2003,10,18),   
Price = 39.95   
};   
bookList.Add(book2);   
return bookList;   
}

3.2 Buchinformations-Entitätsklasse

/// <summary>   
/// 图书信息实体类   
/// </summary>   
public class BookInfo   
{   
public int BookId { set; get; } //图书ID   
public string Title { set; get; } //图书名称   
public string Category { set; get; } //图书分类   
public string Author { set; get; } //图书作者   
public DateTime PublishDate { set; get; } //出版时间   
public Double Price { set; get; } //销售价格   
}

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