這篇文章主要介紹了C#實作XML文件的增刪改查功能,結合實例形式分析了xml文件的建立及C#針對xml文件的載入及增刪改查等操作技巧,需要的朋友可以參考下
本文實例講述了C#實作XML文件的增刪改查功能。分享給大家供大家參考，具體如下：
1、 建立實例XML檔案（Books.xml）
<?xml version="1.0" encoding="iso-8859-1"?> <bookstore> <book id="1" category="COOKING"> <title lang="en">Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book id="2" category="CHILDREN"> <title lang="en">Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book id="3" category="WEB"> <title lang="en">XQuery Kick Start</title> <author>James McGovern</author> <author>Per Bothner</author> <author>Kurt Cagle</author> <author>James Linn</author> <author>Vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> <book id="4" category="WEB"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>
2、 建立圖書資訊實體類別（BookInfo.cs）
public class BookInfo
{
/// <summary>
/// 图书ID
/// </summary>
public int BookId { set; get; }
/// <summary>
/// 图书名称
/// </summary>
public string Title { set; get; }
/// <summary>
/// 图书分类
/// </summary>
public string Category { set; get; }
/// <summary>
/// 图书语言
/// </summary>
public string Language { set; get; }
/// <summary>
/// 图书作者
/// </summary>
public string Author { set; get; }
/// <summary>
/// 出版时间
/// </summary>
public string Year { set; get; }
/// <summary>
/// 销售价格
/// </summary>
public decimal Price { set; get; }
}3、 建立圖書資訊業務邏輯類別（BookInfoBLL.cs）
using System.Xml; //引用相关文件
public class BookInfoBLL
{
private string _basePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/xml/Books.xml"; //XML文件路径
private XmlDocument _booksXmlDoc = null; //创建XML文档对象
public BookInfoBLL()
{
try
{
_booksXmlDoc = new XmlDocument(); //初始化XML文档对象
_booksXmlDoc.Load(_basePath); //加载指定的XML文档
}
catch (Exception ex)
{
throw new Exception("加载XML文档出错：" + ex.Message);
}
}
/// <summary>
/// 获取图书列表(查)
/// </summary>
/// <param name="param">参数条件</param>
/// <returns>图书列表</returns>
public List<BookInfo> GetBookInfoList(BookInfo param)
{
List<BookInfo> bookInfoList = new List<BookInfo>();
string xPath = "bookstore/book"; //默认获取所有图书
if (param.BookId != 0) //根据图书ID查询
{
xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);
}
else if (!String.IsNullOrEmpty(param.Category)) //根据图书类别查询
{
xPath = String.Format("/bookstore/book[@category='{0}']", param.Category);
}
else if (!String.IsNullOrEmpty(param.Title)) //根据图书名称查询
{
xPath = String.Format("/bookstore/book[title='{0}']", param.Title);
}
XmlNodeList booksXmlNodeList = _booksXmlDoc.SelectNodes(xPath);
foreach (XmlNode bookNode in booksXmlNodeList)
{
BookInfo bookInfo = new BookInfo();
bookInfo.BookId = Convert.ToInt32(bookNode.Attributes["id"].Value); //获取属性值
bookInfo.Category = bookNode.Attributes["category"].Value;
bookInfo.Language = bookNode.SelectSingleNode("title").Attributes["lang"].Value; //获取子节点的属性值
bookInfo.Title = bookNode.SelectSingleNode("title").InnerText; //获取元素值
bookInfo.Author = bookNode.SelectSingleNode("author").InnerText;
bookInfo.Year = bookNode.SelectSingleNode("year").InnerText;
bookInfo.Price = Convert.ToDecimal(bookNode.SelectSingleNode("price").InnerText);
bookInfoList.Add(bookInfo);
}
return bookInfoList;
}
/// <summary>
/// 增加图书信息（增）
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public bool AddBookInfo(BookInfo param)
{
bool result = false;
XmlNode root = _booksXmlDoc.SelectSingleNode("bookstore"); //查找<bookstore>
//创建节点
XmlElement bookXmlElement = _booksXmlDoc.CreateElement("book");
XmlElement titleXmlElement = _booksXmlDoc.CreateElement("title");
XmlElement authorXmlElement = _booksXmlDoc.CreateElement("author");
XmlElement yearXmlElement = _booksXmlDoc.CreateElement("year");
XmlElement priceXmlElement = _booksXmlDoc.CreateElement("price");
//给节点赋值
bookXmlElement.SetAttribute("id", param.BookId.ToString());
bookXmlElement.SetAttribute("category", param.Category);
titleXmlElement.InnerText = param.Title; //给节点添加元素值
titleXmlElement.SetAttribute("lang", param.Language);//给节点添加属性值
authorXmlElement.InnerText = param.Author;
yearXmlElement.InnerText = param.Year;
priceXmlElement.InnerText = param.Price.ToString();
//AppendChild 将指定的节点添加到该节点的子节点列表的末尾
bookXmlElement.AppendChild(titleXmlElement);
bookXmlElement.AppendChild(authorXmlElement);
bookXmlElement.AppendChild(yearXmlElement);
bookXmlElement.AppendChild(priceXmlElement);
root.AppendChild(bookXmlElement);
_booksXmlDoc.Save(_basePath);
result = true;
return result;
}
/// <summary>
/// 修改图书信息（改）
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public bool EditBookInfo(BookInfo param)
{
bool result = false;
if(param.BookId>0)
{
string xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);
XmlNode editXmlNode = _booksXmlDoc.SelectSingleNode(xPath);
XmlElement editXmlElement = (XmlElement)editXmlNode;
if (editXmlElement != null)
{
editXmlElement.Attributes["category"].Value = param.Category;
editXmlElement.SelectSingleNode("title").Attributes["lang"].Value = param.Language;
editXmlElement.SelectSingleNode("title").InnerText = param.Title;
editXmlElement.SelectSingleNode("author").InnerText = param.Author;
editXmlElement.SelectSingleNode("year").InnerText = param.Year;
editXmlElement.SelectSingleNode("price").InnerText = param.Price.ToString();
_booksXmlDoc.Save(_basePath);
result = true;
}
}
return result;
}
/// <summary>
/// 删除图书信息（删）
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public bool DeleteBookInfo(BookInfo param)
{
bool result = false;
if (param.BookId > 0)
{
string xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);
XmlNode delXmlNode = _booksXmlDoc.SelectSingleNode(xPath);
if (delXmlNode != null)
{
_booksXmlDoc.SelectSingleNode("bookstore").RemoveChild(delXmlNode); //移除指定的子节点
_booksXmlDoc.Save(_basePath);
result = true;
}
}
return result;
}
}以上是C#實作XML文件的增刪改查功能的範例程式碼分享的詳細內容。更多資訊請關注PHP中文網其他相關文章！
