C#實現XML文檔的增刪改查功能的範例程式碼分享

這篇文章主要介紹了C#實現XML文檔的增刪改查功能,結合執行個體形式分析了xml文檔的建立及C#針對xml文檔的載入及增刪改查等操作技巧,需要的朋友可以參考下

本文執行個體講述了C#實現XML文檔的增刪改查功能。分享給大家供大家參考，具體如下：

1、 建立執行個體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（BookInfo.cs）

public class BookInfo{  /// <summary>  /// 圖書ID  /// </summary>  public int BookId { set; get; }  /// <summary>  /// 圖書名稱  /// </summary>  public string Title { set; get; }  /// <summary>  /// 圖書分類  /// </summary>  public string Category { set; get; }  /// <summary>  /// 圖書語言  /// </summary>  public string Language { set; get; }  /// <summary>  /// 圖書作者  /// </summary>  public string Author { set; get; }  /// <summary>  /// 出版時間  /// </summary>  public string Year { set; get; }  /// <summary>  /// 銷售價格  /// </summary>  public decimal Price { set; get; }}

3、 建立圖書資訊商務邏輯類（BookInfoBLL.cs）

using System.Xml;  //引用相關檔案public class BookInfoBLL{  private string _basePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/xml/Books.xml"; //XML檔案路徑  private XmlDocument _booksXmlDoc = null;  //建立XML文檔對象  public BookInfoBLL()  {    try    {      _booksXmlDoc = new XmlDocument(); //初始化XML文檔對象      _booksXmlDoc.Load(_basePath);   //載入指定的XML文檔    }    catch (Exception ex)    {      throw new Exception("載入XML文檔出錯：" + ex.Message);    }  }  /// <summary>  /// 擷取圖書列表(查)  /// </summary>  /// <param name="param">參數條件</param>  /// <returns>圖書列表</returns>  public List<BookInfo> GetBookInfoList(BookInfo param)  {    List<BookInfo> bookInfoList = new List<BookInfo>();    string xPath = "bookstore/book"; //預設擷取所有圖書    if (param.BookId != 0) //根據圖書ID查詢    {      xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);    }    else if (!String.IsNullOrEmpty(param.Category)) //根據圖書類別查詢    {      xPath = String.Format("/bookstore/book[@category='{0}']", param.Category);    }    else if (!String.IsNullOrEmpty(param.Title)) //根據圖書名稱查詢    {      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); //擷取屬性值      bookInfo.Category = bookNode.Attributes["category"].Value;      bookInfo.Language = bookNode.SelectSingleNode("title").Attributes["lang"].Value; //擷取子節點的屬性值      bookInfo.Title = bookNode.SelectSingleNode("title").InnerText;   //擷取元素值      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>  /// 增加圖書資訊（增）  /// </summary>  /// <param name="param"></param>  /// <returns></returns>  public bool AddBookInfo(BookInfo param)  {    bool result = false;    XmlNode root = _booksXmlDoc.SelectSingleNode("bookstore"); //尋找<bookstore>    //建立節點    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");    //給節點賦值    bookXmlElement.SetAttribute("id", param.BookId.ToString());    bookXmlElement.SetAttribute("category", param.Category);    titleXmlElement.InnerText = param.Title; //給節點添加元素值    titleXmlElement.SetAttribute("lang", param.Language);//給節點添加屬性值    authorXmlElement.InnerText = param.Author;    yearXmlElement.InnerText = param.Year;    priceXmlElement.InnerText = param.Price.ToString();    //AppendChild 將指定的節點添加到該節點的子節點列表的末尾    bookXmlElement.AppendChild(titleXmlElement);    bookXmlElement.AppendChild(authorXmlElement);    bookXmlElement.AppendChild(yearXmlElement);    bookXmlElement.AppendChild(priceXmlElement);    root.AppendChild(bookXmlElement);    _booksXmlDoc.Save(_basePath);    result = true;    return result;  }  /// <summary>  /// 修改圖書資訊（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>  /// 刪除圖書資訊（刪）  /// </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);  //移除指定的子節點        _booksXmlDoc.Save(_basePath);        result = true;      }    }    return result;  }}