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  • [开发笔记]-Linq to xml学习笔记

    最近需要用到操作xml文档的方法,学习了一下linq to xml,特此记录。

    测试代码:

    class Program
        {
    
            //参考:  LINQ to XML 编程基础 - luckdv - 博客园  http://www.cnblogs.com/luckdv/articles/1728088.html 
    
    
            static void Main(string[] args)
            {
                string path = @"E:def5.xml";
                //第一种方法 创建
                //XDocument xdoc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"),new XElement("nianhui",new XElement("mingdan",new XText("这里是人名单")),new XElement("jiangxiang",new XText("这里是奖项"))));
                //xdoc.Save(path);
    
    
    
                //第二种方法 创建
                //XElement root = new XElement("nianhui",
                //    new XElement("first", "名单"),
                //    new XElement("second", "第二项")
                //    );
    
                //root.Save(path);
    
    
                //修改一个Element
                //XElement rootload = XElement.Load(path);
                //XElement md = rootload.Element("mingdan");
                //if (md != null)
                //{
                //    替换一个节点
                //    md.ReplaceWith(new XElement("mingdan", "哈哈哈哈"));
    
                //}
                //else
                //{
                //    添加一个节点
                //    rootload.Add(new XElement("mingdan", "又建了一个"));
                //}
                //rootload.Save(path);
    
    
    
                //创建根节点
                //XElement root=new XElement("nianhui");
                //root.Save(path);
    
    
                //获取Value值
                //string x= GetElementValue(path,"mingda");
                //Console.WriteLine(x);
    
    
                //删除节点
                //DelElement(path, "mingdan");
    
                //XElement root = XElement.Load(Xpath);
                //XElement element = root.Element(Xname);
                //if (element != null)
                //{
                //    element.Remove();
                //}
                ////保存修改  操作完成后一定要将修改保存回去
                //root.Save(Xpath);
    
                //为一级节点添加子节点
                //XElement root = XElement.Load(path);
                //XElement element = root.Element("xing");
                //element.Add(new XElement("heihei","what"));
                //root.Save(path); 
    
    
    
                //------------带属性的xml----------------------------------------------
    
                //创建带属性的xml节点
                //XElement xdoc = new XElement("root", new XElement("first",new XAttribute("ID","001")),new XElement("second","行内的value"));
                //xdoc.Save(path);
    
                //创建带多个属性的xml节点
                //XElement xdoc = new XElement("root",new XElement("first",new XAttribute("name","002"),new XAttribute("path","abc.txt")));
                //xdoc.Save(path);
    
    
                //更新某属性的值
                //XElement xdoc = XElement.Load(path);
    
                //获取某节点元素
                //XElement x = xdoc.Element("first");
                //string x2 = x.Attribute("path").Value;
                //Console.WriteLine(x2);
    
                //更新某属性的值
                //XElement x3 = xdoc.Element("first");
                //if (x3 != null)
                //{
                //    XAttribute a1 = x3.Attribute("path");
                //    if (a1 != null)
                //    {
                //        a1.SetValue("wohuanle");
                //    }
                //}
                //xdoc.Save(path);
    
    
                //获取某属性的值
    
                //XElement xdoc = XElement.Load(path);
                //XElement x4 = xdoc.Element("first");
                //if (x4 != null)
                //{
                //    XAttribute a2 = x4.Attribute("path");
                //    if (a2 != null)
                //    {
                //        Console.WriteLine(a2.Value);
                //    }
                //    else
                //    {
                //        Console.WriteLine("");
                //    }
                //}
    
    
                //为某节点添加属性
                //XElement xdoc = XElement.Load(path);
                //XElement x4 = xdoc.Element("first");
                //if (x4 != null)
                //{
                //    x4.SetAttributeValue("hah", "what");
                //}
                //xdoc.Save(path);
    
    
                //修改某节点的属性  如果不存在该属性则添加
                //XElement xdoc = XElement.Load(path);
                //XElement x4 = xdoc.Element("mingdan");
                //if (x4 != null)
                //{
                //    XAttribute attr = x4.Attribute("number");
                //    if (attr != null)
                //    {
                //        //存在该属性
                //        attr.SetValue("woshixinzengjiade");
                //    }
                //    else
                //    {
                //        //不存在该属性
                //        x4.SetAttributeValue("number", "meizhegeshuxing");
                //    }
                //}
                //xdoc.Save(path);
    
    
                //尝试获取xml文档中任意一个节点 但测试不成功
                //XElement xdoc = XElement.Load(path);
                ////XElement x4 = xdoc.Element("mingdan");
    
                //IEnumerable<XElement> element = from e in xdoc.Elements()
                //             where e.Elements().Any(c=>c.Name=="xing")
                //              select e;
                //foreach (XElement it in element)
                //{
                //  Console.WriteLine(  it.Value);
                //}
    
    
                //为某一级节点添加属性
                //Dictionary<string,string> ss=new Dictionary<string,string>();
                //ss.Add("na","01");ss.Add("nb","02");
                //CreateAttr(path, "heihei",ss);
    
    
                //删除某一级子节点的属性
                XElement xdoc = XElement.Load(path);
                XElement x4 = xdoc.Element("mingdan");
                if (x4 != null)
                {
                    if (x4.Attribute("number") != null)
                    {
                        x4.Attribute("number").Remove();
                    }
                }
                xdoc.Save(path);
    
    
                Console.ReadKey();
    
            }
    
    
    
    
    
            #region 为某一级节点添加属性
            /// <summary>
            /// 为某一级节点添加属性
            /// </summary>
            /// <param name="Xpath">文件路径</param>
            /// <param name="Xname">一级节点名称</param>
            /// <param name="Attr">属性集</param>
            static void CreateAttr(string Xpath, string Xname, Dictionary<string, string> Attr)
            {
                XElement xdoc = XElement.Load(Xpath);
                XElement x4 = xdoc.Element(Xname);
                if (x4 != null)
                {
                    foreach (var item in Attr)
                    {
                        x4.Add(new XAttribute(item.Key, item.Value));
                    }
                }
                xdoc.Save(Xpath);
            }
            #endregion
    
    
    
            #region 初始化根节点为Xroot的xml文档
            /// <summary>
            /// 初始化根节点为Xroot的xml文档
            /// </summary>
            /// <param name="Xpath"></param>
            /// <param name="Xroot"></param>
            void InitElement(string Xpath, string Xroot)
            {
                XElement root = new XElement(Xroot);
                root.Save(Xpath);
            }
            #endregion
    
    
    
            #region 创建或更新节点
            /// <summary>
            /// 创建或更新节点
            /// </summary>
            /// <param name="Xpath"></param>
            /// <param name="Xname"></param>
            /// <param name="XValue"></param>
            void CreateElement(string Xpath, string Xname, string XValue)
            {
                //加载xml文档路径
                XElement root = XElement.Load(Xpath);
                //加载某个名称为name的节点
                XElement first = root.Element(Xname);
                if (first != null)
                {
                    //该名称的节点已存在,替换
                    first.ReplaceWith(new XElement(Xname, XValue));
                }
                else
                {
                    //该名称的节点不存在,创建
                    root.Add(new XElement(Xname, XValue));
                }
                //不要忘记保存修改
                root.Save(Xpath);
            }
            #endregion
    
    
            #region 获取某节点的Value值
            /// <summary>
            /// 获取某节点的Value值
            /// </summary>
            /// <param name="Xpath"></param>
            /// <param name="Xname"></param>
            /// <returns></returns>
            static string GetElementValue(string Xpath, string Xname)
            {
                XElement root = XElement.Load(Xpath);
                XElement element = root.Element(Xname);
                if (element != null)
                {
                    return element.Value;
                }
                else
                {
                    return "";
                }
    
            }
            #endregion
    
    
            #region 删除Name为Xname的子节点
            /// <summary>
            /// 删除Name为Xname的子节点
            /// </summary>
            /// <param name="Xpath"></param>
            /// <param name="Xname"></param>
            static void DelElement(string Xpath, string Xname)
            {
                XElement root = XElement.Load(Xpath);
                XElement element = root.Element(Xname);
                if (element != null)
                {
                    element.Remove();
                }
                //保存修改
                root.Save(Xpath);
            }
            #endregion
    
        }

    2014-1-10 10:08:37 新增加一个:

            /// <summary>
            /// 创建或添加一级节点(1个或多个)
            /// </summary>
            /// <param name="Xpath"></param>
            /// <param name="Xelement"></param>
          static void AddElement(string Xpath, Dictionary<string, string> Xelement)
          {
              //加载xml文档路径
              XElement root = XElement.Load(Xpath);
              foreach (var e in Xelement)
              {
                  //判断当前一级节点是否存在,若存在,则重新设置值,若不存在,则添加
                  XElement first = root.Element(e.Key);
                  if (first != null)
                  {
                      first.SetValue(e.Value);
                  }
                  else
                  {
                      root.SetElementValue(e.Key, e.Value);
                  }
              }
              root.Save(Xpath);
          }

      参考: LINQ to XML 编程基础 - luckdv - 博客园  http://www.cnblogs.com/luckdv/articles/1728088.html 

               

    转载请注明出处。

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  • 原文地址:https://www.cnblogs.com/babycool/p/3513065.html
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