![[开发笔记]-Linq to xml学习笔记](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1 "[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:\def\5.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。