經常需要對xml文件進行操作，參考了Jquery的鏈式操作后實現了xmlHelper類。

代碼using?System;
using?System.Data;
using?System.Configuration;
using?System.Xml;
namespace?ConfigUpdate
{
????///?<summary>
????///?調用非靜態的操作方法的
????///?</summary>
????public?class?XmlHelper
????{
????????private?XmlDocument?_doc;
????????private?string?_xmlPath;
????????public?XmlHelper(string?xmlPath)
????????{
????????????_xmlPath?=?xmlPath;
????????????_doc?=?new?XmlDocument();
????????????_doc.Load(xmlPath);
????????}

????????///?<summary>
????????///?讀取數據
????????///?</summary>
????????///?<param?name="xmlPath">路徑</param>
????????///?<param?name="node">節點</param>
????????///?<param?name="attribute">屬性名，非空時返回該屬性值，否則返回串聯值</param>
????????///?<returns>string</returns>
????????public?static?string?Select(string?xmlPath,?string?node,?string?attribute)
????????{
????????????XmlDocument?doc?=?new?XmlDocument();
????????????doc.Load(xmlPath);
????????????XmlNode?xn?=?GetNode(doc,?node);
????????????string?value?=?(String.IsNullOrEmpty(attribute)???xn.InnerText?:?xn.Attributes[attribute].Value);
????????????doc.Clone();
????????????return?value;
????????}

????????///?<summary>
????????///?調用此方法后不再需要調用Execute方法。
????????///?</summary>
????????///?<param?name="node"></param>
????????///?<param?name="attribute"></param>
????????///?<returns></returns>
????????public?string?Select(string?node,?string?attribute)
????????{
????????????string?value?=?String.Empty;?;
????????????XmlNode?xn?=?GetNode(_doc,?node);
????????????value?=?(String.IsNullOrEmpty(attribute)???xn.InnerText?:?xn.Attributes[attribute].Value);
????????????return?value;
????????}

????????///?<summary>
????????///?插入數據
????????///?</summary>
????????///?<param?name="xmlPath">路徑</param>
????????///?<param?name="node">節點</param>
????????///?<param?name="element">元素名，非空時插入新元素，否則在該元素中插入屬性</param>
????????///?<param?name="attribute">屬性名，非空時插入該元素屬性值，否則插入元素值</param>
????????///?<param?name="value">值</param>
????????///?<returns></returns>
????????public?XmlHelper?Insert(string?node,?string?element,?string?attribute,?string?value)
????????{
????????????Add(_doc,?_xmlPath,?node,?element,?attribute,?value);
????????????return?this;
????????}

????????public?static?void?Insert(string?xmlPath,?string?node,?string?element,?string?attribute,?string?value)
????????{
????????????XmlDocument?doc?=?new?XmlDocument();
????????????doc.Load(xmlPath);
????????????Add(doc,?xmlPath,?node,?element,?attribute,?value);
????????}

????????private?static?void?Add(XmlDocument?doc,?string?xmlPath,?string?node,?string?element,?string?attribute,?string?value)
????????{
????????????XmlNode?xn?=?GetNode(doc,?node);
????????????if?(String.IsNullOrEmpty(element))
????????????{
????????????????if?(!String.IsNullOrEmpty(attribute))
????????????????{
????????????????????XmlElement?xe?=?(XmlElement)xn;
????????????????????xe.SetAttribute(attribute,?value);
????????????????}
????????????}
????????????else
????????????{
????????????????XmlElement?xe?=?doc.CreateElement(element);
????????????????if?(String.IsNullOrEmpty(attribute))
????????????????????xe.InnerText?=?value;
????????????????else
????????????????????xe.SetAttribute(attribute,?value);
????????????????xn.AppendChild(xe);
????????????}
????????????doc.Save(xmlPath);
????????}

????????///?<summary>
????????///?修改數據
????????///?</summary>
????????///?<param?name="xmlPath">路徑</param>
????????///?<param?name="node">節點</param>
????????///?<param?name="attribute">屬性名，非空時修改該節點屬性值，否則修改節點值</param>
????????///?<param?name="value">值</param>
????????///?<returns></returns>
????????public?static?void?Update(string?xmlPath,?string?node,?string?attribute,?string?value)
????????{
????????????XmlDocument?doc?=?new?XmlDocument();
????????????doc.Load(xmlPath);
????????????Edit(doc,?xmlPath,?node,?attribute,?value);
????????}

????????///?<summary>
????????///?插入一個節點或者屬性
????????///?</summary>
????????///?<param?name="node"></param>
????????///?<param?name="attribute"></param>
????????///?<param?name="value"></param>
????????///?<returns></returns>
????????public?XmlHelper?Update(string?node,?string?attribute,?string?value)
????????{
????????????Edit(_doc,?_xmlPath,?node,?attribute,?value);
????????????return?this;
????????}

????????private?static?void?Edit(XmlDocument?doc,?string?xmlPath,?string?node,?string?attribute,?string?value)
????????{
????????????XmlNode?xn?=?GetNode(doc,?node);
????????????XmlElement?xe?=?(XmlElement)xn;
????????????if?(String.IsNullOrEmpty(attribute))
????????????{
????????????????xe.InnerText?=?value;
????????????}
????????????else
????????????{
????????????????xe.SetAttribute(attribute,?value);
????????????}
????????????doc.Save(xmlPath);
????????}
???????
????????///?<summary>
????????///?刪除數據
????????///?</summary>
????????///?<param?name="xmlPath">路徑</param>
????????///?<param?name="node">節點如果是非根節點可使用多層節點表達式：nodelayer1>nodelayer2>nodelayer3</param>
????????///?<param?name="attribute">屬性名，非空時刪除該節點屬性值，否則刪除節點值</param>
????????///?<param?name="value">值</param>
????????///?<returns></returns>
????????public?static?void?Remove(string?xmlPath,?string?node,?string?attribute)
????????{
????????????XmlDocument?doc?=?new?XmlDocument();
????????????doc.Load(xmlPath);
????????????Delete(doc,?xmlPath,?node,?attribute);
????????}

????????public?XmlHelper?Delete(string?node,?string?attribute)
????????{
????????????Delete(_doc,?_xmlPath,?node,?attribute);
????????????return?this;
????????}

????????private?static?void?Delete(XmlDocument?doc,?string?xmlPath,?string?node,?string?attribute)
????????{
????????????XmlNode?xn?=?GetNode(doc,?node);
????????????XmlElement?xe?=?(XmlElement)xn;
????????????if?(String.IsNullOrEmpty(attribute))
????????????{
????????????????xn.ParentNode.RemoveChild(xn);
????????????}
????????????else
????????????{
????????????????xe.RemoveAttribute(attribute);
????????????}
????????????doc.Save(xmlPath);
????????}
????????///?<summary>
????????///?返回節點
????????///?</summary>
????????///?<param?name="doc"></param>
????????///?<param?name="node">節點表達式</param>
????????///?<returns></returns>
????????private?static?XmlNode?GetNode(XmlDocument?doc,?string?node)
????????{
????????????if?(String.IsNullOrEmpty(node))
????????????{
????????????????throw?new?ArgumentNullException("節點不能為空");
????????????}
????????????string[]?nodelayers?=?node.Split('>');
????????????XmlNode?xn?=?doc.SelectSingleNode(nodelayers[0]);
????????????for?(int?i?=?1;?i?<?nodelayers.Length;?i++)
????????????{
????????????????if?(String.IsNullOrEmpty(nodelayers[i]))
????????????????{
????????????????????throw?new?ArgumentException(String.Format("第{0}級節點為空",i+1));
????????????????}
????????????????else
????????????????{
????????????????????xn?=?xn.SelectSingleNode(nodelayers[i]);
????????????????}
????????????}
????????????return?xn;
????????}
????}
}

?

?使用示例：

代碼string?_configPath?=?"config.xml";
???????????XmlHelper.Insert(_configPath,?"configuration","mynode",null,"kk");
?
???????????string?msg=?new?XmlHelper(_configPath)
???????????????.Insert("configuration",?"mynode",?null,?"kk")
???????????????.Update("configuration>mynode",?null,?"zhao")
???????????????.Select("configuration>mynode",?null);
???????????MessageBox.Show(msg);
???

?

?xml內容

?<?xml?version="1.0"?encoding="utf-8"?>

<configuration>
</configuration>

?

轉載于:https://www.cnblogs.com/luckuny/archive/2011/02/22/1961255.html

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