Xml通用操作类

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Xml;

namespace CommonUtil
{
	/// <summary>
	/// Xml通用操作类
	/// </summary>
	public class XmlHelper
	{
		public XmlHelper()
		{
		}

		/// <summary>
		/// 创建XML文件
		/// </summary>
		/// <param name="path">路径</param>
		/// <param name="filename">xml文件名称（包含后缀名）</param>
		/// <param name="rootname">根节点名称</param>
		/**************************************************
		 * 使用示列:
		 * XmlHelper.CreateXmlFile(path, "text.xml", "root")
		 ************************************************/
		public static void CreateXmlFile(string path, string filename, string rootname)
		{
			try
			{
				if (path.Equals(""))
					throw new Exception("路径不能为空！");

				if (filename.Equals(""))
					throw new Exception("文件名称不能为空！");

				if (!filename.Split('.').GetValue(filename.Split('.').Length - 1).ToString().ToLower().Equals("xml"))
					throw new Exception("文件后缀名称必须为xml！");

				if (rootname.Equals(""))
					throw new Exception("根节点名称不能为空！");

				if (!Directory.Exists(path)) //如果路径不存在，则创建路径
					Directory.CreateDirectory(path);

				StringBuilder builder = new StringBuilder();
				builder.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
				if (!rootname.Equals(""))
				{
					builder.AppendLine("<" + rootname + ">");
					builder.AppendLine("</" + rootname + ">");
				}

				string fullpath = string.Empty;
				XmlDocument doc = new XmlDocument();
				doc.LoadXml(builder.ToString());
				if (path.LastIndexOf('\\') == path.Length - 1)
					fullpath = path + filename;
				else
					fullpath = path + "\\" + filename;
				doc.Save(fullpath); //保存xml文件
			}
			catch
			{
				throw;
			}
		}

		/// <summary>
		/// 读取数据
		/// </summary>
		/// <param name="path">全路径</param>
		/// <param name="node">节点</param>
		/// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param>
		/// <returns>string</returns>
		/**************************************************
		 * 使用示列:
		 * XmlHelper.Read(path, "/Node", "")
		 * XmlHelper.Read(path, "/Node/Element[@Attribute='Value']", "Attribute")
		 ************************************************/
		public static string Read(string path, string node, string attribute)
		{
			string value = "";
			try
			{
				if (!File.Exists(path))
					throw new Exception("xml文件不存在！");

				if (node.Equals(""))
					throw new Exception("节点名称不能为空！");

				XmlDocument doc = new XmlDocument();
				doc.Load(path);
				XmlNode xn = doc.SelectSingleNode(node);
				value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);
			}
			catch
			{
				throw;
			}
			return value;
		}

		/// <summary>
		/// 读取数据
		/// </summary>
		/// <param name="path">全路径</param>
		/// <param name="node">节点</param>
		/// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param>
		/// <returns></returns>
		public static List<string> ReadToList(string path, string node, string attribute)
		{
			List<string> nodelist = new List<string>();

			try
			{
				if (!File.Exists(path))
					throw new Exception("xml文件不存在！");

				if (node.Equals(""))
					throw new Exception("节点名称不能为空！");

				XmlDocument doc = new XmlDocument();
				doc.Load(path);
				XmlNodeList nodes = doc.SelectNodes(node);
				if (nodes != null && nodes.Count > 0)
				{
					foreach (XmlNode n in nodes)
					{
						if (attribute.Equals(""))
							nodelist.Add(n.InnerText);
						else
							nodelist.Add(n.Attributes[attribute].Value);
					}
				}
				else
				{
					nodelist = null;
				}
			}
			catch
			{
				throw;
			}

			return nodelist;
		}

		/// <summary>
		/// 插入数据
		/// </summary>
		/// <param name="path">全路径</param>
		/// <param name="node">节点</param>
		/// <param name="element">元素名，非空时插入新元素，否则在该元素中插入属性</param>
		/// <param name="attribute">属性名，非空时插入该元素属性值，否则插入元素值</param>
		/// <param name="value">值</param>
		/// <returns></returns>
		/**************************************************
		 * 使用示列:
		 * XmlHelper.Insert(path, "/Node", "Element", "", "Value")
		 * XmlHelper.Insert(path, "/Node", "Element", "Attribute", "Value")
		 * XmlHelper.Insert(path, "/Node", "", "Attribute", "Value")
		 * XmlHelper.Insert(path, "/Node/Element[@Attribute='Value']", "Element", "Attribute", "Value");
		 ************************************************/
		public static void Insert(string path, string node, string element, string attribute, string value)
		{
			try
			{
				if (!File.Exists(path))
					throw new Exception("xml文件不存在！");

				if (node.Equals(""))
					throw new Exception("节点名称不能为空！");

				if (element.Equals("") && attribute.Equals(""))
					throw new Exception("元素名和属性名不能同时为空！");

				XmlDocument doc = new XmlDocument();
				doc.Load(path);
				XmlNode xn = doc.SelectSingleNode(node);
				if (element.Equals(""))
				{
					if (!attribute.Equals(""))
					{
						XmlElement xe = (XmlElement)xn;
						xe.SetAttribute(attribute, value);
					}
				}
				else
				{
					XmlElement xe = doc.CreateElement(element);
					if (attribute.Equals(""))
						xe.InnerText = value;
					else
						xe.SetAttribute(attribute, value);
					xn.AppendChild(xe);
				}
				doc.Save(path);
			}
			catch
			{
				throw;
			}
		}

		/// <summary>
		/// 修改数据
		/// </summary>
		/// <param name="path">全路径</param>
		/// <param name="node">节点</param>
		/// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param>
		/// <param name="value">值</param>
		/// <returns></returns>
		/**************************************************
		 * 使用示列:
		 * XmlHelper.Insert(path, "/Node", "", "Value")
		 * XmlHelper.Insert(path, "/Node", "Attribute", "Value")
		 ************************************************/
		public static void Update(string path, string node, string attribute, string value)
		{
			try
			{
				if (!File.Exists(path))
					throw new Exception("xml文件不存在！");

				if (node.Equals(""))
					throw new Exception("节点名称不能为空！");

				XmlDocument doc = new XmlDocument();
				doc.Load(path);
				XmlNode xn = doc.SelectSingleNode(node);
				XmlElement xe = (XmlElement)xn;
				if (attribute.Equals(""))
					xe.InnerText = value;
				else
					xe.SetAttribute(attribute, value);
				doc.Save(path);
			}
			catch
			{
				throw;
			}
		}

		/// <summary>
		/// 删除数据
		/// </summary>
		/// <param name="path">全路径</param>
		/// <param name="node">节点</param>
		/// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param>
		/// <param name="value">值</param>
		/// <returns></returns>
		/**************************************************
		 * 使用示列:
		 * XmlHelper.Delete(path, "/Node", "")
		 * XmlHelper.Delete(path, "/Node", "Attribute")
		 ************************************************/
		public static void Delete(string path, string node, string attribute)
		{
			try
			{
				if (!File.Exists(path))
					throw new Exception("xml文件不存在！");

				if (node.Equals(""))
					throw new Exception("节点名称不能为空！");

				XmlDocument doc = new XmlDocument();
				doc.Load(path);
				XmlNodeList nodes = doc.SelectNodes(node);
				if (nodes != null && nodes.Count > 0)
				{
					foreach (XmlNode xn in nodes)
					{
						XmlElement xe = (XmlElement)xn;
						if (attribute.Equals(""))
							xn.ParentNode.RemoveChild(xn);
						else
							xe.RemoveAttribute(attribute);
					}
					doc.Save(path);
				}
			}
			catch
			{
				throw;
			}
		}
	}
}