對 XML 操作的輔助類

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

namespace Lhyi.Helper
{
    /// <summary>
    /// 對 XML 操作的輔助類
    /// </summary>
    public class XmlHelper
    {
        #region 常量

        /// <summary>
        /// XML文件的聲明
        /// </summary>
        public const string XML_STATEMENT = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";

        private const string NAME = "add";
        private const string KEY = "key";
        private const string VALUE = "value";

        #endregion

        #region 方法
        /// <summary>
        /// 通過文件地址加載Xml文件，獲取XmlDocument對象
        /// </summary>
        /// <param name="filePath">xml文件地址所在的系統目錄</param>
        /// <param name="assemblyPath">文件所在的程序集地址[針對嵌入的資源]</param>
        /// <returns>XmlDocument 對象</returns>
        public static XmlDocument LoadXml(string filePath, string assemblyPath)
        {
            XmlDocument document = new XmlDocument();
            try
            {
                if (File.Exists(filePath))
                {
                    document.Load(filePath);
                }
                else
                {
                    Assembly assembly = Assembly.GetEntryAssembly();
                    Stream stream = assembly.GetManifestResourceStream(assemblyPath);
                    document.Load(stream);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("XmlHelper.LoadXml(string, string) :: " + ex.Message);
                throw ex;
            }
            return document;
        }

        /// <summary>
        /// 生成XML字符串
        /// </summary>
        /// <param name="root">根節點</param>
        /// <param name="allNodes">所有的子節點</param>
        /// <param name="allValues">所有子節點對應的數據</param>
        /// <returns></returns>
        public static string CreateXmlStr(string root, string[] allNodes, string[] allValues)
        {
            #region 拼接字符串

            //StringBuilder sb = new StringBuilder();
            //sb.Append("<" + headStr + ">");
            //for (int i = 0; i < allNodes.Length; i++)
            //{
            //    sb.Append("<" + allNodes[i] + ">" + allValues[i] + "</" + allNodes[i] + ">");
            //}
            //sb.Append("/" + headStr + ">");
            //return sb.ToString();

            #endregion

            XmlDocument doc = new XmlDocument();
            try
            {
                //添加xml文件的聲明
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
                doc.AppendChild(dec);
                //添加根節點
                XmlElement rootNode = doc.CreateElement(root);
                doc.AppendChild(rootNode);
                //添加子節點
                for (int i = 0; i < allNodes.Length; i++)
                {
                    XmlElement childNode = doc.CreateElement(allNodes[i]);
                    childNode.InnerText = allValues[i];
                    rootNode.AppendChild(childNode);
                }
                //doc.Save("\\demo.xml");
            }
            
            catch (Exception ex)
            {
                Debug.WriteLine("XmlHelper.CreateXmlStr(string, string[], string[]) :: " + ex.Message);
                throw ex;
            }
            return doc.InnerXml;
        }

        /// <summary>
        /// 返回對應的實體集合
        ///     訪問的XML文件與之對應的 實體類 名稱必須大小寫一致，數據類型必須是String
        ///     並且XML的編寫格式必須按要求編寫
        /// </summary>
        /// <typeparam name="T">泛型</typeparam>
        /// <param name="document">XmlDocument對象</param>
        /// <returns></returns>
        public static List<T> Select<T>(XmlDocument document)
        {
            List<T> list = new List<T>();
            XmlNode xmlRoot = document.DocumentElement;
            if (xmlRoot != null)
            {
                T obj = default(T);
                Type type = typeof(T);
                PropertyInfo[] propertyInfos = type.GetProperties();
                try
                {
                    foreach (XmlNode xmlNode in xmlRoot.ChildNodes)
                    {
                        if (String.Compare(xmlNode.Name, type.Name, true) == 0)
                        {
                            obj = Activator.CreateInstance<T>();
                            foreach (PropertyInfo propertyInfo in propertyInfos)
                            {
                                String propertyName = propertyInfo.Name;//獲取屬性名稱
                                object value = xmlNode.Attributes[propertyName].Value;//從XML中得到該屬性的Value值
                                propertyInfo.SetValue(obj, value, null);//將得到的屬性值賦給obj對象
                            }
                            list.Add(obj);
                        }
                    }
                }
                catch (Exception ex)
                {
                    Debug.WriteLine("XmlHelper.Select<T>(XmlDocument) :: " + ex.Message);
                    throw ex;
                }
            }
            return list;
        }

        #endregion
    }
}