EF架构~XMLRepository仓储的实现
对于数据仓储大家应该都很熟悉了，它一般由几个仓储规范和实现它的具体类组成，而仓储的接口与架构本身无关，对于仓储的实现，你可以选择linq2Sql,EF,Nosql，及XML
等等，之前我介绍过linq2Sql,ef和nosql(redis)的仓储实现，今天主要说一下xml仓储的实现。
下面的相关核心代码
XML实体基类
/// <summary> /// XML实体基类 /// </summary> public abstract class XMLEntity { private string id = Guid.NewGuid().ToString(); /// <summary> /// XML实体主键 /// </summary> public string RootID { get { return id; } set { id = value; } } }
XML实体的仓储操作
/// <summary> /// XML文件数据仓储 /// XML结构为Element /// </summary> /// <typeparam name="TEntity"></typeparam> public class XMLRepository<TEntity> : IRepository<TEntity> where TEntity : XMLEntity, new() { XDocument _doc; string _filePath; static object lockObj = new object(); public XMLRepository(string filePath) { _filePath = filePath; _doc = XDocument.Load(filePath); } public void Insert(TEntity item) { if (item == null) throw new ArgumentException("The database entity can not be null."); XElement db = new XElement(typeof(TEntity).Name); foreach (var member in item.GetType() .GetProperties() .Where(i => i.PropertyType.IsValueType || i.PropertyType == typeof(String)))//只找简单类型的属性 { db.Add(new XElement(member.Name, new XAttribute("value", member.GetValue(item, null)))); } _doc.Root.Add(db); lock (lockObj) { _doc.Save(_filePath); } } public void Delete(TEntity item) { if (item == null) throw new ArgumentException("The database entity can not be null."); XElement xe = (from db in _doc.Root.Elements(typeof(TEntity).Name) where db.Element("RootID").Attribute("value").Value == item.RootID select db).Single() as XElement; xe.Remove(); lock (lockObj) { _doc.Save(_filePath); } } public void Update(TEntity item) { if (item == null) throw new ArgumentException("The database entity can not be null."); XElement xe = (from db in _doc.Root.Elements(typeof(TEntity).Name) where db.Element("RootID").Attribute("value").Value == item.RootID select db).Single(); try { foreach (var member in item.GetType() .GetProperties() .Where(i => i.PropertyType.IsValueType || i.PropertyType == typeof(String)))//只找简单类型的属性 { xe.Add(new XElement(member.Name, new XAttribute("value", member.GetValue(item, null)))); } lock (lockObj) { _doc.Save(_filePath); } } catch { throw; } } public IQueryable<TEntity> GetModel() { IEnumerable<XElement> list = _doc.Root.Elements(typeof(TEntity).Name); IList<TEntity> returnList = new List<TEntity>(); foreach (var item in list) { TEntity entity = new TEntity(); foreach (var member in entity.GetType() .GetProperties() .Where(i => i.PropertyType.IsValueType || i.PropertyType == typeof(String)))//只找简单类型的属性 { if (item.Attribute(member.Name) != null) member.SetValue(entity, Convert.ChangeType(item.Element(member.Name).Attribute("value").Value, member.PropertyType), null); } returnList.Add(entity); } return returnList.AsQueryable(); } public TEntity Find(params object[] id) { return GetModel().FirstOrDefault(i => i.RootID == Convert.ToString(id[0])); } public void SetDbContext(IUnitOfWork unitOfWork) { throw new NotImplementedException(); } }
感觉面向对象也是一种病，但这种病我认为是正确的，当你对它的理解达到某种程度时，这种病就会犯了，并且你会相信，世间万物，皆为对象。
本文转自博客园张占岭（仓储大叔）的博客，原文链接：EF架构~XMLRepository仓储的实现，如需转载请自行联系原博主。
