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。
