本项目结合EF 4.3及WCF实现了经典三层架构，各层面向接口，WCF实现SOA，Repository封装调用，在此基础上实现了WCFContext，动态服务调用及一个分页的实例。
1. 项目架构图：
2. 项目解决方案：
- 在传统的三层架构上增加了WcfService（服务端），WcfClientProxy（客户端服务调用），及WcfExtension（一些扩展）
3. Wcf Service的实现：
- 工厂实现了RemoteServiceFactory（用于远程调用）和RefServiceFactory（本地引用调用服务层）生成客户端代理，都需要实现IServiceFactory的“IService CreateService();”
- RemoteServiceFactory通过ChannelFactory动态产生客户端代理类IService，并将此对象进行缓存
- WCFExtension实现了WCFContext，可传输用户登陆或IP上下文信息，以及拦截方法写Log的机制，具体可以参考 http://www.cnblogs.com/lovecindywang/archive/2012/03/01/2376144.html
3. 数据层Repository的实现：
- 通过用来访问领域对象的一个类似集合的接口，在领域与数据映射层之间进行协调，将领域模型从客户代码和数据映射层之间解耦出来，具体实现代码：
- View Code
- public class DaoBase : IRepository, IDisposable
- {
- public DbContext context;
- public DaoBase()
- {
- this.context = new EasyEF.DAL.DbContext();
- }
- public T Update<T>(T entity) where T : class
- {
- var set = context.Set<T>();
- set.Attach(entity);
- context.Entry<T>(entity).State = EntityState.Modified;
- context.SaveChanges();
- return entity;
- }
- public T Insert<T>(T entity) where T : class
- {
- context.Set<T>().Add(entity);
- context.SaveChanges();
- return entity;
- }
- public void Delete<T>(T entity) where T : class
- {
- context.Entry<T>(entity).State = EntityState.Deleted;
- context.SaveChanges();
- }
- public T Find<T>(params object[] keyValues) where T : class
- {
- return context.Set<T>().Find(keyValues);
- }
- public List<T> FindAll<T>(Expression<Func<T, bool>> conditions = null) where T : class
- {
- if (conditions == null)
- return context.Set<T>().ToList();
- else
- return context.Set<T>().Where(conditions).ToList();
- }
- public PagedList<T> FindAllByPage<T, S>(Expression<Func<T, bool>> conditions, Expression<Func<T, S>> orderBy, int pageSize, int pageIndex) where T : class
- {
- var queryList = conditions == null ? context.Set<T>() : context.Set<T>().Where(conditions) as IQueryable<T>;
- return queryList.OrderByDescending(orderBy).ToPagedList(pageIndex, pageSize);
- }
- public void Dispose()
- {
- this.context.Dispose();
- }
4. 数据层基于Entity Framwork code First：
DBContext
- View Code
- public class DbContext : System.Data.Entity.DbContext
- {
- public DbContext()
- : base("MyDbContext")
- {
- this.Configuration.ProxyCreationEnabled = false;
- }
- public DbSet<Category> Categories { get; set; }
- public DbSet<Product> Products { get; set; }
- }
Model Mapping
- View Code
- [Table("Product")]
- public partial class Product
- {
- public int Id { get; set; }
- [StringLength(50)]
- [Required(ErrorMessage = "名称不能为空")]
- public string Name { get; set; }
- public int Size { get; set; }
- [StringLength(300)]
- public string PhotoUrl { get; set; }
- public DateTime AddTime { get; set; }
- public int CategoryId { get; set; }
- public virtual Category Category { get; set; }
- }
5. 提供了MVC调用服务端分页的实例：
- MVC调用Wcf客户代理请求分页数据集合
- public ActionResult Index(int pageIndex = 1)
- {
- var products = this.Service.GetProducts(PageSize, pageIndex);
- return View(products);
- }
- MVC附加用户Context信息到服务端
- protected override void OnActionExecuting(ActionExecutingContext filterContext)
- {
- base.OnActionExecuting(filterContext);
- WCFContext.Current.Operater = new Operater(){Name = "guozili",Time = DateTime.Now,IP = Fetch.UserIp,};
- }
- BLL取出Context信息并调用数据层
- public PagedList<Product> GetProducts(int pageSize, int pageIndex, int categoryId = 0)
- {
- //Test WCFContext
- var context = WCFContext.Current.Operater;
- return this.dao.FindAllByPage<Product, int>(p => categoryId == 0 ? true : p.CategoryId == categoryId, p => p.Id, pageSize, pageIndex);
- }
- DAL调用通用的Repository接口
- public PagedList<T> FindAllByPage<T, S>(Expression<Func<T, bool>> conditions, Expression<Func<T, S>> orderBy, int pageSize, int pageIndex) where T : class
- {
- var queryList = conditions == null ? context.Set<T>() : context.Set<T>().Where(conditions) as IQueryable<T>;
- return queryList.OrderByDescending(orderBy).ToPagedList(pageIndex, pageSize);
- }
6. 最后提供源码下
http://files.cnblogs.com/guozili/EasyEF.rar
原文链接：http://www.cnblogs.com/guozili/archive/2012/09/03/2667429.html
