本項目結合EF 4.3及WCF實現了經典三層架構，各層面向接口，WCF實現SOA，Repository封裝調用，在此基礎上實現了WCFContext，動態服務調用及一個分頁的實例。
1. 項目架構圖：
2. 項目解決方案：
- 在傳統的三層架構上增加了WcfService（服務端），WcfClientProxy（客戶端服務調用），及WcfExtension（一些擴展）
3. Wcf Service的實現：
- 工廠實現了RemoteServiceFactory（用於遠程調用）和RefServiceFactory（本地引用調用服務層）生成客戶端代理，都需要實現IServiceFactory的“IService CreateService();”
- RemoteServiceFactory通過ChannelFactory動態產生客戶端代理類IService，並將此對象進行緩存
- WCFExtension實現了WCFContext，可傳輸用戶登陸或IP上下文信息，以及攔截方法寫Log的機制，具體可以參考 http://www.cnblogs.com/lovecindywang/archive/2012/03/01/2376144.html
3. 數據層Repository的實現：
- 通過用來訪問領域對象的一個類似集合的接口，在領域與數據映射層之間進行協調，將領域模型從客戶代碼和數據映射層之間解耦出來，具體實現代碼：
View Code
1 public class DaoBase : IRepository, IDisposable
2 {
3 public DbContext context;
4
5 public DaoBase()
6 {
7 this.context = new EasyEF.DAL.DbContext();
8 }
9
10 public T Update<T>(T entity) where T : class
11 {
12 var set = context.Set<T>();
13 set.Attach(entity);
14 context.Entry<T>(entity).State = EntityState.Modified;
15 context.SaveChanges();
16
17 return entity;
18 }
19
20 public T Insert<T>(T entity) where T : class
21 {
22 context.Set<T>().Add(entity);
23 context.SaveChanges();
24 return entity;
25 }
26
27 public void Delete<T>(T entity) where T : class
28 {
29 context.Entry<T>(entity).State = EntityState.Deleted;
30 context.SaveChanges();
31 }
32
33 public T Find<T>( params object[] keyValues) where T : class
34 {
35 return context.Set<T>().Find(keyValues);
36 }
37
38 public List<T> FindAll<T>(Expression<Func<T, bool>> conditions = null) where T : class
39 {
40 if (conditions == null)
41 return context.Set<T>().ToList();
42 else
43 return context.Set<T>().Where(conditions).ToList();
44 }
45
46 public PagedList<T> FindAllByPage<T, S>(Expression<Func<T, bool>> conditions, Expression<Func<T, S>> orderBy, int pageSize, int pageIndex) where T : class
47 {
48 var queryList = conditions == null ? context.Set<T>() : context.Set<T>().Where(conditions) as IQueryable<T>;
49
50 return queryList.OrderByDescending(orderBy).ToPagedList(pageIndex, pageSize);
51 }
52
53 public void Dispose()
54 {
55 this.context.Dispose();
56 }
4. 數據層基於Entity Framwork code First：
- DBContext
1 public class DbContext : System.Data.Entity.DbContext
2 {
3 public DbContext()
4 : base( " MyDbContext ")
5 {
6 this.Configuration.ProxyCreationEnabled = false;
7 }
8
9 public DbSet<Category> Categories { get; set; }
10 public DbSet<Product> Products { get; set; }
11 }- Model Mapping
1 [Table( " Product ")]
2 public partial class Product
3 {
4 public int Id { get; set; }
5
6 [StringLength( 50)]
7 [Required(ErrorMessage = " 名稱不能為空 ")]
8 public string Name { get; set; }
9
10 public int Size { get; set; }
11
12 [StringLength( 300)]
13 public string PhotoUrl { get; set; }
14
15 public DateTime AddTime { get; set; }
16
17 public int CategoryId { get; set; }
18 public virtual Category Category { get; set; }
19 }
5. 提供了MVC調用服務端分頁的實例：
- MVC調用Wcf客戶代理請求分頁數據集合
1 public ActionResult Index( int pageIndex = 1)
2 {
3 var products = this.Service.GetProducts(PageSize, pageIndex);
4 return View(products);
5 }- MVC附加用戶Context信息到服務端
1 protected override void OnActionExecuting(ActionExecutingContext filterContext)
2 {
3 base.OnActionExecuting(filterContext);
4 WCFContext.Current.Operater = new Operater(){Name = " guozili ",Time = DateTime.Now,IP = Fetch.UserIp,};
5 }- BLL取出Context信息並調用數據層
1 public PagedList<Product> GetProducts( int pageSize, int pageIndex, int categoryId = 0)
2 {
3 // Test WCFContext
4 var context = WCFContext.Current.Operater;
5 return this.dao.FindAllByPage<Product, int>(p => categoryId == 0 ? true : p.CategoryId == categoryId, p => p.Id, pageSize, pageIndex);
6 }- DAL調用通用的Repository接口
1 public PagedList<T> FindAllByPage<T, S>(Expression<Func<T, bool>> conditions, Expression<Func<T, S>> orderBy, int pageSize, int pageIndex) where T : class
2 {
3 var queryList = conditions == null ? context.Set<T>() : context.Set<T>().Where(conditions) as IQueryable<T>;
4
5 return queryList.OrderByDescending(orderBy).ToPagedList(pageIndex, pageSize);
6 }
6. 最后提供源碼下載http://files.cnblogs.com/guozili/EasyEF.rar