分享基于EF+WCF的通用三层架构及解析
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 Code1 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. 数据层基于Entity Framwork code First:
- DBContext
View Code1 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
View Code1 [Table("Product")]
2 public partial class Product
3 {
4 public int Id { get; set; }
5
6 [StringLength(50)]
7 [Required(ErrorMessage = "名称不能为空")]
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
1 public ActionResult Index(int pageIndex = 1)
2 {
3 var products = this.Service.GetProducts(PageSize, pageIndex);
4 return View(products);
5 }- MVC附加用户Context信息到服务端
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信息并调用数据层
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调用通用的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. 最后提供源码下载https://files.cnblogs.com/guozili/EasyEF.rar