實體框架4 CTP 4 / CTP 5通用存儲庫模式和單元可測試我正在玩最新的Entity Framework CTP 5版本并構建一個簡單的asp.net MVC博客，其中我只有兩個表：Post和Comments。這完全是在POCO中完成的，我只需要DbContext部分的幫助，我需要它可以進行單元測試（使用IDbSet？），我需要一個簡單/通用的存儲庫模式來添加，更新，刪除，檢索。任何幫助表示贊賞。
3 回答
冉冉說
TA貢獻1877條經驗 獲得超1個贊
從DbContext開始，創(chuàng)建一個名為Database.cs的新文件：
Database.cs
public class Database : DbContext
{
private IDbSet<Post> _posts;
public IDbSet<Post> Posts {
get { return _posts ?? (_posts = DbSet<Post>()); }
}
public virtual IDbSet<T> DbSet<T>() where T : class {
return Set<T>();
}
public virtual void Commit() {
base.SaveChanges();
}}定義IDatabaseFactory并使用DatabaseFactory實現(xiàn)它：
IDatabaseFactory.cs
public interface IDatabaseFactory : IDisposable
{
Database Get();
}DatabaseFactory.cs
public class DatabaseFactory : Disposable, IDatabaseFactory {
private Database _database;
public Database Get() {
return _database ?? (_database = new Database());
}
protected override void DisposeCore() {
if (_database != null)
_database.Dispose();
}
}一次性擴展方法：
Disposable.cs
public class Disposable : IDisposable
{
private bool isDisposed;
~Disposable()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if(!isDisposed && disposing)
{
DisposeCore();
}
isDisposed = true;
}
protected virtual void DisposeCore()
{
}
}現(xiàn)在我們可以定義我們的IRepository和RepositoryBase
IRepository.cs
public interface IRepository<T> where T : class{
void Add(T entity);
void Delete(T entity);
void Update(T entity);
T GetById(long Id);
IEnumerable<T> All();
IEnumerable<T> AllReadOnly();}RepositoryBase.cs
public abstract class RepositoryBase<T> where T : class
{
private Database _database;
private readonly IDbSet<T> _dbset;
protected RepositoryBase(IDatabaseFactory databaseFactory)
{
DatabaseFactory = databaseFactory;
_dbset = Database.Set<T>();
}
protected IDatabaseFactory DatabaseFactory
{
get; private set;
}
protected Database Database
{
get { return _database ?? (_database = DatabaseFactory.Get()); }
}
public virtual void Add(T entity)
{
_dbset.Add(entity);
}
public virtual void Delete(T entity)
{
_dbset.Remove(entity);
}
public virtual void Update(T entity)
{
_database.Entry(entity).State = EntityState.Modified;
}
public virtual T GetById(long id)
{
return _dbset.Find(id);
}
public virtual IEnumerable<T> All()
{
return _dbset.ToList();
}
public virtual IEnumerable<T> AllReadOnly()
{
return _dbset.AsNoTracking().ToList();
}
}現(xiàn)在您可以創(chuàng)建IPostRepository和PostRepository：
IPostRepository.cs
public interface IPostRepository : IRepository<Post>
{
//Add custom methods here if needed
Post ByTitle(string title);
}PostRepository.cs
public class PostRepository : RepositoryBase<Post>, IPostRepository
{
public PostRepository(IDatabaseFactory databaseFactory) : base(databaseFactory)
{
}
public Post ByTitle(string title) {
return base.Database.Posts.Single(x => x.Title == title);
}
}最后，UoW：
IUnitOfWork.cs
public interface IUnitOfWork{
void Commit();}UnitOfWork.cs
private readonly IDatabaseFactory _databaseFactory;private Database _database;public UnitOfWork(IDatabaseFactory databaseFactory){
_databaseFactory = databaseFactory;}protected Database Database{
get { return _database ?? (_database = _databaseFactory.Get()); }}public void Commit(){
Database.Commit();}在您的控制器中使用：
private readonly IPostRepository _postRepository;private readonly IUnitOfWork_unitOfWork;
public PostController(IPostRepository postRepository, IUnitOfWork unitOfWork)
{
_postRepository = postRepository;
_unitOfWork = unitOfWork;
}
public ActionResult Add(Post post) {
_postRepository.Add(post);
_unitOfWork.Commit();
}您需要使用像StructureMap這樣的IoC容器來完成這項工作。您可以通過NuGet安裝結構圖，或者如果您使用的是MVC 3，則可以安裝StructureMap-MVC NuGet包。（以下鏈接）
Install-Package StructureMap.MVC3
如果您有任何疑問，請告訴我。希望能幫助到你。
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