[英]Generic Repository Includes and Filtering
我創建了一個通用存儲庫。 目前,我有一個StaffRepository,它繼承自我的通用資源庫(資源庫)。 這很好用,因為我的通用存儲庫具有我的CRUD操作,並允許我在我的服務以及StaffRepository中的方法中使用它們,它們對上下文進行附加過濾並添加包含內容。 但是,我需要為每個實體創建一個存儲庫(通過ClientId和主鍵進行的大多數過濾)。 有沒有辦法我可以使用通用方法來過濾和應用包含? 我也在這里采用正確的方法嗎? 謝謝你的幫助。
示例StaffRepository:
public class StaffRepository : Repository<Staff>
{
public StaffRepository(ApplicationDbContext _context) : base(_context)
{
}
public async Task<List<Staff>> GetAsync(int clientId)
{
return await _context.Staff
.Include(s => s.Person)
.Include(u => u.Person.User)
.Include(p => p.Photograph)
.Where(x => x.ClientId == clientId)
.ToListAsync();
}
public async Task<Staff> GetByIdAsync(int clientId, int staffId)
{
return await _context.Staff
.Include(s => s.Person)
.Include(u => u.Person.User)
.FirstOrDefaultAsync(x => x.ClientId == clientId && x.StaffId == staffId);
}
}
我的通用存儲庫:
public class Repository<T> : IRepository<T> where T : class, new()
{
internal readonly ApplicationDbContext _context;
public Repository(ApplicationDbContext context)
{
this._context = context;
}
public async Task<T> FindAsync(int id)
{
return await _context.Set<T>().FindAsync(id);
}
public async Task InsertAsync(T entity)
{
await _context.Set<T>().AddAsync(entity);
await SaveAsync();
}
public async Task AddRangeAsync(IEnumerable<T> entities)
{
await _context.Set<T>().AddRangeAsync(entities);
await SaveAsync();
}
public async Task UpdateAsync(T entity)
{
_context.Set<T>().Attach(entity);
_context.Entry(entity).State = EntityState.Modified;
await SaveAsync();
}
public async Task DeleteAsync(T entity)
{
if (_context.Entry(entity).State == EntityState.Detached)
_context.Set<T>().Attach(entity);
_context.Set<T>().Remove(entity);
await SaveAsync();
}
public async Task SaveAsync()
{
await _context.SaveChangesAsync();
}
}
您需要做的就是使用類似下面的GetAsync方法中所示的表達式:
public class GenericRepository<TEntity> where TEntity : class
{
internal DbContext dbContext;
internal DbSet<TEntity> dbSet;
public GenericRepository(DbContext context)
{
this.dbContext = context;
this.dbSet = context.Set<TEntity>();
}
public virtual async Task<IEnumerable<TEntity>> GetAsync(
Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "",
int first = 0, int offset = 0)
{
IQueryable<TEntity> query = dbSet;
if (filter != null)
{
query = query.Where(filter);
}
if (offset > 0)
{
query = query.Skip(offset);
}
if (first > 0)
{
query = query.Take(first);
}
foreach (var includeProperty in includeProperties.Split
(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
{
query = query.Include(includeProperty);
}
if (orderBy != null)
{
return await orderBy(query).ToListAsync();
}
else
{
return await query.ToListAsync();
}
}
}
我剛剛將存儲庫包含在GetAsync方法中,並且我建議您使用UnityOfWork模式,這樣就可以將該存儲庫的實例(針對每個實體)放在集中的位置,例如:
public class UnitOfWork : IDisposable
{
private GenericRepository<YourEntity> yourRepository;
private DbContext context;
public UnitOfWork(DbContext context)
{
this.context = context;
}
public GenericRepository<YourEntity> YourRepository
{
get
{
if (this.yourRepository== null)
{
this.yourRepository= new GenericRepository<YourEntity>(context);
}
return yourRepository;
}
}
}
然后,這只是一個實例化此示例的示例:
await unitOfWork.YourRepository.GetAsync(filter: w => w.OtherKeyNavigation.Id == 123456, includeProperties: "OtherKeyNavigation", first: 20, offset: 0);
注意:我不包括存儲庫和UnityOfWork中的所有代碼,因為這不是此問題的一部分。 謝謝
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.