c# – Linq之间的表现

var listFields = from b in unitOfWork.PropiedadRepository.Get()
                         where b.Entidad.Nombre == "Empresa"
                         select b;
var listFields2 = unitOfWork.PropiedadRepository.Get().Where(x => x.Entidad.Nombre == "Empresa");
var listFields3 = unitOfWork.PropiedadRepository.Get(x => x.Entidad.Nombre == "Empresa");

这是GenericRepository类.所有的存储库都继承了它.

public sealed class GenericRepository<TEntity> where TEntity : class
{
    private readonly ConfigurationDbDataContext _context;
    private readonly DbSet<TEntity> _dbSet;

    public GenericRepository(ConfigurationDbDataContext context)
    {
        _context = context;
        _dbSet = context.Set<TEntity>();
    }

    public IEnumerable<TEntity> Get(
        Expression<Func<TEntity,bool>> filter = null,Func<IQueryable<TEntity>,IOrderedQueryable<TEntity>> orderBy = null,string includeProperties = "")
    {
        IQueryable<TEntity> query = _dbSet;

        if (filter != null)
        {
            query = query.Where(filter);
        }

        query = includeProperties.Split(new[] {','},StringSplitOptions.RemoveEmptyEntries).Aggregate(query,(current,includeProperty) => current.Include(includeProperty));

        // ReSharper disable once ConvertIfStatementToReturnStatement
        if (orderBy != null)
        {
            return orderBy(query).ToList();
        }
        else
        {
            return query.ToList();
        }
    }

    public TEntity GetById(object id)
    {
        return _dbSet.Find(id);
    }

    public void Insert(TEntity entity)
    {
        _dbSet.Add(entity);
    }

    public void Delete(object id)
    {
        var entityToDelete = _dbSet.Find(id);
        Delete(entityToDelete);
    }

    public void Delete(TEntity entityToDelete)
    {
        if (_context.Entry(entityToDelete).State == EntityState.Detached)
        {
            _dbSet.Attach(entityToDelete);
        }
        _dbSet.Remove(entityToDelete);
    }

    public void Update(TEntity entityToUpdate)
    {
        _dbSet.Attach(entityToUpdate);
        _context.Entry(entityToUpdate).State = EntityState.Modified;
    }
}