问使用急切加载的存储库通用方法GetById

EN

public virtual TEntity GetById(object id, params string[] includeProperties)
{
    var propertyName = ((System.Data.Entity.Infrastructure.IObjectContextAdapter)DbContext).ObjectContext
        .CreateObjectSet<TEntity>().EntitySet.ElementType.KeyMembers.Single().Name;

    var parameter = Expression.Parameter(typeof(TEntity), "e");
    var predicate = Expression.Lambda<Func<TEntity, bool>>(
        Expression.Equal(
            Expression.PropertyOrField(parameter, propertyName),
            Expression.Constant(id)),
        parameter);

    var query = DbSet.AsQueryable();
    if (includeProperties != null && includeProperties.Length > 0)
        query = includeProperties.Aggregate(query, System.Data.Entity.QueryableExtensions.Include);
    return query.FirstOrDefault(predicate);
}

public virtual T Get(object id)
{
        var propertyName = "AddressId";

        //get all navigation properties defined for entity
        var navigationProps = _context.Model.FindEntityType(typeof(T)).GetNavigations();

        //turn those navigation properties into a string array
        var includeProperties = navigationProps.Select(p => p.PropertyInfo.Name).ToArray();

        //make parameter of type T
        var parameter = Expression.Parameter(typeof(T), "e");

        //create the lambda expression
        var predicateLeft = Expression.PropertyOrField(parameter, propertyName);
        var predicateRight = Expression.Constant(id);
        var predicate = Expression.Lambda<Func<T, bool>>(Expression.Equal(predicateLeft, predicateRight), parameter);

        //get queryable
        var query = _context.Set<T>().AsQueryable();

        //apply Include method to the query multiple times
        query = includeProperties.Aggregate(query, Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.Include);

        //return first item in query
        return query.FirstOrDefault(predicate);
}

public IQueryable<T> FindByCondition(Expression<Func<T, bool>> expression)
    {
        return this.RepositoryContext.Set<T>().Where(expression).AsNoTracking();
    }

var User =  _IRepositoryWrapper.User.FindByCondition(x=>x.Id == id).Include(a=>a.Photos).FirstOrDefault();