c# - EntityFramework通用存储库，包含多个？

我正在尝试从通用存储库更改通用检索方法。但我想改为为includeproperties传递一个字符串，以传递此字符串：params Expression<Func<TEntity, object>>[] includeProperties = null
问题是当我调用此方法时：

public virtual IEnumerable<TEntity> Retrieve(Expression<Func<TEntity, bool>> filter = null, params Expression<Func<TEntity, object>>[] includeProperties = null)

我想要例如：TEntityExample.Retrieve(filter: c=>c.Id=Id, includeProperties:c=> c.propertynav1, e=> e.propertynav1.propertynav3, e=> e.Prop4)

或者只是不需要导航属性TEntityExample.Retrieve(filter: c=>c.Id=Id)

但是不知道为什么includeProperties:不起作用，不被接受，任何人都不知道为什么或者我做错了什么。我希望不传递includeProperties或通过指定includeProperties:传递它的可能性

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

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

                if (!string.IsNullOrEmpty(includeProperties))
                {
                    foreach (var includeProperty in includeProperties.Split
                        (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
                    {
                        query = query.Include(includeProperty);
                    }
                }
                return query.ToList();
            }

最佳答案

我做类似的事情，但使用表达式来急切地加载。也许这会有所帮助：

    public TEntity Item(Expression<Func<TEntity, bool>> wherePredicate, params Expression<Func<TEntity, object>>[] includeProperties)
    {
        foreach (var property in includeProperties)
        {
            _dbSet.Include(property);
        }
        return _dbSet.Where(wherePredicate).FirstOrDefault();
    }