c# - 然后包含在EF Core查询中无法识别

我的IQueryable看起来像这样:

 IQueryable<TEntity> query = context.Set<TEntity>();
query = query.Include("Car").ThenInclude("Model");

我需要所有引用资料:

using Content.Data.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

为什么它不识别ThenInclude？

询问:

[Content.Data.Models.Article]).Where(x => (((x.BaseContentItem.SiteId == value(Content.Business.Managers.ArticleManager+<>c__DisplayClass8_0).id) AndAlso x.BaseContentItem.IsActive) AndAlso x.BaseContentItem.IsLive)).Include("BaseContentItem").Include("BaseContentItem.TopicTag").Include("MainImage")}

我加入.Include("BaseContentItem.TopicTag")部分后失败。

因此，我刚刚读到，使用通用存储库会丢失ThenInclude。我正在使用thise通用代表:

public class ReadOnlyRepository<TContext> : IReadOnlyRepository
            where TContext : DbContext
    {
        protected readonly TContext context;

        public ReadOnlyRepository(TContext context)
        {
            this.context = context;
        }

        private IQueryable<TEntity> GetQueryable<TEntity>(
            Expression<Func<TEntity, bool>> filter = null,
            Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
            string includeProperties = null,
            int? skip = null,
            int? take = null)
            where TEntity : class, IEntity
        {
            includeProperties = includeProperties ?? string.Empty;
            IQueryable<TEntity> query = context.Set<TEntity>();

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

            foreach (var includeProperty in includeProperties.Split
                (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
            {
                query = query.Include(includeProperty);
            }

            if (orderBy != null)
            {
                query = orderBy(query);
            }

            if (skip.HasValue)
            {
                query = query.Skip(skip.Value);
            }

            if (take.HasValue)
            {
                query = query.Take(take.Value);
            }

            return query;
        }

最佳答案

仅当对lambda表达式参数使用ThenInclude重载时，Include才可用:

query = query.Include(e => e.Car).ThenInclude(e => e.Model);

当您将Include重载与字符串参数一起使用时，由于您可以在传递的字符串中指定整个属性路径，因此不需要ThenInclude:

query = query.Include("Car.Model");