使用FromSql和include时出错（“调用存储过程时不支持包含操作。”）

Question

我使用Asp.Net Core版本2和代码优先。我试图使用.FromSql来调用存储过程。我跟微软说的一样：

var blogs = context.Blogs
                   .FromSql($"SELECT * FROM dbo.SearchBlogs({searchTerm})")
                   .Include(b => b.Posts)
                   .ToList();

我的存储过程只包含代码行

 ALTER PROCEDURE [dbo].[GetCouffierSearch]  
 AS
 BEGIN
     SET NOCOUNT ON;

     SELECT * 
     FROM AspNetUsers
END

我在API中的代码：

public IQueryable<ApplicationUser> SelectNearByUser()
{
    var query = "execute dbo.GetCouffierSearch";
    var res = _context.Users.FromSql(query);
    return res.Include(x => x.CoiffeurServiceLevels);
}

和我的班级ApplicationUser包含CoiffeurServiceLevels类型为ICollection的定义：

public class ApplicationUser: IdentityUser
{
        public ApplicationUser()
        {         
            //CoiffeurServiceLevels = new Collection<CoiffeurServiceLevel>();
            //Requests = new Collection<Request>();
            //Tickets = new Collection<Ticket>();        
            //UserRatings = new Collection<Rating>();
            //CouffierRatings = new Collection<Rating>();
        }

        public string PhotoUrl { get; set; }

        public string Lat { get; set; }
        public Language Language { get; set; }

        public string Address { get; set; }
        public string FullName { get; set; }
        public string Lng { get; set; }
        public string PersonalId { get; set; }

        public Place Places { get; set; }
        public long? PlaceId { get; set; }

        public int? CouffierNumber { get; set; } = 1;

        public long CityId { get; set; }
        public City City { get; set; }

        public bool IsSuspended { get; set; }
        public bool IsOnline { get; set; }
        public string ConfirmedToken { get; set; }
        public string ResetPasswordlToken { get; set; }
        public  DateTime BirthDate { get; set; }

        public bool Gender { get; set; } 

        //#region RelationsClass

        public virtual ICollection<CoiffeurServiceLevel> CoiffeurServiceLevels { get; set; }
        // public ICollection<Request> Requests { get; set; }
        ////public ICollection<Request> RequestsCouffier { get; set; }
        //public virtual ICollection<Ticket> Tickets { get; set; }
        public virtual ICollection<Rating> UserRatings { get; set; }
        //public virtual ICollection<Rating> UserRatingsBy { get; set; }
        //public ICollection<IdentityRole> Roles { get; set; }

        //Roles = new Collection<IdentityUserRole>();
        //#endregion
}

当我调用它时，我收到此错误：

消息：调用存储过程时不支持包含操作。 来源：Microsoft.EntityFrameworkCore.Relational

Answer 1

我有同样的问题，并且发现如果你单独加载两个实体，只要数据模型支持这个，它们就会自动链接在一起。

我通过具有陈列室ID的存储过程加载了客户实体，我想从陈列室表中显示陈列室的名称：

首先我填充展厅：

Showroom = await _context.Showroom.ToListAsync();

然后我为客户对象调用我的存储过程：

Customer = await _context.Customer
            .FromSql("EXEC sp_GetCustomerList @SearchString, @SortString", searchParam, sortParam)
            .ToListAsync();

最后，我现在可以使用以下语法访问showrooms列表中的值：

@Html.DisplayFor(modelItem => item.Showroom.ShowroomName)

我不确定这样做是否会产生很大的性能影响，因为您实际上是在执行两个查询而不是一个查询。

Answer 2

您可以通过DbContext.Entry（...）API显式加载导航属性。 https://docs.microsoft.com/en-us/ef/core/querying/related-data#explicit-loading

public IQueryable<ApplicationUser> SelectNearByUser()
{
    var query = "execute dbo.GetCouffierSearch";
    var res = _context.Users.FromSql(query);
    _context.Entry(res)
            .Collection(x => x.CoiffeurServiceLevels)
            .Load();
    return res;
}

Answer 3

我使用了Ado.net和呼叫程序

DataTable dt = new DataTable();
            using (SqlConnection sqlConn = new SqlConnection(_context.Database.GetDbConnection().ConnectionString))
            {
                string sql = "<ProcedureName>";
                using (SqlCommand sqlCmd = new SqlCommand(sql, sqlConn))
                {
                    sqlCmd.CommandType = CommandType.StoredProcedure;
                    sqlCmd.Parameters.AddWithValue("@ServiceId", string.Join(',', servicesIds.ToArray()));

                    sqlCmd.Parameters.AddWithValue("@Page", page);
                    sqlCmd.Parameters.AddWithValue("@PageSize", pageSize);
                    sqlConn.Open();
                    using (SqlDataAdapter sqlAdapter = new SqlDataAdapter(sqlCmd))
                    {
                        sqlAdapter.Fill(dt);
                    }
                }
            }