EF Core - FromSql 在参数化数字集合时抛出无效数字

Question

我正在使用 Entity Framework Core 并尝试将整数集合转换为字符串，然后将字符串作为参数传递给 FromSql 函数。

这是我的问题的简化示例：

IQueryable<Equipment> query = _context.Set<Equipment>();

const string s = "150999, 720045, 720046";

IQueryable<SignalGantryEquipment> filteredSignalGantryEquipments 
                = query.FromSql("select id, name from equipment " +
                                "where id in ({0}) and type = {1} " + 
                                "order by name", s, equipmentId)
                    .Select(x => new Equipment
                    {
                        Id = x.Id,
                        Name = x.Name
                    });

return filteredSignalGantryEquipments;

我希望上面的代码可以工作。但是，我收到以下错误：

问题是 100% 与参数化字符串 s 相关，因为我已经测试了 equipmentId。

我发现很奇怪的是，如果我删除字符串 s 作为参数并将值硬编码到位，它会按预期工作而没有错误。

IQueryable<SignalGantryEquipment> filteredSignalGantryEquipments 
                = query.FromSql("select id, name from signal_gantry_equipment " +
                                "where id in (150999, 720045, 720046) and equipment_type = {0} " + 
                                "order by name", equipmentId)
                    .Select(x => new SignalGantryEquipment
                    {
                        Id = x.Id,
                        Name = x.Name
                    });

为什么会这样，如何将整数集合作为参数？

Answer 1

问题是形成的查询将如下所示。请注意，您尝试作为一组传递的内容实际上只是一个字符串，Oracle DB 提供程序在其中期望一组数字（我假设 ints）。

select id, name from equipment where id in ('150999, 720045, 720046')...

如果您不介意使用完整的 Linq，这里有一个选项：

var idList = new List<int>(){ 150999, 720045, 720046 };

// making some guesses on property names below
// also - is it correct to be comparing equipment type to variable named equipmentId?

return _context.Set<Equipment>()
   .Where(e => idList.Contains(e.Id) && e.EquipmentType == equipmentId)
   .ToList();