Question

我想添加带外键的记录，以免写入数字ID。

    protected override void Seed(ClockShopEntities context)
    { ... } // Seed

    private void AddType(ClockShopEntities context)
    {
        context.Typs.Add(new Typ { typName = "name1" });
        context.Typs.Add(new Typ { typName = "name2" });
    } // AddType

    private void AddCountry(ClockShopEntities context)
    {
        context.Countries.Add(new Country { countryName = "country1" });
        context.Countries.Add(new Country { countryName = "country2" });
        context.Countries.Add(new Country { countryName = "country3" });
        context.Countries.Add(new Country { countryName = "country4" });
    } // AddCountry

如何通过指定名称来添加值？

    // !!!!! with write id
    private void AddFabricator(ClockShopEntities context)
    {
        context.Fabricators.Add(new Fabricator { fName = "", idCountry = 1 });
    } // AddFabricator


    // How can I write without Id
    private void AddFabricator(ClockShopEntities context)
    {
        context.Fabricators.Add(
          new Fabricator { fName = "", idCountry = ?? where Country = "country1" });
    } // AddFabricator

我希望得到帮助，艾玛

Answer 1

由于Id尚未插入数据库，因此目前无法按Country添加。您需要做的是设置{{1 Country的属性被插入的新Fabricator，当Country插入数据库时，实体框架本身会在CountryId上设置Fabricator

下面的代码应该会给你一些想法：

Fabricator

或者，您也可以按名称获取当地国家/地区（尚未添加），并将其分配给private void AddCountry(ClockShopEntities context) { var country1 = new Country { countryName = "country1" }; AddFabricator(context, country1); context.Countries.Add(country1); context.Countries.Add(new Country { countryName = "country2" }); context.Countries.Add(new Country { countryName = "country3" }); context.Countries.Add(new Country { countryName = "country4" }); } // AddCountry private void AddFabricator(ClockShopEntities context, Country country) { context.Fabricators.Add(new Fabricator { fName = "", Country = country }); } // AddFabricator的{{1}}媒体资源。

Country

使用外键实体框架在方法Seed中添加记录

1 个答案: