帶有構造函數調用的EF Core 2.1.1種子方法

Question

為什么在種子類的構造函數中設置的屬性等於0？ 我有自己的種子方法：

    public static void Seed(this ModelBuilder modelBuilder)
    {
        Random random = new Random();
        int range = 20; // for doubles

        int countOfWorkers = 10;

        modelBuilder.Entity<Farm>().HasData(Farm.GetFarm());

        for (int i = 0; i < countOfWorkers; i++)
        {
            modelBuilder.Entity<Driver>().HasData(
            new Driver
            {
                // i belive that constructor launch in here
                Id = i + 1,
                FarmId = 1,
                FirstName = "name" + i,
                LastName = "lastname" + i,
                UsdPerHour = Math.Round((random.NextDouble() * 20), 2),
                HoursPerDay = random.Next(1, 23),
                DaysOfWork = random.Next(1, 31)
            });
        }
    }

Driver類具有一個構造函數：

public class Driver : Worker
{
    // constructor
    public Driver() => BaseSalary = CountBaseSalary();

    public override double BaseSalary { get; set; }

    //this propertys like UsdPerHours are in my abstract 'Worker' class
    public override double CountBaseSalary() => UsdPerHour* HoursPerDay *DaysOfWork;

}

該值基於Seed的屬性（例如UsdPerHour ， DaysOfWork等）設置BaseSalary值。

從上面的代碼中，我在數據庫中的BaseSalary屬性設置為“ 0”，所有行

我的問題是，當我開始播種數據時，構造函數中的CountBaseSalary方法CountBaseSalary被調用？ 是否可以在此方法所需的行之后以某種方式運行方法CountBaseSalary ？ 在哪里鑄造我的方法以獲得我想要的價值？

Answer 1

對於Class ，在Properties initialize之前調用Constructor Properties initialize 。 因此，應避免基於其他屬性從Constructor設置屬性值。

嘗試

for (int i = 0; i < countOfWorkers; i++)
{
    var driver = new Driver
    {
        // i belive that constructor launch in here
        Id = i + 1,
        FirstName = "name" + i,
        LastName = "lastname" + i,
        UsdPerHour = Math.Round((random.NextDouble() * 20), 2),
        HoursPerDay = random.Next(1, 23),
        DaysOfWork = random.Next(1, 31)
    };
    driver.BaseSalary = driver.CountBaseSalary();
    modelBuilder.Entity<Driver>().HasData(driver);
}