实体框架代码首先播种数据

Question

我在实体框架中使用代码第一种方法，但我无法将默认数据播种到表中。请帮忙。

模型

public class Employee 
    { 
     public int Id { get; set; } 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 
     public string Gender { get; set; } 
     public int Salary { get; set; } 


     public virtual Department Departments { get; set; } 

    } 
public class Department 
    { 
     public int Id { get; set; } 
     public string Name { get; set; } 
     public string Location { get; set; } 
     public virtual ICollection<Employee> Employees { get; set; } 

     public Department() 
     { 
      this.Employees = new List<Employee>(); 
     } 

    } 

初始化程序

public class DepartmentInitializer : DropCreateDatabaseIfModelChanges<EmployeeDBContext> 
    { 
     protected override void Seed(EmployeeDBContext context) 
     { 
      IList<Department> lst = new List<Department> 
      { 
       new Department 
       { 
        Name = "Developer", 
        Location = "Bangalore" 
       }, 
       new Department 
       { 
        Name = "Tester", 
        Location = "Bangalore" 
       }, 
       new Department 
       { 
        Name = "IT Services", 
        Location = "Chennai" 
       } 
      }; 
      foreach (var item in lst) 
      { 
       context.Departments.Add(item); 
      } 
      context.SaveChanges(); 
     } 
    } 

主要应用

class Program 
    { 
     static void Main(string[] args) 
     { 
      using (var db = new EmployeeDBContext()) 
      { 
       Database.SetInitializer<EmployeeDBContext>(new DepartmentInitializer()); 
      } 
     } 
    } 

Answer 1

对于实体框架6版，采用“迁移”是如本教程版本的首选方式的数据库，使用“Configuration.Seed”的方法：

http://www.asp.net/web-api/overview/data/using-web-api-with-entity-framework/part-3

您是否尝试从软件包管理器控制台运行“Update-Database”以使其运行？

我知道我在使用EF6的老式播种方法时遇到了问题。实体框架Core 1（以前称为EF7）的迁移也发生了变化，因此请确保将正确的技术应用于正确的版本。

Answer 2

尝试实际上查询您的分贝

在我的机器，播种机运行时，我查询它第一个ti我。

using (var db = new EmployeeDBContext()) 
{ 
    Database.SetInitializer<EmployeeDBContext>(new DepartmentInitializer()); 
    var depts = db.Departments.ToList(); 
}