如何在asp.net core 1.0中添加迁移

Question

我在创建迁移时遇到了问题,当我在Package中创建Migration时,不会创建迁移

DbInitializer

public static class DbInitializer
{
    public static void Initialize(SchoolContext context)
    {
        context.Database.EnsureCreated();

        // Look for any students.
        if (context.Students.Any())
        {
            return;   // DB has been seeded
        }

        var students = new Student[]
        {
        new Student{FirstMidName="Carson",LastName="Alexander",EnrollmentDate=DateTime.Parse("2005-09-01")},
        new Student{FirstMidName="Meredith",LastName="Alonso",EnrollmentDate=DateTime.Parse("2002-09-01")},
        new Student{FirstMidName="Arturo",LastName="Anand",EnrollmentDate=DateTime.Parse("2003-09-01")},
        new Student{FirstMidName="Gytis",LastName="Barzdukas",EnrollmentDate=DateTime.Parse("2002-09-01")},
        new Student{FirstMidName="Yan",LastName="Li",EnrollmentDate=DateTime.Parse("2002-09-01")},
        new Student{FirstMidName="Peggy",LastName="Justice",EnrollmentDate=DateTime.Parse("2001-09-01")},
        new Student{FirstMidName="Laura",LastName="Norman",EnrollmentDate=DateTime.Parse("2003-09-01")},
        new Student{FirstMidName="Nino",LastName="Olivetto",EnrollmentDate=DateTime.Parse("2005-09-01")}
        };
        foreach (Student s in students)
        {
            context.Students.Add(s);
        }
        context.SaveChanges();

    }
}

MadeChanges在Startup.cs中

app.UseMvc(routes =>
{
    routes.MapRoute(
        name: "default",
        template: "{controller=Home}/{action=Index}/{id?}");
});
DbInitializer.Initialize(conetxt);

软件包管理器consol> Add-Migration FirstMigration和完成后更新 - 数据库

Update-Database命令中出现问题

Answer 1

使用EF Core,您现在拥有2个不同的命令行工具,即dotnet cli和PM控制台.您可以查看官方文档以供进一步参考.

使用dotnet时,可以使用以下命令添加迁移:

用法:dotnet ef migrations [options] [command]

选项:

• -h | --help =>显示帮助信息
• -v | --verbose =>启用详细输出

命令:

• add =>添加新迁移
• list =>列出迁移
• remove =>删除上次迁移
• script =>从迁移生成SQL脚本

因此,为了添加新的FirstMigration迁移,您将运行:

>dotnet ef migrations add FirstMigration

程序包管理器控制台也可以使用相同的命令:

• 如果使用Visual Studio 2017,则应已安装它们
• 如果您使用Visual Studio 2017,则需要安装它们Install-Package Microsoft.EntityFrameworkCore.Tools -Pre.(查看有关在文档中并排安装EF Core和EF6命令的部分)

为了添加迁移,您将运行:

>Add-Migration FirstMigration