c# - ASP.NET 5 EF7 代码优先迁移默认按字母顺序创建列

Question

我在本地计算机上遇到 EF7-codefirst 迁移和 SQL Server 的一些奇怪问题。当我在命令提示符下运行以下命令时:

dnx ef migrations add InitialDatabse

它按字母顺序创建列。据我所知，默认情况下通常是按照它们在类中的相同顺序创建列。

这是我的担忧:
为什么它按字母顺序创建我的列？

这是我的模型和 Dbcontext:

public class Customer
{
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTime CreatedDate { get; set; } = DateTime.Now;
    public string CreatedBy { get; set; }
    public DateTime? ModifiedDate { get; set; }
    public string ModifiedBy { get; set; }

    // Navigation properties
    public ICollection<Contact> Contacts { get; set; }
}

public class Contact
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Title { get; set; }
    public string Email { get; set; }
    public DateTime CreatedDate { get; set; } = DateTime.Now;
    public string CreatedBy { get; set; }
    public DateTime? ModifiedDate { get; set; }
    public string ModifiedBy { get; set; }
}

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext ()
    {
        Database.EnsureCreated();
    }

    public DbSet<Customer> Customers { get; set; }
    public DbSet<Contact> Contacts { get; set; }
}

这是我向项目添加迁移后的 InitialDatabase.cs 文件:

    migrationBuilder.CreateTable(
        name: "Customer",
        columns: table => new
        {
            Id = table.Column<int>(nullable: false)
                .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
            CreatedBy = table.Column<string>(nullable: true),
            CreatedDate = table.Column<DateTime>(nullable: false),
            ModifiedBy = table.Column<string>(nullable: true),
            ModifiedDate = table.Column<DateTime>(nullable: true),
            Name = table.Column<string>(nullable: true)
        },
        constraints: table =>
        {
            table.PrimaryKey("PK_Customer", x => x.Id);
        });
    migrationBuilder.CreateTable(
        name: "Contact",
        columns: table => new
        {
            Id = table.Column<int>(nullable: false)
                .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
            CreatedBy = table.Column<string>(nullable: true),
            CreatedDate = table.Column<DateTime>(nullable: false),
            CustomerId = table.Column<int>(nullable: true),
            Email = table.Column<string>(nullable: true),
            FirstName = table.Column<string>(nullable: true),
            LastName = table.Column<string>(nullable: true),
            ModifiedBy = table.Column<string>(nullable: true),
            ModifiedDate = table.Column<DateTime>(nullable: true),
            Title = table.Column<string>(nullable: true)
        },
        constraints: table =>
        {
            table.PrimaryKey("PK_Contact", x => x.Id);
            table.ForeignKey(
                name: "FK_Contact_Customer_CustomerId",
                column: x => x.CustomerId,
                principalTable: "Customer",
                principalColumn: "Id",
                onDelete: ReferentialAction.Restrict);
        });

Answer 1

很难确保可预测的顺序，因此目前未实现按属性排序。 请参阅此处的讨论 https://github.com/aspnet/EntityFramework/issues/2272