Question

我不断收到通知“ApplicationDbContext有待更改的模型更改”。正在生成的迁移只会丢弃一堆外键，然后重新创建它们。以下是我没有进行数据库更改但发出此消息的示例：

    public partial class MysteryMigration : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropForeignKey(name: "FK_IdentityRoleClaim<string>_IdentityRole_RoleId", table: "AspNetRoleClaims");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserClaim<string>_User_UserId", table: "AspNetUserClaims");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserLogin<string>_User_UserId", table: "AspNetUserLogins");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserRole<string>_IdentityRole_RoleId", table: "AspNetUserRoles");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserRole<string>_User_UserId", table: "AspNetUserRoles");
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityRoleClaim<string>_IdentityRole_RoleId",
            table: "AspNetRoleClaims",
            column: "RoleId",
            principalTable: "AspNetRoles",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserClaim<string>_User_UserId",
            table: "AspNetUserClaims",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserLogin<string>_User_UserId",
            table: "AspNetUserLogins",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserRole<string>_IdentityRole_RoleId",
            table: "AspNetUserRoles",
            column: "RoleId",
            principalTable: "AspNetRoles",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserRole<string>_User_UserId",
            table: "AspNetUserRoles",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropForeignKey(name: "FK_IdentityRoleClaim<string>_IdentityRole_RoleId", table: "AspNetRoleClaims");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserClaim<string>_User_UserId", table: "AspNetUserClaims");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserLogin<string>_User_UserId", table: "AspNetUserLogins");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserRole<string>_IdentityRole_RoleId", table: "AspNetUserRoles");
        migrationBuilder.DropForeignKey(name: "FK_IdentityUserRole<string>_User_UserId", table: "AspNetUserRoles");
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityRoleClaim<string>_IdentityRole_RoleId",
            table: "AspNetRoleClaims",
            column: "RoleId",
            principalTable: "AspNetRoles",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserClaim<string>_User_UserId",
            table: "AspNetUserClaims",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserLogin<string>_User_UserId",
            table: "AspNetUserLogins",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserRole<string>_IdentityRole_RoleId",
            table: "AspNetUserRoles",
            column: "RoleId",
            principalTable: "AspNetRoles",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
        migrationBuilder.AddForeignKey(
            name: "FK_IdentityUserRole<string>_User_UserId",
            table: "AspNetUserRoles",
            column: "UserId",
            principalTable: "AspNetUsers",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
    }
}

即使我有需要运行的合法迁移，这些外键也会被删除+重新创建。我正在使用Microsoft.AspNet.Identity.EntityFramework 3.0.0-rc1-final。

任何人都有任何想法为什么会发生这种情况，以及我如何能够结束它？

Answer 1

道歉，按照惯例，我在发布此内容后搜索的下一件事就出现了答案！

这里有重复的问题："ef migrations add" always recreates foreign keys in the new migration

基本上它是RC1问题，将在即将推出的RC2中修复

EF7 Code First不断删除和重新创建外键

1 个答案: