英文:

__EFMigrationsHistory remains empty even though the database is created

问题 {#heading}

I have translated the provided text:

嗨，我在EF Core 6中遇到了一个问题，即迁移的历史表仍然为空，但是当我检查SQL Server时，数据库已成功创建并且所有表也都创建了。
我使用了Code-First方法，所以我运行Add-Migration <name>来生成迁移。
当我运行Update-Database时，一切都正常运行。
我所做的是将EF Core从6.0.16升级到6.0.21，然后在我的模型中添加了一个新的实体mytablename，所以我生成了它的迁移。然后我运行Update-Database，现在它给了我这个错误：
Microsoft.Data.SqlClient.SqlException (0x80131904): 数据库中已存在一个名为'AspNetRoles'的对象。错误编号:2714，状态:6，类:16
mytablename已创建，但__EFMigrationsHistory未更新。
我尝试了一些解决方案，比如删除数据库并从头开始重新创建，然后尝试删除数据库和所有迁移并重新生成它们，但仍然没有解决问题，仍然出现相同的错误。
谢谢您帮助我，我是EF Core和DotNet产品的新手。

我尝试了一些解决方案，比如删除数据库并从头开始重新创建，然后尝试删除数据库和所有迁移并重新生成它们，但仍然没有解决问题，仍然出现相同的错误。
谢谢您帮助我，我是EF Core和DotNet产品的新手。
以下是第一个迁移：

public partial class CreateIdentitySchema : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.CreateTable(
            name: "AspNetRoles",
            columns: table => new
            {
                Id = table.Column<string>(nullable: false),
                Name = table.Column<string>(maxLength: 256, nullable: true),
                NormalizedName = table.Column<string>(maxLength: 256, nullable: true),
                ConcurrencyStamp = table.Column<string>(nullable: true)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_AspNetRoles", x => x.Id);
            });
    // 其他表的创建也在此处
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropTable(
name: "AspNetRoleClaims");
// 其他表的删除也在此处

}

}

当我手动填充__EFMigrationsHistory并运行update-database时，一切正常，但当我删除数据库并重新运行update-database时，会出现相同的错误。
当我运行dotnet ef migrations list时：

> 00000000000000_CreateIdentitySchema (待处理)
>
> 20230807142821_CreateAppDb (待处理)
>
> 20230809091829_AppTable (待处理)
>
> 20230809100343_UserPersonalData (待处理)
>
> 20230810084347_db (待处理)
>

>
> 程序：
>

public static class Program
{
    public static async Task Main(string[] args)
    {
        // 程序配置在此处
    }
}

>
> DbContext
>

public class ApplicationDbContext : 
    IdentityDbContext<ApplicationUser>
{
    // DbContext配置在此处
}

请注意，代码中的"应该是"，我已经做了修正。 英文:

Hi I have an issue with EF Core 6 that is the history table of migrations remains empty but when I check the sql server the db is created successfully with all the tables are created also.
I use Code-first approach so I run Add-Migration <name> to generate migrations.
When I run Update-Database I was running perfectly fine.
what I did is updating EF Core from 6.0.16 to 6.0.21, Added new Entity mytablename to my models so I
generate its migration. then I run Update-Database it gives me now
Microsoft.Data.SqlClient.SqlException (0x80131904): There is already an object named 'AspNetRoles' in the database. Error Number:2714,State:6,Class:16
mytablename is created but __EFMigrationsHistory is not updated.
I tried some solutions like drop db and recreated from scratch, then I tried deleting db and all migrations and regenerate them but it did not work still same error.
thank you for helping me I am new to EF Core and DotNet products.

I tried some solutions like dropping db and recreated it from scratch, then I tried deleting db and all migrations and regenerate them but it did not work still same error.
thank you for helping me I am new to EF Core and DotNet products.
here is the first migration:

public partial class CreateIdentitySchema : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.CreateTable(
            name: "AspNetRoles",
            columns: table => new
            {
                Id = table.Column<string>(nullable: false),
                Name = table.Column<string>(maxLength: 256, nullable: true),
                NormalizedName = table.Column<string>(maxLength: 256, nullable: true),
                ConcurrencyStamp = table.Column<string>(nullable: true)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_AspNetRoles", x => x.Id);
            });
    migrationBuilder.CreateTable(
        name: "AspNetUsers",
        columns: table => new
        {
            Id = table.Column<string>(nullable: false),
            UserName = table.Column<string>(maxLength: 256, nullable: true),
            NormalizedUserName = table.Column<string>(maxLength: 256, nullable: true),
            Email = table.Column<string>(maxLength: 256, nullable: true),
            NormalizedEmail = table.Column<string>(maxLength: 256, nullable: true),
            EmailConfirmed = table.Column<bool>(nullable: false),
            PasswordHash = table.Column<string>(nullable: true),
            SecurityStamp = table.Column<string>(nullable: true),
            ConcurrencyStamp = table.Column<string>(nullable: true),
            PhoneNumber = table.Column<string>(nullable: true),
            PhoneNumberConfirmed = table.Column<bool>(nullable: false),
            TwoFactorEnabled = table.Column<bool>(nullable: false),
            LockoutEnd = table.Column<DateTimeOffset>(nullable: true),
            LockoutEnabled = table.Column<bool>(nullable: false),
            AccessFailedCount = table.Column<int>(nullable: false)
        },
        constraints: table =>
        {
            table.PrimaryKey("PK_AspNetUsers", x => x.Id);
        });
migrationBuilder.CreateTable(
    name: "AspNetRoleClaims",
    columns: table => new
    {
        Id = table.Column<int>(nullable: false)
            .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
        RoleId = table.Column<string>(nullable: false),
        ClaimType = table.Column<string>(nullable: true),
        ClaimValue = table.Column<string>(nullable: true)
    },
    constraints: table =>
    {
        table.PrimaryKey("PK_AspNetRoleClaims", x => x.Id);
        table.ForeignKey(
            name: "FK_AspNetRoleClaims_AspNetRoles_RoleId",
            column: x => x.RoleId,
            principalTable: "AspNetRoles",
            principalColumn: "Id",
            onDelete: ReferentialAction.Cascade);
    });
migrationBuilder.CreateTable(
name: "AspNetUserClaims",
columns: table => new
{
Id = table.Column<int>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
UserId = table.Column<string>(nullable: false),
ClaimType = table.Column<string>(nullable: true),
ClaimValue = table.Column<string>(nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_AspNetUserClaims", x => x.Id);
table.ForeignKey(
name: "FK_AspNetUserClaims_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "AspNetUserLogins",
columns: table => new
{
LoginProvider = table.Column<string>(maxLength: 128, nullable: false),
ProviderKey = table.Column<string>(maxLength: 128, nullable: false),
ProviderDisplayName = table.Column<string>(nullable: true),
UserId = table.Column<string>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_AspNetUserLogins", x => new { x.LoginProvider, x.ProviderKey });
table.ForeignKey(
name: "FK_AspNetUserLogins_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "AspNetUserRoles",
columns: table => new
{
UserId = table.Column<string>(nullable: false),
RoleId = table.Column<string>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_AspNetUserRoles", x => new { x.UserId, x.RoleId });
table.ForeignKey(
name: "FK_AspNetUserRoles_AspNetRoles_RoleId",
column: x => x.RoleId,
principalTable: "AspNetRoles",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_AspNetUserRoles_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "AspNetUserTokens",
columns: table => new
{
UserId = table.Column<string>(nullable: false),
LoginProvider = table.Column<string>(maxLength: 128, nullable: false),
Name = table.Column<string>(maxLength: 128, nullable: false),
Value = table.Column<string>(nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_AspNetUserTokens", x => new { x.UserId, x.LoginProvider, x.Name });
table.ForeignKey(
name: "FK_AspNetUserTokens_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateIndex(
name: "IX_AspNetRoleClaims_RoleId",
table: "AspNetRoleClaims",
column: "RoleId");
migrationBuilder.CreateIndex(
name: "RoleNameIndex",
table: "AspNetRoles",
column: "NormalizedName",
unique: true,
filter: "[NormalizedName] IS NOT NULL");
migrationBuilder.CreateIndex(
name: "IX_AspNetUserClaims_UserId",
table: "AspNetUserClaims",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_AspNetUserLogins_UserId",
table: "AspNetUserLogins",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_AspNetUserRoles_RoleId",
table: "AspNetUserRoles",
column: "RoleId");
migrationBuilder.CreateIndex(
name: "EmailIndex",
table: "AspNetUsers",
column: "NormalizedEmail");
migrationBuilder.CreateIndex(
name: "UserNameIndex",
table: "AspNetUsers",
column: "NormalizedUserName",
unique: true,
filter: "[NormalizedUserName] IS NOT NULL");

}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropTable(
name: "AspNetRoleClaims");
migrationBuilder.DropTable(
    name: "AspNetUserClaims");
migrationBuilder.DropTable(
name: "AspNetUserLogins");
migrationBuilder.DropTable(
name: "AspNetUserRoles");
migrationBuilder.DropTable(
name: "AspNetUserTokens");
migrationBuilder.DropTable(
name: "AspNetRoles");
migrationBuilder.DropTable(
name: "AspNetUsers");

}

}

When I populate __EFMigrationsHistory manually and run update-database it works fine , but when I drop the db and rerun update-database it gives the same error.
When I run dotnet ef migrations list:

> 00000000000000_CreateIdentitySchema (Pending)
>
> 20230807142821_CreateAppDb (Pending)
>
> 20230809091829_AppTable (Pending)
>
> 20230809100343_UserPersonalData (Pending)
>
> 20230810084347_db (Pending)
>

>
> Program:
>

    public static class Program
{
    public static async Task Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);
    // Add services to the container.
    var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
    builder.Services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(connectionString));
    builder.Services.AddDatabaseDeveloperPageExceptionFilter();
builder.Services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>();
builder.Services.AddControllersWithViews();
//authorization to apps policies
builder.Services.AddAuthorization(options =>
{
options.AddPolicy("DelibAppAccess", policy =>
policy.RequireClaim("AllowedToAppName"));
});
builder.Services.AddScoped<IApplicationService, ApplicationService>();
builder.Services.AddScoped<IRoleService, RoleService>();
builder.Services.AddScoped<IRegisterService, RegisterService>();
//identity password
builder.Services.Configure<IdentityOptions>(options =>
{
// Default Password settings.
options.Password.RequireDigit = false;
options.Password.RequireLowercase = false;
options.Password.RequireNonAlphanumeric = false;
options.Password.RequireUppercase = false;
options.Password.RequiredLength = 6;
options.Password.RequiredUniqueChars = 0;
});
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseMigrationsEndPoint();
}
else
{
app.UseExceptionHandler("/Home/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
app.MapRazorPages();
using (var scope = app.Services.CreateScope())
{
var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
var roles = new[] { "SuperAdmin", "Admin", "Member", "Guest" };
foreach (var role in roles)
{
if (!await roleManager.RoleExistsAsync(role))
await roleManager.CreateAsync(new IdentityRole(role));
}
var dbContext = scope.ServiceProvider.GetService<ApplicationDbContext>();
var apps = new[] { "AppName" };
if (dbContext is not null)
{
foreach (var application in apps)
{
if (!dbContext.Applications!.Where(a => a.Label.Equals(application)).Any())
{
dbContext.Applications!.Add(new Application() { Label = application });
}
}
await dbContext.SaveChangesAsync();
}
}
app.Run();

}

}

>
> DbContext
>

public class ApplicationDbContext : 
    IdentityDbContext<ApplicationUser>
    {
    public ApplicationDbContext()
    {
    }
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
    {
        try
            {
                if (Database.GetService<IDatabaseCreator>() is RelationalDatabaseCreator databaseCreator)
                {
                    if (!databaseCreator.CanConnect())
                    {
                        databaseCreator.CreateAsync().Wait();
                    }
                    if (!databaseCreator.HasTables())
                    {
                        databaseCreator.CreateTablesAsync().Wait();
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    //filtering users by isEnabled
    modelBuilder.Entity<ApplicationUser>().HasQueryFilter(user => user.IsEnabled);
    base.OnModelCreating(modelBuilder);
}
public DbSet<Application>? Applications { get; set; }

}

答案1 {#1}

得分: 0

我通过移除以下代码解决了这个问题：

try
{
  if (Database.GetService<IDatabaseCreator>() is RelationalDatabaseCreator databaseCreator)
  {
    if (!databaseCreator.CanConnect())
    {
      databaseCreator.CreateAsync().Wait();
    }
    if (!databaseCreator.HasTables())
    {
      databaseCreator.CreateTablesAsync().Wait();
    }
  }
}
catch (Exception ex)
{
  Console.WriteLine(ex.ToString());
}

英文:

I solved the problem by removing:

try
{
  if (Database.GetService<IDatabaseCreator>() is RelationalDatabaseCreator databaseCreator)
  {
    if (!databaseCreator.CanConnect())
    {
      databaseCreator.CreateAsync().Wait();
    }
    if (!databaseCreator.HasTables())
    {
      databaseCreator.CreateTablesAsync().Wait();
    }
  }
}
catch (Exception ex)
{
  Console.WriteLine(ex.ToString());
}