我知道如何使用我的 startup.cs 类和创建一些初始数据的
SeederSeed().NET 5.0的数据库中。
public void Configure(IApplicationBuilder app, IHostingEnvironment env, Seeder seeder)
{
seeder.Seed();
..............
// other configurations
}
如何在 .NET 6.0 中执行此操作？没有地方可以添加我的
Seeder我解决了类似的问题如下：
程序.cs (.NET 6)
...
builder.Services.AddScoped<IDbInitializer, DbInitializer>(); //can be placed among other "AddScoped" - above: var app = builder.Build();
...
SeedDatabase(); //can be placed above app.UseStaticFiles();
...
void SeedDatabase() //can be placed at the very bottom under app.Run()
{
using (var scope = app.Services.CreateScope())
{
var dbInitializer = scope.ServiceProvider.GetRequiredService<IDbInitializer>();
dbInitializer.Initialize();
}
}
我以前从未使用过你的解决方案。这就是我正在做的事情，
public class DataContext: DbContext
{
public DataContext(DbContextOptions options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
new DbInitializer(modelBuilder).Seed();
}
// Db sets
}
还有
public class DbInitializer
{
private readonly ModelBuilder modelBuilder;
public DbInitializer(ModelBuilder modelBuilder)
{
this.modelBuilder = modelBuilder;
}
public void Seed()
{
modelBuilder.Entity<User>().HasData(
new User(){ Id = 1.... },
new User(){ Id = 2.... },
);
}
}
然后运行命令
dotnet ef migrations add .......
创建迁移文件
还有
dotnet ef database update
更新数据库
使用这些链接获取详细版本：
Program.csvar builder = WebApplication.CreateBuilder(args);
//Add services to the container.
builder.Services.AddDbContext<YourDbContext>(
optionsBuilder => optionsBuilder.UseSqlServer("Your connection string goes here") //install - Microsoft.EntityFrameworkCore.SqlServer to use ".UseSqlServer" extension method
builder.Services.AddScoped<DbInitializer>();
var app = builder.Build();
//Configure the HTTP-request pipeline
if (app.Environment.IsDevelopment())
{
app.UseItToSeedSqlServer(); //custom extension method to seed the DB
//configure other services
}
app.Run();
DbInitializerExtension.csinternal static class DbInitializerExtension
{
public static IApplicationBuilder UseItToSeedSqlServer(this IApplicationBuilder app)
{
ArgumentNullException.ThrowIfNull(app, nameof(app));
using var scope = app.ApplicationServices.CreateScope();
var services = scope.ServiceProvider;
try
{
var context = services.GetRequiredService<YourDbContext>();
DbInitializer.Initialize(context);
}
catch (Exception ex)
{
}
return app;
}
}
DbInitializer.csinternal class DbInitializer
{
internal static void Initialize(YourDbContext dbContext)
{
ArgumentNullException.ThrowIfNull(dbContext, nameof(dbContext));
dbContext.Database.EnsureCreated();
if (dbContext.Users.Any()) return;
var users = new User[]
{
new User{ Id = 1, Name = "Bruce Wayne" }
//add other users
};
foreach(var user in users)
dbContext.Users.Add(user);
dbContext.SaveChanges();
}
}
就我而言，我使用 Microsoft.AspNetCore.Identity 并需要使用种子方法使用数据库中的默认值初始化应用程序。
builder.Services.AddScoped<UserManager<ApplicationUser>>();
builder.Services.AddScoped<RoleManager<IdentityRole>>();
在包含
的行之后var app = builder.Build();
我已经调用了种子方法：
using (var scope = app.Services.CreateScope())
{
var userManager = scope.ServiceProvider.GetRequiredService<UserManager<Usuario>>();
var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
await DefaultRoles.SeedAsync(roleManager);
await DefaultAdmin.SeedAsync(userManager);
}
Seeder.cs
public static class Seeder
{
public static void Initialize(DatabaseContext context)
{
context.Database.EnsureCreated();
//your seeding data here
context.SaveChanges();
}
}
程序.cs
var app = builder.Build();
SeedDatabase();
void SeedDatabase()
using(var scope = app.Services.CreateScope())
try{
var scopedContext = scope.ServiceProvider.GetRequiredService<DatabaseContext>();
Seeder.Initialize(scopedContext);
}
catch{
throw;
}
就像使用 DI 之前一样简单。
我知道有关 .NET 6.0 的问题，但我认为它具有相同的概念。
就我而言，我使用的是 .NET 8.0，并使用 Microsoft.AspNetCore.Identity，因此我需要使用种子方法在数据库中使用默认值（Defulat 用户和 Defulat 角色）来初始化应用程序。
首先，我创建一个类，并在其中定义一个枚举“包含我拥有的角色”，并编写与默认用户“姓名、电子邮件、密码、角色...等”相关的主要信息。
然后我创建一个名为
ApplicationDbContextSeedpublic class ApplicationDbContextSeed
{
public async Task<bool> SeedEssentialsAsync(UserManager<ApplicationUser> userManager,
RoleManager<IdentityRole> roleManager)
{
//Seed Roles
await roleManager.CreateAsync(new IdentityRole(Authorization.Roles.SuperUser.ToString()));
await roleManager.CreateAsync(new IdentityRole(Authorization.Roles.User.ToString()));
//Seed Default User
var defaultUser = new ApplicationUser
{
Firstname= Authorization.default_Firstname,
Lastrname= Authorization.default_Lastname,
UserName = Authorization.default_username,
Email = Authorization.default_email,
EmailConfirmed = true,
PhoneNumberConfirmed = true,
IsPasswordChanged = true,
IsActive = true
};
if (userManager.Users.All(u => u.Id != defaultUser.Id))
{
await userManager.CreateAsync(defaultUser, Authorization.default_password);
await userManager.AddToRoleAsync(defaultUser, Authorization.superuser_role.ToString());
}
return true;
}
}
在 Program.cs 中：
var app = builder.Build();
if (args.Length == 1 && args[0].ToLower() == "seeddata")
await SeedData(app);
async Task SeedData(IHost app)
{
var scopedFactory = app.Services.GetService<IServiceScopeFactory>();
using (var scope = scopedFactory?.CreateScope())
{
var service = scope?.ServiceProvider.GetService<ApplicationDbContextSeed>();
var userManager = scope?.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();
var roleManager = scope?.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
await service.SeedEssentialsAsync(userManager, roleManager);
}
}
在我创建第一次迁移
Add-Migration InitialCreateUpdate-databasedotnet run seeddata希望它可以帮助任何陷入这部分的人。