实体框架核心迁移

Question

所以我在 EF 中的迁移方面遇到了问题。我正在尝试熟悉一个较旧的 WPF 项目，并且我已经进行了一些重组。我将 Context 移至具有通用代码的类库

namespace WPFDemoApp.Common.Context
{
    public class ApplicationDbContext<TEntity> : DbContext where TEntity : class
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext<TEntity>> options)
            : base(options)
        {
        }

        public DbSet<TEntity> Entities { get; set; }

    }

    public class ApplicationDbContextFactory<TEntity> : IDesignTimeDbContextFactory<ApplicationDbContext<TEntity>> where TEntity : class
    {
        public ApplicationDbContext<TEntity> CreateDbContext(string[] args)
        {
            var optionsBuilder = new DbContextOptionsBuilder<ApplicationDbContext<TEntity>>();
            optionsBuilder.UseSqlite("Data Source=localdatabase.db");

            return new ApplicationDbContext<TEntity>(optionsBuilder.Options);
        }
    }
}

它注册在不同的项目中

namespace WPFDemoApp
{
    public static class ServiceRegistration
    {
        public static IServiceProvider ConfigureServices()
        {
            var services = new ServiceCollection();

            // Register services here
            services.AddDbContext<ApplicationDbContext<ToDoItem>>(
            options => options.UseSqlite("Data Source=localdatabase.db"));

            services.AddScoped<MainWindow>();
            services.AddScoped<ToDoItem>();
            services.AddScoped<IRepository<ToDoItem>, Repository<ToDoItem>>();
            services.AddScoped<IGetAllDataUseCase<ToDoItem>, GetAllDataUseCase<ToDoItem>>();
            services.AddScoped<MainViewModel<ToDoItem>>();

            // Add other services
            return services.BuildServiceProvider();
        }
    }
}

当我使用

有谁知道为什么吗？

我尝试过运行不同的命令，但旧的 WPF 结构让我头疼。

Answer 1

使用非通用 DbContext 进行迁移

namespace WPFDemoApp.Common.Context
{
    public class ApplicationDbContext : DbContext
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }

        public DbSet<ToDoItem> ToDoItems { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            // Apply configurations here if any
        }
    }

    public class ApplicationDbContextFactory : IDesignTimeDbContextFactory<ApplicationDbContext>
    {
        public ApplicationDbContext CreateDbContext(string[] args)
        {
            var optionsBuilder = new DbContextOptionsBuilder<ApplicationDbContext>();
            optionsBuilder.UseSqlite("Data Source=localdatabase.db");

            return new ApplicationDbContext(optionsBuilder.Options);
        }
    }
}

修改服务注册： 在您的 DI 容器中注册非通用 ApplicationDbContext：

namespace WPFDemoApp
{
    public static class ServiceRegistration
    {
        public static IServiceProvider ConfigureServices()
        {
            var services = new ServiceCollection();

            // Register services here
            services.AddDbContext<ApplicationDbContext>(
                options => options.UseSqlite("Data Source=localdatabase.db"));

            services.AddScoped<MainWindow>();
            services.AddScoped<ToDoItem>();
            services.AddScoped<IRepository<ToDoItem>, Repository<ToDoItem>>();
            services.AddScoped<IGetAllDataUseCase<ToDoItem>, GetAllDataUseCase<ToDoItem>>();
            services.AddScoped<MainViewModel<ToDoItem>>();

            // Add other services
            return services.BuildServiceProvider();
        }
    }
}

运行迁移：

添加-迁移InitialCreate -Project YourProjectName -StartupProject YourStartupProjectName -Context ApplicationDbContext