public AppDbContext(IServiceProvider serviceProvider)
{
_shellSettings = serviceProvider.GetRequiredService <ShellSettings>();
_entityManager = serviceProvider.GetRequiredService <IEntityTypeProvider>();
_dbMigrator = serviceProvider.GetRequiredService <AppDbMigrator>();
_appDbContextOptions = serviceProvider.GetRequiredService <AppDbContextOptions>();
if (_shellSettings.Name == "Default")
{
if (_shellSettings.TablePrefix == null && _shellSettings.ConnectionString == null && _shellSettings.DatabaseProvider == null)
{
_shellSettings.TablePrefix = _appDbContextOptions?.TablePrefix;
_shellSettings.ConnectionString = _appDbContextOptions?.ConnectionString;
_shellSettings.DatabaseProvider = _appDbContextOptions?.DatabaseProvider;
}
}
}
/// <summary>
/// 向系统注册使用EntityFrameworkCore作为数据持久化存储方案，
/// 添加该项后会在内部维护/添加一个全局的（生命同期为单例）的数据库上下文实例（AppDbContext）,
/// 所有注册到该上下文的实体的数据库操作都通过该上下文实现。
/// 实体的发现是跟据EF的特点，通过加载IEntityTypeConfiguration<T>实例间接发现实体的，所以一定要为需要通过该AppDbContext操作的实体创建一个对应的IEntityTypeConfiguration<T>实例。
/// </summary>
/// <param name="services"></param>
/// <param name="appDbContextOptions">用于提供非多租户时的情况下的一些数据库连接连接选项（多租户时有专门的配置文件tenants.json或通过程序录入方案settings.txt）</param>
/// <param name="migrationsAssemblyName">设置用于该EF内维护的数据上下文（AppDbContext）的数据迁移的程序集名称</param>
/// <returns></returns>
public static IServiceCollection AddEntityFrameworkCore(this IServiceCollection services, Action <AppDbContextOptions> appDbContextOptions = null, string migrationsAssemblyName = null)
{
//services.AddDbContext<AppDbContext>((a, b) =>
//{
// var shellSettions = a.GetService<ShellSettings>();
// b.UseSqlServer(shellSettions.ConnectionString);
//});
var appDbContextOptins = new AppDbContextOptions();
appDbContextOptions?.Invoke(appDbContextOptins);
services.AddSingleton(appDbContextOptins);
services.AddSingleton(new AppDbMigrator()
{
MigrationsAssembly = migrationsAssemblyName
});
services.AddSingleton <IEntityTypeProvider, DefaultEntityTypeProvider>();
services.AddDbContext <AppDbContext>();
return(services);
}