如何从 IRouter 访问存储库

Question

我正在开发模块化应用程序，我希望来自不同模块的实体能够注册他们自己的友好 url slug。

app.UseMvc(routes =>
{
    routes.Routes.Add(new SlugRouter(routes.DefaultHandler));
    (...)
});

但是下面的代码抛出 无法访问已处置的对象。对象名称：'CommerceDbContext'. 尝试从存储库访问 slug 时。

public class SlugRouter : IRouter
{
    private readonly IRouter _target;

    public SlugRouter(IRouter target)
    {
        _target = target;
    }

    public async Task RouteAsync(RouteContext context)
    {
        var slugRepository = context.HttpContext.RequestServices.GetService<IRepository<SlugEntity>>();

        // ERROR: Cannot access a disposed object. Object name: 'CommerceDbContext'
        var urlSlug = await slugRepository.GetAllIncluding(x => x.EntityType).FirstOrDefaultAsync(x => x.Slug == context.HttpContext.Request.Path.Value);
        (...)
    }

我想从路由器访问存储库一定是简单的事情。感谢您的帮助。

Answer 1

开始 unit of work:

public async Task RouteAsync(RouteContext context)
{
    var slugRepository = context.HttpContext.RequestServices.GetService<IRepository<SlugEntity>>();
    var unitOfWorkManager = context.HttpContext.RequestServices.GetService<IUnitOfWorkManager>();

    using (var uow = unitOfWorkManager.Begin())
    {
        var urlSlug = await slugRepository.GetAllIncluding(x => x.EntityType).FirstOrDefaultAsync(x => x.Slug == context.HttpContext.Request.Path.Value);
        await uow.CompleteAsync();
    }
}

Answer 2

访问 IModel。您不需要 dbContext for.

for entities from different modules to be able to register their own friendly url slugs

我是这样做的：

1) 将 OnModelCreating 移动到静态方法

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        BuildModel(modelBuilder);
    }

    public static void BuildModel(ModelBuilder modelBuilder)
    {
        // ...
    }

2) 在需要的地方创建模型：

        var conventionSet = new ConventionSet();
        var modelBuilder = new ModelBuilder(conventionSet);
        AdminkaDbContext.BuildModel(modelBuilder);
        var mutableModel = modelBuilder.Model;

有你的元数据（在 mutableModel 中）。您可以遍历实体（实体类型）。

如何从 IRouter 访问存储库

How to access repository from IRouter

entity-framework-core

aspnetboilerplate