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c#asp.net核心寄存器嵌套泛型类

dependency-injection asp.net-core c#

0

r3plica · 技术社区 · 5 年前

我有一节课是这样的:

public class GenericList<T> : IRequest<Attempt<IQueryable<T>>>
{
}

public class GenericListHandler<T> : IRequestHandler<GenericList<T>, Attempt<IQueryable<T>>> where T: class
{
    private readonly DatabaseContext _databaseContext;
    public GenericListHandler(DatabaseContext databaseContext) => _databaseContext = databaseContext;

    public async Task<Attempt<IQueryable<T>>> Handle(GenericList<T> request, CancellationToken cancellationToken) =>
        Attempt<IQueryable<T>>.Succeed(_databaseContext.Set<T>());
}

我想把它登记在我的启动班级。

services.AddTransient(typeof(GenericListHandler<>), typeof(GenericListHandler<>));

但这并不能解决问题。我相信是因为它需要下决心 IRequestHandler<GenericList<T>, Attempt<IQueryable<T>>>

services.AddTransient(serviceType: typeof(IRequestHandler<GenericList<>, Attempt<IQueryable<>>>),typeof(GenericListHandler<>));

但它不喜欢。我得到这个错误:

意外使用了未绑定的泛型名称

我也尝试过:

services.AddTransient(serviceType: typeof(IRequestHandler<,>),typeof(GenericListHandler<>));

有人能帮我吗?

0 回复 | 直到 5 年前

1

0

r3plica 5 年前

显然,您不能注册嵌套泛型:

Cannot register nested generic interface in .NET Core

private static void AddGenericList(IServiceCollection services)
{
    services
        .AddTransient<IRequestHandler<GenericList<Attribute>, Attempt<IQueryable<Attribute>>>,
            GenericListHandler<Attribute>>();
    services
        .AddTransient<IRequestHandler<GenericList<Brand>, Attempt<IQueryable<Brand>>>,
            GenericListHandler<Brand>>();
    services
        .AddTransient<IRequestHandler<GenericList<Category>, Attempt<IQueryable<Category>>>,
            GenericListHandler<Category>>();
    services
        .AddTransient<IRequestHandler<GenericList<Conversion>, Attempt<IQueryable<Conversion>>>,
            GenericListHandler<Conversion>>();
    services
        .AddTransient<IRequestHandler<GenericList<Criterion>, Attempt<IQueryable<Criterion>>>,
            GenericListHandler<Criterion>>();
    services
        .AddTransient<IRequestHandler<GenericList<Exclusion>, Attempt<IQueryable<Exclusion>>>,
            GenericListHandler<Exclusion>>();
    services
        .AddTransient<IRequestHandler<GenericList<Feed>, Attempt<IQueryable<Feed>>>,
            GenericListHandler<Feed>>();
    services
        .AddTransient<IRequestHandler<GenericList<FieldMap>, Attempt<IQueryable<FieldMap>>>,
            GenericListHandler<FieldMap>>();
    services
        .AddTransient<IRequestHandler<GenericList<Field>, Attempt<IQueryable<Field>>>,
            GenericListHandler<Field>>();
    services
        .AddTransient<IRequestHandler<GenericList<Filter>, Attempt<IQueryable<Filter>>>,
            GenericListHandler<Filter>>();
    services
        .AddTransient<IRequestHandler<GenericList<Floor>, Attempt<IQueryable<Floor>>>,
            GenericListHandler<Floor>>();
    services
        .AddTransient<IRequestHandler<GenericList<Formula>, Attempt<IQueryable<Formula>>>,
            GenericListHandler<Formula>>();
    services
        .AddTransient<IRequestHandler<GenericList<Plan>, Attempt<IQueryable<Plan>>>,
            GenericListHandler<Plan>>();
    services
        .AddTransient<IRequestHandler<GenericList<Rule>, Attempt<IQueryable<Rule>>>,
            GenericListHandler<Rule>>();
    services
        .AddTransient<IRequestHandler<GenericList<Theatre>, Attempt<IQueryable<Theatre>>>,
            GenericListHandler<Theatre>>();
    services
        .AddTransient<IRequestHandler<GenericList<Transformation>, Attempt<IQueryable<Transformation>>>,
            GenericListHandler<Transformation>>();
    services
        .AddTransient<IRequestHandler<GenericList<Venue>, Attempt<IQueryable<Venue>>>,
            GenericListHandler<Venue>>();
}

这不是最理想的解决方案,但确实有效。