IAsyncQueryableExecuter ,IAsyncQueryableProvider

利用这俩个 api 实现在仓储层实现和数据库完全解耦，IAsyncQueryableProvider 的实现者要靠具体 的数据库提供程序 IAsyncQueryableProvider 多个对象 会注入 IAsyncQueryableExecuter 类的构造 函数

如下的伪代码说明了

public class PersonAppService : ApplicationService
{
    private readonly IRepository<Person, Guid> _personRepository;
    private readonly IAsyncQueryableExecuter _asyncExecuter;

    public PersonAppService(IRepository<Person, Guid> personRepository, IAsyncQueryableExecuter asyncExecuter)
    {
        _personRepository = personRepository;
        _asyncExecuter = asyncExecuter;
    }

    public async Task CreateAsync(CreatePersonDto input)
    {
        var person = new Person(input.Name);
        await _personRepository.InsertAsync(person);
    }

    public async Task<int> GetCountAsync(string filter)
    {
        var queryable = _personRepository.Where(p => p.Name.Contains(filter));
        return await _asyncExecuter.CountAsync(queryable);
    }
}
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