了解如何使存储库查询异步

Question

我的存储库中有以下 LINQ 查询，其行为符合预期：

public ICollection<Address> GetManufacterAddressesFromProductId(Guid productId)
{
    return Context.Products
        .First(product => product.Id == productId)
        .Manufacturer
        .Addresses;
}

如何使此调用异步？这是我目前的解决方案，似乎...太长了？

public async Task<ICollection<Address>> GetManufacterAddressesFromProductIdAsync(Guid productId)
{  
    var product = await Context.Products.FirstAsync(x => x.Id == productId);
    var manufacturerId = product.ManufacturerId;
    return await Context.ManufacturerAddresses.Where(x => x.ManufacturerId == manufacturerId ).ToListAsync();
}

让我觉得这并没有真正正确地做事，因为无论如何它都必须等待第一个调用完成 - 有点违背要点？

Answer 1

通过以下方式：

public Task<ICollection<Address>> GetManufacterAddressesFromProductId(Guid productId)
{
    return Context.Products
        .Where(product => product.Id == productId)
        .Select(product => product.Manufacturer.Addresses)
        .FirstAsync();
}

另请注意同步版本无效。应该是：

public ICollection<Address> GetManufacterAddressesFromProductId(Guid productId)
{
    return Context.Products
        .Where(product => product.Id == productId)
        .Select(product => product.Manufacturer.Addresses)
        .First();
}

了解如何使存储库查询异步

Understanding how to make repository queries asynchronous

c#

linq

asynchronous

repository