LINQ 子查询选择所有列，而不是仅选择指定列

Question

我有以下 LINQ 查询：

var query =
       from store in _dbContext.Stores.AsNoTracking()
       join shelf in _dbContext.Shelves.AsNoTracking()
            on store.Id equals shelf.StoreId into storeShelf
       join customers in 
        (
            from customer in _dbContext.Customers.AsNoTracking()
            where customer.IsActive
            select new { customer.Name, customer.shelfId }
        ) on storeShelf.Id equals customers.shelfId into shelfCustomer
       from shelfCustomer2 in shelfCustomer.DefaultIfEmpty()
       select new CompleteModel
       {
           StoreName = store.Name,
           CustomerName = shelfCustomer2.Name
       };

问题是子查询翻译错误。而不是：

...
SELECT c.Name, c.Age
FROM [dbo].[Customer]
WHERE c.IsActive = 1
...

EF翻译为：

...
SELECT c.Id, c.Name, c.Surname, c.Age, c.AddressId, ...
FROM [dbo].[Customer]
WHERE c.IsActive = 1

在子查询中选择所有列，而不仅仅是这两个列。

Answer 1

即使 EF Core 3.x 已过时，它仍然应该正确处理以下 LINQ 查询：

var query =
    from store in _dbContext.Stores
    join shelf in _dbContext.Shelves on store.Id equals shelf.StoreId
    from shelfCustomer in _dbContext.Customers
        .Where(c => c.shelfId == shelf.Id && c.IsActive)
        .DefaultIfEmpty()
    select new CompleteModel
    {
        StoreName = store.Name,
        CustomerName = shelfCustomer.Name
    };

请注意，我已删除

AsNoTracking()

，因为它在使用投影时是多余的。此外，

AsNoTracking()

只需在查询中应用一次。