[英]Subquery in LINQ that's in the select statement, not the where clause
我需要做類似以下的事情
SELECT p.name,
(SELECT COUNT(p.id) FROM products WHERE products.parent_id = p.id) AS sub_products
FROM products AS p
我在where子句中看到了很多子查詢的LINQ示例,但是在select語句中沒有這樣的例子。
此查詢應該是等效的:
var query = Products.Select(p => new {
p.Name,
SubProducts = Products.Count(c => c.parent_id == p.id)
});
foreach (var item in query)
{
Console.WriteLine("{0} : {1}", item.Name, item.SubProducts);
}
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