c# - GroupBy 与 linq 方法语法(不是查询语法)

Question

如果我使用扩展方法语法，下面的查询会是什么样子？

var query = from c in checks
group c by string.Format("{0} - {1}", c.CustomerId, c.CustomerName) 
into customerGroups
select new { Customer = customerGroups.Key, Payments = customerGroups }

Answer 1

看起来像这样:

var query = checks
    .GroupBy(c => string.Format("{0} - {1}", c.CustomerId, c.CustomerName))
    .Select (g => new { Customer = g.Key, Payments = g });