摘要：
1. Concat 单列Concatvar expr = (from p in context.Products select p.ProductName) .Concat( from c in context.Categories... 阅读全文
摘要：
1. Any 返回没有Product的Categoryvar expr = from c in context.Categories where !c.Products.Any() select c;SELECT [Extent1].[Categ... 阅读全文
摘要：
1. 简单形式var expr = from p in context.Products group p by p.CategoryID into g select g;foreach (var item in expr){ Console.WriteL... 阅读全文