You basically want to do a left outer join. The way you currently are using the DefaultIfEmpty method is that if the entire list is empty you provide a ... ... <看更多>

使用 DefaultIfEmpty ，如果找不到匹配項，傳統的Linq Join 可以返回預設物件。 ... on l equals (int)r into leftJoin from result in leftJoin. ... <看更多>

join p in SLIST. on o.Classroom equals p.Classroom. into g from a in g.DefaultIfEmpty(). join s in ScoreList. on new {. x=(a==null||a.ID==null)?"N/A":a. ... <看更多>

今天我們來看 GroupBy 跟 Join 的合體 GroupJoin ，一般資料表都會是一對多的關聯設計，很 ... 用 GroupJoin 搭配 DefaultIfEmpty 和 SelectMany 達到Left Join的效果. ... <看更多>

Left Join Example in C# Linq This example used in this below website fmworldmusic.in -------------- May be you like this -------------- Our ... ... <看更多>