LINQ Group By Multiple fields语法可以帮助您基于多个字段对数据进行分组。以下是LINQ Group By Multiple fields的语法示例: 代码语言:txt 复制 var result = from item in collection group item by new { item.Field1, item.Field2 } into g select g; ...
How to multiple Group by in LINQ Cust_Id Order_Id Product_ID Price 1 1 1 200 1 2 2 300 1 3 3 500
linq中的join是inner join内连接,就是当两个表中有一个表对应的数据没有的时候那个关联就不成立。比如表A B的数据如下 ?...from a in A join b in B on a.BId equals b.Id select new {a.Id, b.Id} 的结果是 {1,1} {2,2} {4...
I have created a linq query for the child row table of the jquery datatable. It's working. The problem is that I want to display the product name instead of the productid of the table order. I would appreciate it if someone could help. public JsonResult Getrecord() { Copy var List ...
C# Linq Group By on multiple columns C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary ke...
{ Console.WriteLine($"ID:{student.ID},Name:{student.Name},Age:{student.Age}"); } } 三、测试结果 四、参考网址 https://dotnettutorials.net/lesson/groupby-multiple-keys-in-linq/ 个人代码见...CSharpBasic\LINQTutorial..
order by c.c1, c.c2, b.b2 Since i have a nested join and i am grouping at both levels it is proving to be a bit awkward. I am also getting familiar with LINQ to dataset. Any help would be appreciated. Viewing 0 posts You must be logged in to reply to this topic.Login to rep...
from t1 in MyTable where t1.Active = 1 OR t2.Active = 1 where t1.Linked_ID == t1.MyTable.ID select t1 By adhering to the guidelines provided at https://newbedev.com/linqpad- convert-sql -to- linq-command , you can proceed with the task. ...
. The variables b, c, and d will run multiple queries (3 times). If the number of dataset is large that certainly there will be a performance bottleneck. To easy way to fix this is to cache the query result by simply adding aToList()orToArray()afterLINQso that the query result is...
public int Count3; public int Count4; public int Count5; ... } But couldn't think about how I would do the select statement since most of the time there would be only 7 or 8. Any way to change the Linq query to handle this? Thanks, Tom...