Comments on: How to Use Grouping in C# LINQ Syntax http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/ Thu, 29 Sep 2011 17:23:04 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: JW http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-1864 JW Tue, 18 Jan 2011 18:29:21 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-1864 Great explination, clear english ;-) butt the.. Code is wrong )-; [group.Key, group.Count()] should be [group.Count(), group.Key] 1 employees report to 2? var emp1 = new { ReportsTo = "Jim", LastName = "Richard" }; var emp2 = new { ReportsTo = "Jim", LastName = "Christopher" }; var emp3 = new { ReportsTo = "Bob", LastName = "John" }; var emp4 = new { ReportsTo = "Bob", LastName = "Greg" }; var employees = new[] { emp1, emp2, emp3, emp4 }; var groups = from employee in employees group employee by employee.ReportsTo; foreach (var group in groups) Console.WriteLine("{0} employees report to {1}.", group.Count(), group.Key); Great explination, clear english ;-) butt the..

Code is wrong )-; [group.Key, group.Count()]
should be [group.Count(), group.Key]

1 employees report to 2?

var emp1 = new { ReportsTo = “Jim”, LastName = “Richard” };
var emp2 = new { ReportsTo = “Jim”, LastName = “Christopher” };
var emp3 = new { ReportsTo = “Bob”, LastName = “John” };
var emp4 = new { ReportsTo = “Bob”, LastName = “Greg” };
var employees = new[] { emp1, emp2, emp3, emp4 };

var groups =
from employee in employees
group employee by employee.ReportsTo;

foreach (var group in groups)
Console.WriteLine(“{0} employees report to {1}.”, group.Count(), group.Key);

]]> By: Mathieson http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-530 Mathieson Fri, 09 Jul 2010 23:11:39 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-530 evlin, like is actually a subquery that returns a boolean value. In LINQ you can use any function that does that in the where function/clause. To replicate LIKE %mr%, for example, you can do from l in list where l.Title.Contains("mr") select l.Title but it's much more flexible than that. evlin, like is actually a subquery that returns a boolean value. In LINQ you can use any function that does that in the where function/clause. To replicate LIKE %mr%, for example, you can do
from l in list
where l.Title.Contains(“mr”)
select l.Title

but it’s much more flexible than that.

]]> By: Mike Anderson http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-74 Mike Anderson Thu, 17 Dec 2009 11:31:26 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-74 Excellent! I've just started trying to do come more complex reporting in LINQ instead of T-SQL, and its actually working thanks to your article. ;D Excellent! I’ve just started trying to do come more complex reporting in LINQ instead of T-SQL, and its actually working thanks to your article. ;D

]]> By: Argentino http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-73 Argentino Wed, 04 Nov 2009 04:32:58 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-73 Thanks! Very useful! Thanks! Very useful!

]]> By: Gideon http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-72 Gideon Fri, 04 Sep 2009 07:55:13 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-72 Thanks for the article. Some of the other linq features frustrated me, so I decided to read the manual before using this one. Thanks for the article. Some of the other linq features frustrated me, so I decided to read the manual before using this one.

]]> By: Marwan http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-71 Marwan Mon, 24 Aug 2009 12:36:08 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-71 brilliant article i was going nuts trying to understand the group by until i read this! cheers brilliant article i was going nuts trying to understand the group by until i read this!

cheers

]]> By: Marc http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-70 Marc Wed, 11 Mar 2009 17:35:21 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-70 Excellent article. Thanks Excellent article. Thanks

]]> By: evlin http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-69 evlin Wed, 11 Feb 2009 14:50:49 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-69 nice article.. in sql we usually use "select * from table where field like '%%'" so, Could i use syntax "like" in linq?? thanks ^^ nice article..

in sql we usually use “select * from table where field like ‘%%’”

so, Could i use syntax “like” in linq?? thanks ^^

]]> By: Oli http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-68 Oli Tue, 28 Oct 2008 09:08:11 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-68 Thanks for writing it up. I was also initially very confused by expecting this to work in a similar way to grouping with T-SQL. Thanks for writing it up. I was also initially very confused by expecting this to work in a similar way to grouping with T-SQL.

]]> By: chris http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-67 chris Wed, 03 Sep 2008 21:21:18 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-67 pretty good article … you should go on explain all these Linq stuff. Thanks, Chris pretty good article … you should go on explain all these Linq stuff.
Thanks, Chris

]]> By: ulu http://www.richardbushnell.net/2008/02/08/how-to-use-grouping-in-c-linq-syntax/comment-page-1/#comment-66 ulu Thu, 27 Mar 2008 13:40:45 +0000 http://richardbushnell.net/index.php/2008/02/08/how-to-use-grouping-in-c-linq-syntax/#comment-66 Do you know how to get these results in VB? I'm trying to use LINQ syntax but I get IEnumerable's of anonymous types. I'm trying to translate this query: source.GroupBy(Of Boolean)(Function(x) x.MyBoolProperty). In C# it should be smth like source.GroupBy(x => x.MyBoolProperty). Perhaps you should mention that not all GroupBy overloads return IEnumerable of IGrouping.. ulu Do you know how to get these results in VB?

I’m trying to use LINQ syntax but I get IEnumerable’s of anonymous types. I’m trying to translate this query:
source.GroupBy(Of Boolean)(Function(x) x.MyBoolProperty).
In C# it should be smth like
source.GroupBy(x => x.MyBoolProperty).

Perhaps you should mention that not all GroupBy overloads return IEnumerable of IGrouping..

ulu

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