Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

sum property of observable collection

Posted on 2014-01-10
7
964 Views
Last Modified: 2016-02-10
Hi guys,

I am trying to sum a property in my observable collection.  

Tried below using LINQ and not working, any idea what I'm doing wrong?

                var summationResult =
                        from p in BreakdownClass
                        select into g
                        {
                            previousPos = g.Sum(p => p.tPrevPos),
                            previousPL = g.Sum(p => p.tPrevPL),
                            topPos = g.Sum(p => p.tTopTrd),
                            topPL = g.Sum(p => p.tTopPL),
                            netPos = g.Sum(p => p.tNetPos),
                            netPL = g.Sum(p => p.tNetPL)
                        };

Open in new window

0
Comment
Question by:solarissf
  • 4
  • 3
7 Comments
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 39771341
Hi solarissf;

Give it a try like this.

var summationResult =
    from p in BreakdownClass 
    group p by "OneGroup" into g
    select new
    {
        previousPos = g.Sum(p => p.tPrevPos),
        previousPL = g.Sum(p => p.tPrevPL),
        topPos = g.Sum(p => p.tTopTrd),
        topPL = g.Sum(p => p.tTopPL),
        netPos = g.Sum(p => p.tNetPos),
        netPL = g.Sum(p => p.tNetPL)
    };

Open in new window

0
 

Author Comment

by:solarissf
ID: 39771347
that's the catch... I don't want to group by anything... I just want to sum up some properties without grouping
0
 

Author Comment

by:solarissf
ID: 39771349
something like this..
but does not work

                var summationResult =
                    
                    BreakdownClass.Sum(x => x.tPrevPL),
                    BreakdownClass.Sum(x => x.tPrevPos),
                    ;

Open in new window

0
The New “Normal” in Modern Enterprise Operations

DevOps for the modern enterprise offers many benefits — increased agility, productivity, and more, but digital transformation isn’t easy, especially if you’re not addressing the right issues. Register for the webinar to dive into the “new normal” for enterprise modern ops.

 
LVL 63

Expert Comment

by:Fernando Soto
ID: 39771354
Please see my post and how I implemented the code.
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 39771368
Each iteration of the query returns one record so either you group in the query or you iterate through all returned records and sum them up.
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39771400
This should also work if you wish to go that route.

var summationResult = new
    {               
        tPrevPL = BreakdownClass.Sum(x => x.tPrevPL),
        tPrevPos = BreakdownClass.Sum(x => x.tPrevPos)
    };

Open in new window

0
 

Author Comment

by:solarissf
ID: 39771406
yepp... I just figured it out and it was the same as your last post... thanks!!!
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In my previous two articles we discussed Binary Serialization (http://www.experts-exchange.com/A_4362.html) and XML Serialization (http://www.experts-exchange.com/A_4425.html). In this article we will try to know more about SOAP (Simple Object Acces…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question