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sum property of observable collection

Posted on 2014-01-10
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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)
                        };

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Question by:solarissf
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7 Comments
 
LVL 62

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)
    };

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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
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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),
                    ;

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3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 62

Expert Comment

by:Fernando Soto
ID: 39771354
Please see my post and how I implemented the code.
0
 
LVL 62

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.
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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)
    };

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Author Comment

by:solarissf
ID: 39771406
yepp... I just figured it out and it was the same as your last post... thanks!!!
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3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

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