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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 64

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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LVL 64

Expert Comment

by:Fernando Soto
ID: 39771354
Please see my post and how I implemented the code.
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LVL 64

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 2000 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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