Adding object variables from a list

Question

the objects belong to a list which calls an external object class

I would like to simplify the following line of code

int TotalObjectVarN3 = (Object1.variable3 + Object2.variable3 + Object3.variable3 + Object3.variable3);

If the objects were in a collection (e.g. a List<MyClass>), you can use LINQ: myCollection.Sum(o => o.variable3) or a corresponding loop — Klaus Gütter
– Klaus Gütter, Commented Nov 13, 2021 at 11:50

Donut · Accepted Answer · 2021-11-13 11:56:48Z

2

This overload of System.Linq.Enumerable.Sum should work nicely for you:

Computes the sum of the sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

In this case, the "transform function" would be a Func<TSource, Int32> that returns the value of the variable3 property for the item (e.g. obj => obj.variable3).

You could use it like this:

int TotalObjectVarN3 = new []{ Object1, Object2, Object3 }.Sum(obj => obj.variable3);

answered Nov 13, 2021 at 11:56

Donut

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MsnimROD · Accepted Answer · 2021-11-13 12:29:17Z

0

This one does it using LINQ

int TotalObjectVarN3 = MyList.Sum(o => o.variable3):

answered Nov 13, 2021 at 12:29

MsnimROD

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Ran Turner · Accepted Answer · 2021-11-13 12:59:20Z

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Using Select is an option followed by the Sum method. Select Projects each element of a sequence into a new form.

list.Select(i => i.variable3).Sum();

More about Select - https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.select?view=net-5.0

answered Nov 13, 2021 at 12:59

Ran Turner

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