Linq GroupBy - how to specify the grouping key at runtime?
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by toasteroven
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Published on 2010-05-26T16:00:23Z
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2010/05/26
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is there a good way to do a Linq GroupBy
where the grouping key is determined at runtime? e.g. I want the grouping key to be built from a user-selected list of fields - can you do this? I know I can do it easily if I convert everything to a table of strings, but I was wondering if there was an elegant or clever way to accomplish this otherwise.
class Item
{
public int A, B;
public DateTime D;
public double X, Y, Z;
}
I have a List<Item>
called data
. I want to do things like retrieve the sum of X
grouped by A
, or the sums of X
, Y
, and Z
, grouped by A
and B
. but what fields go into the grouping should be able to be specified at runtime in some way.
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