DataTable.Select("Bla='Blablabla'").Count Returns 'Count' is not a member of 'System.Array' Exception

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+1 Q:

DataTable.Select("Bla='Blablabla'").Count Returns 'Count' is not a member of 'System.Array' Exception

I'm trying to access the Count Property on the array of rows returned by the datatables select method, this is after converting the Web Project to 3.5

+3 A:

Use .Length instead.

Joel Coehoorn 2009-04-21 15:53:08

ok but the codebase already uses .count in alot of places and was originally working.... am I missing a reference or something

keyoke 2009-04-21 16:06:46

Odd.. arrays have never had a .Count property. I wonder if that used to be a 'hack' in the system that they had to remove to avoid conflicted with IEnumerable.count

Joel Coehoorn 2009-04-21 16:10:57

in msdn when looking at the System.Array members/properties if you select 2.0 as the framework there is no count property but if you select 3.5 it appears.

keyoke 2009-04-21 16:34:24

Because arrays implement IEnumerable, and in 3.5 IEnumerable and .Count extension.

Joel Coehoorn 2009-04-21 16:39:41

And you don't want to rely on that, because it means actually iterating over the array and counting the elements, rather than just looking it up.

Joel Coehoorn 2009-04-21 16:40:17

Just remember that .Length is 0-based and .Count is 1-based. If an Array contains [Steve|Tom|George] then .Length() will return 2 and .Count() will return 3.

STW 2009-04-21 19:32:57

@Yooder that's wrong.

Joel Coehoorn 2010-05-05 21:52:16

I was missing <add namespace="System.Linq"/> from my web.config

keyoke 2009-04-22 08:58:27

ansaurus

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DataTable.Select("Bla='Blablabla'").Count Returns 'Count' is not a member of 'System.Array' Exception

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