C# - LINQ To SQL Group People By Age?

Nov 3, 2011

Sample in C# and VB.NET are OK.

I have a table "People" with the following columns:

-FullName (nvarchar not null)
-DOB (datetime null)

I want to write a LINQ to SQL to group the people by age, like following result:

Age 19: 4 ppl
Age 20: 5 ppl
Age 21: 6 ppl
Here's my try:
Dim query = From ppl In db.People _
Select New With {.Age = DateTime.Now.Year - CDate(ppl.DOB).Year, .CountAge = ppl.Count}

Notice that there are no DOB record for some people in the tables, so these shall not be included. The DOB column has record like this 1982-10-24 10:12:45 AM because it's a DateTime column.

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Here's the type information:

Debug.Print(query.GetType.ToString)

Returns:

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and the inner type:

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So, armed with this information, here's the declaration used:

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