LINQ: query returns list of empty objects

Question

I have a query that 'selects' object of a type:

Dim l as IList(Of Foo) = (From dataRow As DataRow In table.Select()
                          Where CStr(dataRow("Column1")) = "A"
                          Select New Foo(CStr(dataRow("Column1")), _
                                         CStr(dataRow("Column2")))).ToList()

What's happening is that if i set a break-point to the constructor of Foo and step, the constructor is hit and the parameters are loaded with the arguments. However, l has empty Foo objects (the members in every object are Nothing). What could be happening here?

It sounds like Foo isn't storing the values of the parameters to the constructor. Can you post the constructor as well? — davisoa
– davisoa, Commented May 3, 2012 at 15:09

pylover · Accepted Answer · 2012-05-03 15:11:31Z

1

Change your query to :

Dim l as IList(Of Foo) = (From dataRow As DataRow In table..AsEnumerable()
                          Where datarow.Field(of String)("Column1") = "A" 
                          Select New Foo(datarow.Field(of String)("Column1"), _
                                         datarow.Field(of String)("Column1"))).ToList()

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answered May 3, 2012 at 15:11

pylover

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