Question

i have the following code which will get the max and min values from a list of type double

Dim sprices As List(Of Double) = grp.ProductGroups.AsEnumerable().[Select](Function(sm) sm.Field(Of Double)("sprice")).Distinct().ToList()

        Dim min As Integer = sprices.Min()
        Dim max As Integer = sprices.Max()

how ever in the first line i get the exception “Cannot cast DBNull.Value to type ‘System.Double’. Please use a nullable type.”
how can i avoid this or not add the DBNulls to the list?

Answer 1

One way is to use a nullable Double, which can be expressed as Double?:

Dim sprices As List(Of Double?) = grp.ProductGroups.AsEnumerable().[Select](Function(sm) sm.Field(Of Double?)("sprice")).Distinct().ToList()