Entity framework - Return to list error? - vb.net

Question

I got the problem - return to list from the entity framework. I need to return as a object. Here is my code:
Public Function GetHardwareDetail() As List(Of HardwareDetailApp)
Dim idList As New List(Of String)
Dim Data = (From p In DB.TT_HARDWARE Select New HardwareDetailApp With {.InternalNum = p.INTERNAL_NUM, .Description = p.DESCRIPTION, .TerminalModel = p.HARDWARE_MODEL, .HardwareInternalNum = p.HARDWARE_ID, .Status = p.ISACTIVE, .Firmware = Nothing, .SerialNum = Nothing})
If Data.Count > 0 Then
For Each row In Data
idList.Add(row.InternalNum)
Next
End If
Dim Data2 = (From p In DB.TT_TERMINAL_HARDWARE Where idList.Contains(p.HARDWARE_INTERNAL_NUM)
Select New HardwareDetailApp With
{.Firmware = p.HARDWARE_FIRMWARE, .SerialNum = p.HARDWARE_SERIAL_NUM, .InternalNum = Data.FirstOrDefault.InternalNum, .Description = Data.FirstOrDefault.Description, .TerminalModel = Data.FirstOrDefault.TerminalModel, .HardwareInternalNum = Data.FirstOrDefault.HardwareInternalNum, .Status = Data.FirstOrDefault.Status})
Return Data2.ToList
End Function
This is the error which I get:
The type 'HardwareDetailApp' appears in two
structurally incompatible initializations within a single LINQ to
Entities query. A type can be initialized in two places in the same
query, but only if the same properties are set in both places and
those properties are set in the same order.

Answer 1

in your code, you have created from HardwareDetailApp in two place, in every creation of that you must set the same property with same order.
for example if in linq to entity you Select something like:
Place1:
...
Select new MyClass()
{
PropA: 1,
}
...
and in that query you need to another Select from MyClass but with some other properties like PropB, Like:
Place2:
...
Select new MyClass()
{
PropB: 2,
}
...
you must change all Select from MyClass into same, and set the properties you dont need to them, to its default, and set the properties in same order like:
Place1:
...
Select new MyClass()
{
PropA: 1,
PropB: default(int),
}
...
and
Place2:
...
Select new MyClass()
{
PropA: default(int),
PropB: 2,
}
...
my codes are in c#..
in this part of your code Dim Data = (From p In DB.TT_HARDW .... try to set Firmware and SerialNum at first like the second select, (i have not checked other properties carefully)