Ok, esta es una pregunta bastante provocadora. He hecho un montón de acopio de datos en el pasado, y normalmente usaría un diccionario para mantener todos los valores únicos, y luego casarlos después.
Pediste LINQ, ahora no puedo pensar en un modo de un solo paso para hacer esto, así que tengo esto en su lugar, en VB ...
Private Class FlatObj
Public Property G1_ID As Integer
Public Property G1_CellName As String
Public Property G2_ContainerID As Integer
Public Property G2_ID As Integer
Public Property G2_SerialNumber As Integer
Public Property G3_ID As Integer
Public Property G3_PrinterName As String
End Class
Private Class G1
Public Property ID As Integer
Public Property CellName As String
Public Property Containers As New List(Of G2)()
Public Property PrinterNames As New List(Of G3)()
Public Overrides Function Equals(ByVal obj As Object) As Boolean
Return ID.Equals(CType(obj, G1).ID)
End Function
Public Overrides Function GetHashCode() As Integer
Return ID.GetHashCode()
End Function
End Class
Private Class G2
Public Property fID As Integer
Public Property ContainerID As Integer
Public Property SerialNumber As Integer
Public Overrides Function Equals(ByVal obj As Object) As Boolean
Return ContainerID.Equals(CType(obj, G2).ContainerID)
End Function
Public Overrides Function GetHashCode() As Integer
Return ContainerID.GetHashCode()
End Function
End Class
Private Class G3
Public Property fID As Integer
Public Property PrinterName As String
Public Overrides Function Equals(ByVal obj As Object) As Boolean
Return PrinterName.Equals(CType(obj, G3).PrinterName)
End Function
Public Overrides Function GetHashCode() As Integer
Return PrinterName.GetHashCode()
End Function
End Class
Dim fromDb As New List(Of FlatObj) From
{
New FlatObj() With {.G1_ID = 1971, .G1_CellName = "Default Cell", .G2_ContainerID = 1935, .G2_ID = 1971, .G2_SerialNumber = 1101929, .G3_ID = 1971, .G3_PrinterName = "PBG-PrtEmulator1"},
New FlatObj() With {.G1_ID = 1971, .G1_CellName = "Default Cell", .G2_ContainerID = 1936, .G2_ID = 1971, .G2_SerialNumber = 1101930, .G3_ID = 1971, .G3_PrinterName = "PBG-PrtEmulator1"},
New FlatObj() With {.G1_ID = 1971, .G1_CellName = "Default Cell", .G2_ContainerID = 2189, .G2_ID = 1971, .G2_SerialNumber = 1102183, .G3_ID = 1971, .G3_PrinterName = "PBG-PrtEmulator1"}
}
Dim g1s = fromDb.Select(Function(x) New G1 With
{
.ID = x.G1_ID,
.CellName = x.G1_CellName
}).Distinct().ToList()
Dim g2s = fromDb.Select(Function(x) New G2 With
{
.fID = x.G2_ID,
.ContainerID = x.G2_ContainerID,
.SerialNumber = x.G2_SerialNumber
}).Distinct().ToLookup(Function(x) x.fID)
Dim g3s = fromDb.Select(Function(x) New G3 With
{
.fID = x.G3_ID,
.PrinterName = x.G3_PrinterName
}).Distinct().ToLookup(Function(x) x.fID)
g1s.ForEach(Sub(g)
g.Containers.AddRange(g2s(g.ID))
g.PrinterNames.AddRange(g3s(g.ID))
End Sub)
en cuenta que un buen montón de la el trabajo ha pasado por las extensiones Distinct() y ToLookup(). Espero que esto ayude, me gustaría ver si hay una forma más "LINQy": D
Solo para aclarar ... ¿Desea una jerarquía que se parece a un objeto - Cell> con Cell.Containers, Cell.SerialNumbers, Cell.PrinterNames (como colecciones)? – Tom
¿Esto es Linq a Sql, Linq a EF, Linq a objetos o algo más? –
@Tom - Quiero una jerarquía que se parece a Cell -> Cell.Containers and Cell -> PrinterNames. La columna del número de serie es una propiedad del contenedor. –