Ciao, Ragazzi...

Sono nuovo del VB NET pertanto chiedo scusa in anticipo se scriverò qualche bestialità.

Dunqu ho un problema:

Ho una classe (DatagridView) che gestisce la pressione dle tasto Enter come se fosse il tasto 'Freccia Destra' e fin qui tutto ok.

quando inserisco il codice che corrisponde ad un fornitore, una query mi riempie la colonna 2 con il nominativo di quel fornitore e sposta il focus nella cella numero quattro.

Ora io vorrei che qualore per errore digitassi un codice inesistente, il focus noj si spostasse...

Mi hanno suggerito di usare HasRows, e così ho fatto, solo che non mi spiego perché La condizioen HasRows rimane sempre su 'False' e pertanto il focus viene spostato a prescindere dal risultato della query...

Questo è il codice, spero possiate aiutarmi:

Imports System.Data.OleDb
Imports System.Windows.Forms

Public Class DGVMod
Inherits DataGridView



Protected Overrides Sub OnCellValidated(ByVal e As System.Windows.Forms.DataGridViewCellEventArgs)

Try
rw = CurrentCell.RowIndex
cl = CurrentCell.ColumnIndex

Select Case cl

Case Is = 1

Dim cmd As New OleDb.OleDbCommand("SELECT FORNITORE FROM FORNITORI WHERE ID_FOR = '" & Item(1, rw).Value & "'", cn)
dr = cmd.ExecuteReader
If dr.HasRows And Item(11, rw).Value = 0 Then

Do While dr.Read
Item(2, rw).Value = dr.Item("FORNITORE")
Loop
dr.Close()

ElseIf dr.HasRows And Item(11, rw).Value > 0 Then
Do While dr.Read
Item(2, rw).Value = dr.Item("FORNITORE")
Loop
cmd = New OleDb.OleDbCommand("UPDATE VENDITE SET ID_FOR = " & Item(1, rw).Value & ", FORNITORE = '" & Item(2, rw).Value & "' WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
Else
MsgBox("CVCB")
dr.Close()
End If

Case Is = 3

sql = "select ARTICOLO, ALIQUOTA from ARTICOLI where ID_ART=?"
Dim cmd As New OleDb.OleDbCommand(sql, cn)
cmd.Parameters.AddWithValue("ID_ART", Item(3, rw).Value)
dr = cmd.ExecuteReader

If dr.HasRows And Item(11, rw).Value = 0 Then
Do While dr.Read
Item(4, rw).Value = dr.Item("ARTICOLO")
Item(12, rw).Value = dr.Item("ALIQUOTA")
Loop
dr.Close()

ElseIf dr.HasRows And Item(11, rw).Value > 0 Then
Do While dr.Read
Item(4, rw).Value = dr.Item("ARTICOLO")
Loop
cmd = New OleDb.OleDbCommand("UPDATE VENDITE SET ID_AR = " & Item(3, rw).Value & ", ARTICOLO = '" & Item(4, rw).Value & "' WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
Else
MsgBox("CVCB")
dr.Close()
End If

Case Is = 5
If Item(11, rw).Value > 0 Then
Dim cmd As New OleDb.OleDbCommand("UPDATE VENDITE SET COLLI = " & Item(5, rw).Value & " WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
End If

Case Is = 6

If Item(12, rw).Value > 0 Then
Item(12, rw).Value = Val(Item(12, rw).Value) + (Val(Form1.Iva_Text.Text) - Val(Item(12, rw).Value))
End If
Item(8, rw).Value = (Val(Item(6, rw).Value) * Val(Item(7, rw).Value)) + _
(Val(Item(6, rw).Value) * Val(Item(7, rw).Value)) / 100 * Item(12, rw).Value
If Item(11, rw).Value > 0 Then
Dim cmd As New OleDb.OleDbCommand("UPDATE VENDITE SET PESO = " & Item(6, rw).Value & ", PREZZO = " & Item(7, rw).Value & ", SUBTOTALE = " & Item(8, rw).Value & " WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
End If

Case Is = 7
'Dim aliq As Double
If Item(12, rw).Value > 0 Then
Item(12, rw).Value = Val(Item(12, rw).Value) + (Val(Form1.Iva_Text.Text) - Val(Item(12, rw).Value))
End If
Item(8, rw).Value = (Val(Item(6, rw).Value) * Val(Item(7, rw).Value)) + _
(Val(Item(6, rw).Value) * Val(Item(7, rw).Value)) / 100 * Item(12, rw).Value
If Item(11, rw).Value > 0 Then
Dim cmd As New OleDb.OleDbCommand("UPDATE VENDITE SET PESO = " & Item(6, rw).Value & ", PREZZO = " & Item(7, rw).Value & ", SUBTOTALE = " & Item(8, rw).Value & " WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
End If

Case Is = 9

sql = "select CLIENTE from CLIENTI where ID_CLI=?"
Dim cmd As New OleDb.OleDbCommand(sql, cn)
cmd.Parameters.AddWithValue("ID_CLI", Item(9, rw).Value)
dr = cmd.ExecuteReader

If dr.HasRows Then
Do While dr.Read
Item(10, rw).Value = dr.Item("CLIENTE")
Loop
dr.Close()
Else
Item(10, rw).Value = ""
MsgBox("qui ci scriverò qualcosa")
dr.Close()
End If

If Item(11, rw).Value > 0 Then
cmd = New OleDb.OleDbCommand("UPDATE VENDITE SET ID_CLI = " & Item(9, rw).Value & ", CLIENTE = '" & Item(10, rw).Value & "' WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
Else

Dim objCmd As OleDb.OleDbCommand
objCmd = New OleDb.OleDbCommand("Insert into VENDITE (DATA, ID_FOR, FORNITORE, ID_AR, ARTICOLO, COLLI ,PESO, PREZZO, SUBTOTALE, ID_CLI, CLIENTE, ALIQUOTA) Values (" & "'" & Item(0, rw).Value & "'" _
& ",'" & Item(1, rw).Value & "'" _
& ",'" & Item(2, rw).Value & "'" _
& ",'" & Item(3, rw).Value & "'" _
& ",'" & Item(4, rw).Value & "'" _
& ",'" & Item(5, rw).Value & "'" _
& ",'" & Item(6, rw).Value & "'" _
& ",'" & Item(7, rw).Value & "'" _
& ",'" & Item(8, rw).Value & "'" _
& ",'" & Item(9, rw).Value & "'" _
& ",'" & Item(10, rw).Value & "'" _
& ",'" & Item(12, rw).Value & "'" & ")", cn)

Dim LastID As Integer
objCmd.ExecuteNonQuery()

objCmd = New OleDb.OleDbCommand("SELECT @@IDENTITY", cn)

LastID = objCmd.ExecuteScalar()
Item(11, rw).Value = LastID


End If

End Select
Catch
MsgBox("Alcuni campi sono stati lasciati vuoti. Si prega di riempirli")
CurrentRow.DefaultCellStyle.BackColor = Color.Yellow
Finally
Item(0, rw).Value = Format(Now, "dd/MM/yyyy")

End Try


MyBase.OnCellValidated(e)

End Sub
Protected Overrides Sub OnKeyUp(ByVal e As System.Windows.Forms.KeyEventArgs)
If e.KeyCode = Keys.F4 Then
If Item(11, rw).Value > 0 Then
CurrentRow.Selected = True
Dim del As Integer = MsgBox("la riga n° " & CurrentCell.RowIndex + 1 & " verrà eliminata, continuare?", vbYesNo + vbExclamation + vbDefaultButton2, "Squarcio")
If del = DialogResult.Yes Then
Dim cmd As New OleDb.OleDbCommand("DELETE FROM VENDITE WHERE ID_VEN = " & Item(11, rw).Value, cn)
dr = cmd.ExecuteReader
dr.Close()
Rows.Remove(SelectedRows(0))
Else
CurrentRow.Selected = False
End If
End If
End If

Select Case cl
Case Is = 1
If Item(2, rw).Value = "" Then
CurrentCell = Item(1, rw)
End If
End Select


MyBase.OnKeyUp(e)
End Sub
<System.Security.Permissions.UIPermission( _
System.Security.Permissions.SecurityAction.LinkDem and, _
Window:=System.Security.Permissions.UIPermissionWi ndow.AllWindows)> _
Protected Overrides Function ProcessDialogKey( _
ByVal keyData As Keys) As Boolean



Dim key As Keys = keyData And Keys.KeyCode
rw = CurrentCell.RowIndex
cl = CurrentCell.ColumnIndex

If key = Keys.Enter Then

Try
Select Case cl
Case Is = 0
Return Me.ProcessRightKey(keyData)

Case Is = 1

Dim cmd As New OleDb.OleDbCommand("SELECT FORNITORE FROM FORNITORI WHERE ID_FOR = '" & Item(1, rw).Value & "'", cn) '& Griglia_Vendite.Item(11, rw).Value, cn)

dr = cmd.ExecuteReader
If dr.HasRows Then
CurrentCell = Item(2, rw)
Return Me.ProcessRightKey(keyData)
dr.Close()
Else
CurrentCell = Item(0, rw)
Return Me.ProcessRightKey(keyData)
dr.Close()
End If





Return MyBase.ProcessDialogKey(keyData)



End Function

<System.Security.Permissions.SecurityPermission( _
System.Security.Permissions.SecurityAction.LinkDem and, Flags:= _
System.Security.Permissions.SecurityPermissionFlag .UnmanagedCode)> _
Protected Overrides Function ProcessDataGridViewKey( _
ByVal e As System.Windows.Forms.KeyEventArgs) As Boolean

cl = CurrentCell.ColumnIndex
rw = CurrentCell.RowIndex



If e.KeyCode = Keys.Enter Then
Try
Select Case cl
Case Is = 0
Return Me.ProcessRightKey(e.KeyData)

Case Is = 1

dr = cmd.ExecuteReader
If dr.HasRows Then
CurrentCell = Item(2, rw)
Return Me.ProcessRightKey(e.KeyData)
dr.Close()
Else
CurrentCell = Item(0, rw)
Return Me.ProcessRightKey(e.KeyData)
dr.Close()
End If


Case Is = 9
If Rows.Count - 1 = rw Then
Rows.Add()
CurrentCell = Item(0, rw + 1)
Return Me.ProcessRightKey(e.KeyData)

Else
CurrentCell = Item(0, rw + 1)
Return Me.ProcessRightKey(e.KeyData)
End If
Dim u As Integer
Form1.Tot_Text.Text = 0
For u = 0 To Rows.Count - 1

Form1.Tot_Text.Text = Val(Item(8, u).Value) + Val(Form1.Tot_Text.Text)

Next
End Select
Catch
End Try
End If

Return MyBase.ProcessDataGridViewKey(e)


End Function
End Class