Dim tablo 'mémorise
Private Sub Combobox1_Change()
Dim x$, i&, n&, a()
ComboBox2.Clear
If ComboBox1.ListIndex = -1 Then Exit Sub
x = ComboBox1
For i = 1 To UBound(tablo)
If tablo(i, 2) = x Then
n = n + 1
ReDim Preserve a(1 To n)
a(n) = tablo(i, 1)
End If
Next
tri a, 1, n
ComboBox2.List = a
End Sub
Private Sub UserForm_Initialize()
Dim d As Object, i&, a
tablo = Sheets("Feuil1").Range("B2", Range("C" & Rows.Count).End(xlUp)(2))
Set d = CreateObject("Scripting.Dictionary")
For i = 1 To UBound(tablo)
If tablo(i, 2) <> "" Then d(tablo(i, 2)) = ""
Next
If d.Count Then
a = d.keys
tri a, 0, UBound(a)
ComboBox1.List = a
End If
End Sub
Sub tri(a, gauc, droi) ' Quick sort
Dim ref, g, d, temp
ref = a((gauc + droi) \ 2)
g = gauc: d = droi
Do
Do While a(g) < ref: g = g + 1: Loop
Do While ref < a(d): d = d - 1: Loop
If g <= d Then
temp = a(g): a(g) = a(d): a(d) = temp
g = g + 1: d = d - 1
End If
Loop While g <= d
If g < droi Then Call tri(a, g, droi)
If gauc < d Then Call tri(a, gauc, d)
End Sub