Modifier attribut avec Xpath

Bonjour,
je voudrais savoir comment modifier un attribut dans un xml via xpath

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
<?xml version="1.0" standalone="yes"?>
<DocumentElement>
  <DYN_cyclist>
    <IDcyclist>5</IDcyclist>
    <gene_sz_lastname>Bruseghin</gene_sz_lastname>
    <gene_sz_firstname>Marzio</gene_sz_firstname>
    <gene_sz_firstlastname>M.Bruseghin</gene_sz_firstlastname>
    <fkIDteam>1</fkIDteam>
    <charac_i_plain>70</charac_i_plain>
  </DYN_cyclist>
  <DYN_cyclist>
    <IDcyclist>6</IDcyclist>
    <gene_sz_lastname>García Acosta</gene_sz_lastname>
    <gene_sz_firstname>José Vicente</gene_sz_firstname>
    <gene_sz_firstlastname>J.García Acosta</gene_sz_firstlastname>
    <fkIDteam>1</fkIDteam>
    <charac_i_plain>73</charac_i_plain>
    <capital_f_plain>0</capital_f_plain>
  </DYN_cyclist>
....
</DocumentElement>

voila le code VB.NET abrégé

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
 
Imports System.Xml
Imports System.Xml.XPath
Imports System.IO
 
Public Class Form1
 
    Dim cyclist As XPathDocument = New XPathDocument("C:\Users\shsb\Documents\Visual Studio 2010\Projects\XML\XML\Export\DYN_cyclist.xml")
    Dim idcyclist As XPathDocument = New XPathDocument("C:\Users\shsb\Documents\Visual Studio 2010\Projects\XML\XML\Export\DYN_cyclist.xml")
    Dim nav_cyclist As XPathNavigator = cyclist.CreateNavigator
    Dim nav_idcyclist As XPathNavigator = cyclist.CreateNavigator
    Dim iterCycliste As XPathNodeIterator = nav_cyclist.Select("DocumentElement/DYN_cyclist")
 
 
    Private Sub ListView1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged
'quand je sélectionne un cycliste sa note en plaine apparait dans un NumeriqueUpDown 
 
        ide = ListView1.SelectedItems(0).Text
 
 
        Dim iteridCycliste As XPathNodeIterator = nav_idcyclist.Select("DocumentElement/DYN_cyclist[IDcyclist=" & ide & "]")
 
        While iteridCycliste.MoveNext
 
            Me.Plaine.Value = iteridCycliste.Current.SelectSingleNode("charac_i_plain").Value
 
        End While
 
 
    End Sub
 
 
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
 
        ide = ListView1.SelectedItems(0).Text
'Je veux que quand je modifie le NumeriqueUpDwon ca modifie la valeur de charac_i_plain
 
        Dim iteridCycliste As XPathNodeIterator = nav_idcyclist.Select("DocumentElement/DYN_cyclist[IDcyclist=" & ide & "]")
 
        While iteridCycliste.MoveNext
 
            iteridCycliste.Current.SelectSingleNode("charac_i_plain").SetValue(Me.Plaine.Text) ' mais ça ne marche pas
 
 
        End While
 
    End Sub

comment faut il procéder ?

-----

Je voudrais aussi savoir comment charger une image en TGA dans un Picturebox, il faut certainement importer une lib mais je ne sais pas la quelle

Merci