Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 259
  • Last Modified:

context menu on form : if no selected items on listview , how to handle the exception, i pass a value from the selecteditem to function

hi , i have a context menu on a listview.
the idea is for the user to right click on the listview , and then when the user clicks on the "Print" item on context menu,
i pass the selected items subitem to a function
but the problem is what to do when there is no item selected.
what i initially did was just have a empty exception but that's not professional and it took much longer when there was an error.


  Dim ID As Object
        Try
            ID = MyListview.SelectedItems(0).SubItems(1).Text
            If Not ID Is Nothing Then
               MyFunction(CInt(ID))
            End If
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try

this does not work, immediately from
try
 -->ID = ...

it goes to the error message telling me that "specified argument out of range"
"parameter name:index"
thanks!
0
jxharding
Asked:
jxharding
  • 6
  • 3
1 Solution
 
Fahad MukhtarDistinguished EngineerCommented:
This is the C# code i posted in the morning for a similar problem

          if (e.Button == MouseButtons.Right && listView1.GetItemAt(e.X,e.Y)!=null )
               {
                    ListViewItem lv = listView1.GetItemAt(e.X,e.Y);                    
                    lv.Selected = true;
                    Point spot = this.PointToClient(listView1.PointToScreen(new Point(e.X, e.Y)));
                    contextMenu1.Show(this, spot);
                    MessageBox.Show(lv.Text );
               }
0
 
jxhardingAuthor Commented:
hi desp, thing is i also use the file-->menu--> Print
when the user clicks on a item on the listview and then selects file --> print.
for that  reason only i think i have to steer clear of the mouse location.
thanks!
0
 
Fahad MukhtarDistinguished EngineerCommented:
heres VB.Net
        If e.Button = MouseButtons.Right And ListView2.GetItemAt(e.X, e.Y) Is Nothing Then

            Dim lv As ListViewItem = ListView2.GetItemAt(e.X, e.Y)
            lv.Selected = True
            Dim spot As Point = Me.PointToClient(ListView2.PointToScreen(New Point(e.X, e.Y)))
            contextMenu1.Show(Me, spot)
            MessageBox.Show(lv.Text)

        End If
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
Fahad MukhtarDistinguished EngineerCommented:
disregard the last comment!
0
 
Fahad MukhtarDistinguished EngineerCommented:
put this code in the Mouse up event of the list view..

        If e.Button = MouseButtons.Right And MyListview.GetItemAt(e.X, e.Y) Is Nothing Then
            Dim lv As ListViewItem = MyListview.GetItemAt(e.X, e.Y)
            lv.Selected = True
            ID = MyListview.SelectedItems(0).SubItems(1).Text
            MyFunction(CInt(ID))
        End If
0
 
jxhardingAuthor Commented:
hi desp,
i tried it ,and it works , its just i still get an error when no items are selected or when the listview is empty.
maybe i should do a check to see if there are any items on the listview , and then if there are
is there anyway to determine if one is actually selected?
thanks!
0
 
Fahad MukhtarDistinguished EngineerCommented:
put this check:

If MyListview.SelectedItems.Count > 0 Then
....
0
 
jxhardingAuthor Commented:
thanks desp!
0
 
Fahad MukhtarDistinguished EngineerCommented:
glad i could help
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

  • 6
  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now