ListView [RESOLVED]

[twisted]

I have a listview box with 10 items in it. How do I create a statement saying if you select no items then show message, if you select items then message show, the items that were selected. Thanks! I know the command for show message, but can't figure out the if parts.

For emaple:

If lstParts.SelectedItems = None selected then display an Error Message

If lstParts.SelectedItems are selected then display a Message with those selected items.

[CyberHawke]

simple,

Dim sbMessage As System.Text.StringBuilder
Dim liTemp As ListViewItem
If lstParts.SelectedItems.Count > 0 Then
    sbMessage.Append("You chose the following items").Append(vbCrLf)
    For Each liTemp In lstParts.Items
         If liTemp.Selected = True Then sbMessage.Append(liTemp.Text).Append(vbCrLf)
    Next
    MessageBox.Show(sbMessage.ToString)
Else
    MessageBox.Show("Show some other message")
End If

Hope this helps

[alextyx]

You can test the condition in this way:

 If Me.LswScadenze.SelectedItems.Count > 0 Then

else  
      
 End If

If Count > 0 at least one item is selected.

This solve your problem?
Good job

[twisted]

First part works great! But how do I get the second message (when items are selected) to show the items that have been selected. Say my items are arm, leg, and hand. And when I select arm and hand I want the message to say You have selected arm and hand.

[CyberHawke]

I updated my original message, check it out

[twisted]

Originally posted by CyberHawke
simple,

Dim sbMessage As System.Text.StringBuilder
Dim liTemp As ListViewItem
If lstParts.SelectedItems.Count > 0 Then
    sbMessage.Append("You chose the following items").Append(vbCrLf)
    For Each liTemp In lstParts.Items
         If liTemp.Selected = True Then sbMessage.Append(liTemp.Text).Append(vbCrLf)
    Next
    MessageBox.Show(sbMessage.ToString)
Else
    MessageBox.Show("Show some other message")
End If

Hope this helps

Didn't work out right! The first part did, but when I select items I end up with an error.

An unhandled exception of type 'System.NullReferenceException' occurred in WindowsApplication1.exe

Additional information: Object reference not set to an instance of an object.

[twisted]

Here is what I am trying to build

[twisted]

Ok this is what I got so far, but need the items in my ListView that are selected to be displayed in my text box. Here's my code..

If lstParts.SelectedItems.Count = 0 Then
            MessageBox.Show("You did not select any items", "Error")
            Exit Sub
        End If
        If lstParts.SelectedItems.Count > 0 Then
            txtLoop.Text = "You have selected: [COLOR=RED]THE ITEMS THAT WERE SELECTED[/COLOR]."
        End If

[CyberHawke]

Sorry, I left out a key word in one of the declarations
The word new is required when declaring an instance of the stringbuilder class, or any other for that matter...

Dim sbMessage As New System.Text.StringBuilder
Dim liTemp As ListViewItem
If lstParts.SelectedItems.Count > 0 Then
    sbMessage.Append("You chose the following items").Append(vbCrLf)
    For Each liTemp In lstParts.Items
         If liTemp.Selected = True Then sbMessage.Append(liTemp.Text).Append(vbCrLf)
    Next
    MessageBox.Show(sbMessage.ToString)
Else
    MessageBox.Show("Show some other message")
End If

[twisted]

Originally posted by CyberHawke
Sorry, I left out a key word in one of the declarations
The word new is required when declaring an instance of the stringbuilder class, or any other for that matter...

Dim sbMessage As New System.Text.StringBuilder
Dim liTemp As ListViewItem
If lstParts.SelectedItems.Count > 0 Then
    sbMessage.Append("You chose the following items").Append(vbCrLf)
    For Each liTemp In lstParts.Items
         If liTemp.Selected = True Then sbMessage.Append(liTemp.Text).Append(vbCrLf)
    Next
    MessageBox.Show(sbMessage.ToString)
Else
    MessageBox.Show("Show some other message")
End If

Now it works perfect! The only problem I have is I want to keep the "Show some other message", but not the "You chose the following items". Instead of a Message Box for this one I want it to show up in a text box. Saying "You have selected: arm, hand, and foot." If that's what they select. Would I just change the one line:
MessageBox.Show(sbMessage.ToString)??

EDIT: I went ahead and put txtLoop.Text = (sbMessage.ToString)
Now that it works I don't think I can use it. I believe I have to return these values using Do While, Do Until, and For Next statements.
It works great! One other question is DOES THIS use a text box for the loop results, and if so, how did they make it that size, b/c mine won't let me change the height??

[twisted]

Another problem I found:

If I select any parts then my Message works, but after I select parts then go back and don't select parts my Message doesn't come up. It's like it is storing the times Parts have been selected and after the first time it's greater then 0 so it doesn't work.

[CyberHawke]

one word here "CODE" as in I need to see some...

If you are attempting to not have any items in the list selected then I suggest you try clearing the selecteditems collection.

lstParts.SelectedItems.Clear

[twisted]

Private Sub btnWhile_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnWhile.Click
        Dim sbMessage As New System.Text.StringBuilder
        Dim liTemp As ListViewItem
        If lstParts.SelectedItems.Count > 0 Then
            sbMessage.Append("This is a Do While loop and you chose the following items:").Append(vbCrLf)
            For Each liTemp In lstParts.Items
                If liTemp.Selected = True Then sbMessage.Append(liTemp.Text).Append(vbCrLf)
            Next
            txtLoop.Text = (sbMessage.ToString)
        Else
            MessageBox.Show("You did not select any items", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Exit Sub
        End If
 
    End Sub

Right now, how do I make this a Do...While statement while mainting the same stuff? Also, how do I get my text box for the Loop Results to look like this? Is that even a text box??

[CyberHawke]

yeah, it's a TextBox inside a GroupBox with the enabled property set to false and the backcolor property set to Control

[twisted]

Well I got the GroupBox and Textbox inside it but I can change the height of the Textbox it's just default right now, but the width is perfect and let me adjust it fine.

[CyberHawke]

Set the multiline property to true

[twisted]

HELL YEAH!! Thanks man!