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Iterating through a ListBox in VB.NET VS 2005objListBox.DataSource = tbl objListBox.DisplayMember = "ContactName" objListBox.ValueMember = "ContactID" ------------------------------------ On my form, I have a multi-select listbox and I would like to select a few items. So If my listbox contains: CA, NV, OR, WA, AZ and I choose CA and NV, How can I get get those items? I tried something like dim itm as object for each itm in objlistbox.selecteditems console.writeline(itm) next but it doesn't work. Why is this so hard to get the selected items in a listbox? Thanks In article <#dG2BOl7GHA.1***@TK2MSFTNGP04.phx.gbl>, he***@yada.com
says... Show quoteHide quote > I have a listbox on a Windows form and it is bound using the following code: What do you mean "it doesn't work"? Do you get an error?> > objListBox.DataSource = tbl > > objListBox.DisplayMember = "ContactName" > > objListBox.ValueMember = "ContactID" > > ------------------------------------ > > On my form, I have a multi-select listbox and I would like to select a few > items. So If my listbox contains: CA, NV, OR, WA, AZ > > and I choose CA and NV, > > > > How can I get get those items? > > I tried something like > > dim itm as object > > for each itm in objlistbox.selecteditems > > console.writeline(itm) > > next > > > > but it doesn't work. I get the following error:
Argument 'Prompt' cannot be converted to type 'String'. but I have tried other things and they don't work also. For example I tried console.writeline(objlist.selecteditem) and tried to list objlist.text and many other things but just can't display the State or it's value. If I could see some working code on how to do this that would be great. I'm not necessarily in need of fixing what I have, I would like to get an example of something that someone already has that works. Thanks. Show quoteHide quote "Patrick Steele" <patr***@mvps.org> wrote in message news:MPG.1f989acbef6948db9896b0@msnews.microsoft.com... > In article <#dG2BOl7GHA.1***@TK2MSFTNGP04.phx.gbl>, he***@yada.com > says... >> I have a listbox on a Windows form and it is bound using the following >> code: >> >> objListBox.DataSource = tbl >> >> objListBox.DisplayMember = "ContactName" >> >> objListBox.ValueMember = "ContactID" >> >> ------------------------------------ >> >> On my form, I have a multi-select listbox and I would like to select a >> few >> items. So If my listbox contains: CA, NV, OR, WA, AZ >> >> and I choose CA and NV, >> >> >> >> How can I get get those items? >> >> I tried something like >> >> dim itm as object >> >> for each itm in objlistbox.selecteditems >> >> console.writeline(itm) >> >> next >> >> >> >> but it doesn't work. > > What do you mean "it doesn't work"? Do you get an error? > > -- > Patrick Steele > http://weblogs.asp.net/psteele Henry,
This works for me in VS2003: for each itm as DataRowView in objlistbox.selecteditems console.writeline(itm("ContactName")) next Kerry Moorman Show quoteHide quote "Henry Jones" wrote: > I get the following error: > Argument 'Prompt' cannot be converted to type 'String'. > > but I have tried other things and they don't work also. > > For example I tried console.writeline(objlist.selecteditem) and tried to > list objlist.text and many other things but just can't display the State or > it's value. > > If I could see some working code on how to do this that would be great. I'm > not necessarily in need of fixing what I have, I would like to get an > example of something that someone already has that works. > > Thanks. > > > "Patrick Steele" <patr***@mvps.org> wrote in message > news:MPG.1f989acbef6948db9896b0@msnews.microsoft.com... > > In article <#dG2BOl7GHA.1***@TK2MSFTNGP04.phx.gbl>, he***@yada.com > > says... > >> I have a listbox on a Windows form and it is bound using the following > >> code: > >> > >> objListBox.DataSource = tbl > >> > >> objListBox.DisplayMember = "ContactName" > >> > >> objListBox.ValueMember = "ContactID" > >> > >> ------------------------------------ > >> > >> On my form, I have a multi-select listbox and I would like to select a > >> few > >> items. So If my listbox contains: CA, NV, OR, WA, AZ > >> > >> and I choose CA and NV, > >> > >> > >> > >> How can I get get those items? > >> > >> I tried something like > >> > >> dim itm as object > >> > >> for each itm in objlistbox.selecteditems > >> > >> console.writeline(itm) > >> > >> next > >> > >> > >> > >> but it doesn't work. > > > > What do you mean "it doesn't work"? Do you get an error? > > > > -- > > Patrick Steele > > http://weblogs.asp.net/psteele > > > You are on the right track, but you have to remember that the SelectedItems
collection is a collection of ListItems. Each selected item is a ListItem that contains a string and therfore you need to 'turn' the ListItem into a string before you can display the correct value. console.writeline(ctype(itm, string)) Show quoteHide quote "Henry Jones" <he***@yada.com> wrote in message news:%23dG2BOl7GHA.1256@TK2MSFTNGP04.phx.gbl... >I have a listbox on a Windows form and it is bound using the following >code: > > objListBox.DataSource = tbl > > objListBox.DisplayMember = "ContactName" > > objListBox.ValueMember = "ContactID" > > ------------------------------------ > > On my form, I have a multi-select listbox and I would like to select a few > items. So If my listbox contains: CA, NV, OR, WA, AZ > > and I choose CA and NV, > > > > How can I get get those items? > > I tried something like > > dim itm as object > > for each itm in objlistbox.selecteditems > > console.writeline(itm) > > next > > > > but it doesn't work. Why is this so hard to get the selected items in a > listbox? > > > > Thanks > > Sorry, I didn't read you post properly.
Because your ListBox is bound, each item is a reference to a row in tbl. In this case you need to use SelectedIndicies instead of SelectedItems and retrieve the value from tbl: For _i as Integer = 0 to objlistbox.SelectedIndicies.Count Console.WriteLine(tbl.Rows(objlistbox.SelectedIndicies(_i))("ContactName")) Next Each item in SelectedIndicies effectively gives you the row number in the source. Show quoteHide quote "Henry Jones" <he***@yada.com> wrote in message news:%23dG2BOl7GHA.1256@TK2MSFTNGP04.phx.gbl... >I have a listbox on a Windows form and it is bound using the following >code: > > objListBox.DataSource = tbl > > objListBox.DisplayMember = "ContactName" > > objListBox.ValueMember = "ContactID" > > ------------------------------------ > > On my form, I have a multi-select listbox and I would like to select a few > items. So If my listbox contains: CA, NV, OR, WA, AZ > > and I choose CA and NV, > > > > How can I get get those items? > > I tried something like > > dim itm as object > > for each itm in objlistbox.selecteditems > > console.writeline(itm) > > next > > > > but it doesn't work. Why is this so hard to get the selected items in a > listbox? > > > > Thanks > > Thanks for the code to iterate through the listbox. Your suggestions
worked! H Show quoteHide quote "Henry Jones" <he***@yada.com> wrote in message news:%23dG2BOl7GHA.1256@TK2MSFTNGP04.phx.gbl... >I have a listbox on a Windows form and it is bound using the following >code: > > objListBox.DataSource = tbl > > objListBox.DisplayMember = "ContactName" > > objListBox.ValueMember = "ContactID" > > ------------------------------------ > > On my form, I have a multi-select listbox and I would like to select a few > items. So If my listbox contains: CA, NV, OR, WA, AZ > > and I choose CA and NV, > > > > How can I get get those items? > > I tried something like > > dim itm as object > > for each itm in objlistbox.selecteditems > > console.writeline(itm) > > next > > > > but it doesn't work. Why is this so hard to get the selected items in a > listbox? > > > > Thanks > > 
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