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To select an item in a ListBox, we can use the SetSelect method that takes an item index and a true or false value where the true value represents the item to be selected. The following code snippet sets a ListBox to allow multiple selection and selects the second and third items in the list: listBox1.
Choose Multiple Items from ListboxOn the worksheet, click on a cell that has a drop down list. The VBA listbox pops up automatically, and shows all the choices from the cell's drop down list. Add a check mark to one or more of the items in the list box. When you're finished selecting items, click the OK button.
public void MoveUp()
{
MoveItem(-1);
}
public void MoveDown()
{
MoveItem(1);
}
public void MoveItem(int direction)
{
// Checking selected item
if (listBox1.SelectedItem == null || listBox1.SelectedIndex < 0)
return; // No selected item - nothing to do
// Calculate new index using move direction
int newIndex = listBox1.SelectedIndex + direction;
// Checking bounds of the range
if (newIndex < 0 || newIndex >= listBox1.Items.Count)
return; // Index out of range - nothing to do
object selected = listBox1.SelectedItem;
// Removing removable element
listBox1.Items.Remove(selected);
// Insert it in new position
listBox1.Items.Insert(newIndex, selected);
// Restore selection
listBox1.SetSelected(newIndex, true);
}
UPD 2020-03-24: Extension class for simple reuse and it also supports CheckedListBox (if CheckedListBox is not needed for you, please remove appropriate lines of code). Thanks @dognose and @Chad
public static class ListBoxExtension
{
public static void MoveSelectedItemUp(this ListBox listBox)
{
_MoveSelectedItem(listBox, -1);
}
public static void MoveSelectedItemDown(this ListBox listBox)
{
_MoveSelectedItem(listBox, 1);
}
static void _MoveSelectedItem(ListBox listBox, int direction)
{
// Checking selected item
if (listBox.SelectedItem == null || listBox.SelectedIndex < 0)
return; // No selected item - nothing to do
// Calculate new index using move direction
int newIndex = listBox.SelectedIndex + direction;
// Checking bounds of the range
if (newIndex < 0 || newIndex >= listBox.Items.Count)
return; // Index out of range - nothing to do
object selected = listBox.SelectedItem;
// Save checked state if it is applicable
var checkedListBox = listBox as CheckedListBox;
var checkState = CheckState.Unchecked;
if (checkedListBox != null)
checkState = checkedListBox.GetItemCheckState(checkedListBox.SelectedIndex);
// Removing removable element
listBox.Items.Remove(selected);
// Insert it in new position
listBox.Items.Insert(newIndex, selected);
// Restore selection
listBox.SetSelected(newIndex, true);
// Restore checked state if it is applicable
if (checkedListBox != null)
checkedListBox.SetItemCheckState(newIndex, checkState);
}
}
private void UpClick()
{
// only if the first item isn't the current one
if(listBox1.ListIndex > 0)
{
// add a duplicate item up in the listbox
listBox1.AddItem(listBox1.Text, listBox1.ListIndex - 1);
// make it the current item
listBox1.ListIndex = (listBox1.ListIndex - 2);
// delete the old occurrence of this item
listBox1.RemoveItem(listBox1.ListIndex + 2);
}
}
private void DownClick()
{
// only if the last item isn't the current one
if((listBox1.ListIndex != -1) && (listBox1.ListIndex < listBox1.ListCount - 1))
{
// add a duplicate item down in the listbox
listBox1.AddItem(listBox1.Text, listBox1.ListIndex + 2);
// make it the current item
listBox1.ListIndex = listBox1.ListIndex + 2;
// delete the old occurrence of this item
listBox1.RemoveItem(listBox1.ListIndex - 2);
}
}
Did you try searching it in google? Move Items up/dowm in listbox control for example.
public class SmartListBox : ListBox
{
//Moves the selected items up one level
public MoveUp()
{
for(int i = 0; i < Items.Count; i++)
{
if (Items[i].Selected)//identify the selected item
{
//swap with the top item(move up)
if (i > 0 && !Items[i - 1].Selected)
{
ListItem bottom = Items[i];
Items.Remove(bottom);
Items.Insert(i - 1, bottom);
Items[i - 1].Selected = true;
}
}
}
}
//Moves the selected items one level down
public MoveDown()
{
int startindex = Items.Count -1;
for (int i = startindex; i > -1; i--)
{
if (Items[i].Selected)//identify the selected item
{
//swap with the lower item(move down)
if (i < startindex && !Items[i + 1].Selected)
{
ListItem bottom = Items[i];
Items.Remove(bottom);
Items.Insert(i + 1, bottom);
Items[i + 1].Selected = true;
}
}
}
}
}
Modified @Save code to allow for moving items that are data bound to a ListBox using DataSource property.
public void MoveItem(int direction)
{
// Checking selected item
if (listBox1.SelectedItem == null || listBox1.SelectedIndex < 0)
return; // No selected item - nothing to do
// Calculate new index using move direction
int newIndex = listBox1.SelectedIndex + direction;
// Checking bounds of the range
if (newIndex < 0 || newIndex >= listBox1.Items.Count)
return; // Index out of range - nothing to do
UnifyCamera selected = listBox1.SelectedItem as UnifyCamera;
// modify the data source list
inputData.Cameras.RemoveAt(listBox1.SelectedIndex);
inputData.Cameras.Insert(newIndex, selected);
// re-bind your data source
((ListBox)listBox1).DataSource = null;
((ListBox)listBox1).DataSource = this.inputData.Cameras;
((ListBox)listBox1).DisplayMember = "Name";
// Restore selection
listBox1.SetSelected(newIndex, true);
}
Where UnifyCamera is my custom class that is stored in a list inputData.Cameras that returns a List<UnifyCamera>.
Modified Desolator code above to pass the control as a parameter...reusable
private void MoveUp()
{
MoveItem(-1,listBox1);
}
private void MoveDown()
{
MoveItem(1,listBox1);
}
public void MoveItem(int direction,ListBox listBox)
{
// Checking selected item
if (listBox.SelectedItem == null || listBox.SelectedIndex < 0)
return; // No selected item - nothing to do
// Calculate new index using move direction
int newIndex = listBox.SelectedIndex + direction;
// Checking bounds of the range
if (newIndex < 0 || newIndex >= listBox.Items.Count)
return; // Index out of range - nothing to do
object selected = listBox.SelectedItem;
// Removing removable element
listBox.Items.Remove(selected);
// Insert it in new position
listBox.Items.Insert(newIndex, selected);
// Restore selection
listBox.SetSelected(newIndex, true);
}
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