CODEWITHSUNDEEP
c#wpfcombobox
CareTaker22
CareTaker22

Reputation: 1300

Clearing All ComboBoxes method

I am trying to create a method that will clear all of the ComboBoxes on my window. This is what I have tried so far:

private void ClearAllComboboxes(ComboBox cmb)
{
    cmb.SelectedIndex = -1;
}

And then I call the method like below, but I can only insert one ComboBox to clear at a time.

private void btnClearAll_Click(object sender, RoutedEventArgs e)
{
    ClearAllComboboxes(cmbBarlocks);
}

So what I am trying to do is clear all of the comboboxes with as little coding as possible. Can someone please tell me how and what would be the best possible way to do this? Thank you :)

Upvotes: 1

Views: 304

Answers (4)

DT sawant
DT sawant

Reputation: 1221

I assume that you are using MVVM and you have SelectedItem property for every combobox in your viewmodel. In viewmodel, you can just set SelectedItem=null for each combobox. It will clear your combobox selection.

If you are not using MVVM, then you can use following code in code behind:

private void ClearAllComboboxes()
    {
        List<ComboBox> comboBoxes = new List<ComboBox>();

        GetLogicalChildCollection<ComboBox>(container, comboBoxes);

        comboBoxes.ForEach(combobox => combobox.SelectedIndex = -1);
    }

    private static void GetLogicalChildCollection<T>(DependencyObject parent,List<T> logicalCollection) where T : DependencyObject
    {

        var children = LogicalTreeHelper.GetChildren(parent);
        foreach (object child in children)
        {
            if (child is DependencyObject)
            {
                DependencyObject depChild = child as DependencyObject;
                if (child is T)
                {
                    logicalCollection.Add(child as T);
                }
                GetLogicalChildCollection(depChild, logicalCollection);
            }
        }
    }

Upvotes: 1

Dimitris Batsougiannis
Dimitris Batsougiannis

Reputation: 759

In your handler try this, it worked when I had a similar issue with ListBox

void ClearCombos(params ComboxBox[] boxes)
{
foreach(var box in boxes)
box.ItemsSource = null;
}

and call it ClearCombos(x,y,z); where x,y,z are the boxes you want to clear

Upvotes: 0

Ghanshyam Baravaliya
Ghanshyam Baravaliya

Reputation: 147

protected void btnAll_Click(object sender, EventArgs e)
        {

            ClearInputs(Page.Controls);
        }

        //For Clear All Control Values
        void ClearInputs(ControlCollection ctrls)
        {
         foreach (Control ctrl in ctrls)
            {
               if (ctrl is ComboBox )
                    ((ComboBox )ctrl).ClearSelection();

                ClearInputs(ctrl.Controls);
            }
        }

Upvotes: 0

sujith karivelil
sujith karivelil

Reputation: 29006

Let me assume All your comboboxes are inside a container(let it be stackPanel), the you can set selected index to -1 for all of them using the following snippet:

  foreach (Control ctrl in stkContainer.Children)
            {
                if (ctrl.GetType() == typeof(ComboBox))
                {
                    ComboBox cbo = ctrl as ComboBox;
                    ClearAllComboboxes(cbo);
                }
            }

If you want to clear the combobox means you have to re-define your method signature as:

private void ClearAllComboboxes(ComboBox cmb)
{
   cmb.Items.Clear();
}

Upvotes: 0

Related Questions