CODEWITHSUNDEEP
c#wpflistbox
Nano HE
Nano HE

Reputation: 9307

How to remove all ListBox items?

I created two RadioButton (Weight and Height). I will do switch between the two categories. But the they share the same ListBox Controllers (listBox1 and listBox2).

Is there any good method to clear all the ListBox items simpler? I didn't find the removeAll() for ListBox. I don't like my complex multi-lines style which I posted here.

private void Weight_Click(object sender, RoutedEventArgs e)
    {
        // switch between the radioButton "Weith" and "Height"
        // Clear all the items first
        listBox1.Items.Remove("foot"); 
        listBox1.Items.Remove("inch");
        listBox1.Items.Remove("meter");
        listBox2.Items.Remove("foot");
        listBox2.Items.Remove("inch");
        listBox2.Items.Remove("meter");

        // Add source units items for listBox1
        listBox1.Items.Add("kilogram");
        listBox1.Items.Add("pound");

        // Add target units items for listBox2
        listBox2.Items.Add("kilogram");
        listBox2.Items.Add("pound");
    }

    private void Height_Click(object sender, RoutedEventArgs e)
    {
        // switch between the radioButton "Weith" and "Height"
        // Clear all the items first
        listBox1.Items.Remove("kilogram");
        listBox1.Items.Remove("pound");
        listBox2.Items.Remove("kilogram");
        listBox2.Items.Remove("pound");

        // Add source units items for listBox1
        listBox1.Items.Add("foot");
        listBox1.Items.Add("inch");
        listBox1.Items.Add("meter");

        // Add target units items for listBox2
        listBox2.Items.Add("foot");
        listBox2.Items.Add("inch");
        listBox2.Items.Add("meter");
    }

Upvotes: 36

Views: 143114

Answers (7)

DancesWithBamboo
DancesWithBamboo

Reputation: 4156

while (listBox1.Items.Count > 0){ 
    listBox1.Items.Remove(0);
}

Upvotes: 2

Paulos02
Paulos02

Reputation: 181

  • VB ListBox2.DataSource = Nothing
  • C# ListBox2.DataSource = null;

Upvotes: 0

balexandre
balexandre

Reputation: 75073

isn't the same as the Winform and Webform way?

listBox1.Items.Clear();

Upvotes: 93

Bruno
Bruno

Reputation: 11

I made on this way, and work properly to me:

if (listview1.Items.Count > 0)
        {
            for (int a = listview1.Items.Count -1; a > 0 ; a--)
            {
                listview1.Items.RemoveAt(a);
            }
                listview1.Refresh();

        }

Explaining: using "Clear()" erases only the items, do not removes then from object, using RemoveAt() to removing an item of beginning position just realocate the others [if u remove item[0], item[1] turns into [0] triggering a new internal event], so removing from the ending no affect de others position, its a Stack behavior, this way we can Stack over all items, reseting the object.

Upvotes: 0

Pulkit
Pulkit

Reputation: 31

Write the following code in the .cs file:

ListBox.Items.Clear();

Upvotes: 3

user1017477
user1017477

Reputation: 904

You should be able to use the Clear() method.

Upvotes: 1

Matt Dearing
Matt Dearing

Reputation: 9386

I think it would be better to actually bind your listBoxes to a datasource, since it looks like you are adding the same elements to each listbox. A simple example would be something like this:

    private List<String> _weight = new List<string>() { "kilogram", "pound" };
    private List<String> _height = new List<string>() { "foot", "inch", "meter" };

    public Window1()
    {            
        InitializeComponent();
    }        

    private void Weight_Click(object sender, RoutedEventArgs e)
    {
        listBox1.ItemsSource = _weight;
        listBox2.ItemsSource = _weight;
    }

    private void Height_Click(object sender, RoutedEventArgs e)
    {
        listBox1.ItemsSource = _height;
        listBox2.ItemsSource = _height;
    }

Upvotes: 9

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