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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"); } 
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If we want to clear the items in the Listbox widget, we can use the delete(0, END) method. Besides deleting all the items in the Listbox, we can delete a single item as well by selecting an item from the Listbox, i.e., by using currselection() method to select an item and delete it using the delete() function.
All information about the removed item is deleted. You can use this method to remove a specific item from the list by specifying the index of the item to remove from the list. To specify the item to remove instead of the index to the item, use the Remove method. To remove all items from the list, use the Clear method.
For clearing the listbox you are right in using listbox. Item. Clear() .
BindingSource bindingSource = (BindingSource)listBox1. DataSource; IList SourceList = (IList)bindingSource. List; SourceList. Clear();
isn't the same as the Winform and Webform way?
listBox1.Items.Clear(); 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; } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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