如何将 listbox.items 转换为数组

Question

I'm making a search function for a ListBox , and I would like that as soon as the user types something into a TextBox , all items are removed from the ListBox except the item that matches the search text.

//files[i] are the files of the openfiledialog
List<String> ListboxItems = new List<String> {files[i]}; 

try
{
    String search = gunaTextBox1.Text;

    if (String.IsNullOrEmpty(search))
    {
        listBox1.Items.Clear();
        listBox1.Items.AddRange(ListboxItems.ToArray());
    }

    var items = (from a in ListboxItems
                 where a.StartsWith(search)
                 select a).ToArray<String>();

    listBox1.Items.Clear();
    listBox1.Items.AddRange(items);
}          
catch { }

Does anyone know how I can implement this?

Answer 1

Here is the solution

first you need to add a List String List<string> listcollection = new List<string>();

then you need to write the Textbox1_TextChanged event

List<string> listcollection = new List<string>();
    private void gunaTextBox1_TextChanged(object sender, EventArgs e)
    {           
        if(gunaTextBox1.Text == "Suche")
        {

        }
        else
        {
            try
            {
                String search = gunaTextBox1.Text;

                if (String.IsNullOrEmpty(search))
                {
                    listBox1.Items.Clear();
                    listBox1.Items.AddRange(listcollection.ToArray());
                }

                var items = (from a in listcollection
                             where a.IndexOf(search, StringComparison.OrdinalIgnoreCase) > -1
                             select a).ToArray<String>();

                listBox1.Items.Clear();
                listBox1.Items.AddRange(items);
            }
            catch
            {

            }
        }         
    }

and then just link it up

 listcollection.Clear();
                foreach(string str in listBox1.Items)
                {
                    listcollection.Add(str);
                }