如何將 listbox.items 轉換為數組

Question

我正在為ListBox制作一個搜索功能，我希望只要用戶在TextBox鍵入內容，除了與搜索文本匹配的項目之外，所有項目都將從ListBox中刪除。

//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 { }

有誰知道我如何實現這一點？

Answer 1

這是解決方案

首先你需要添加一個List String List<string> listcollection = new List<string>();

那么你需要編寫Textbox1_TextChanged事件

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
            {

            }
        }         
    }

然后把它鏈接起來

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