c# - 单声道 GTK# : Trying to remove text in ComboBox and then prepend new text to the ComboBox but some of the old text remains

Question

我试图先删除 ComboBox 中的所有内容。然后在其前面添加文本，但保留了一些旧文本。有没有办法重置或清除 ComboBox？或者我怎样才能最好地实现这一目标？

public void GetBadgeName ()  
{  
     try  
    {  

    int i = 0;
    while (i < 200)
        {
            cmb_SelectBadge.RemoveText(i);
            ++i;
        }

   string connectionString = "URI=file:SIGN.sqlite";
   IDbConnection dbcon;
   dbcon = (IDbConnection) new SqliteConnection(connectionString);
   dbcon.Open();
   IDbCommand dbcmd = dbcon.CreateCommand();

   string sql =
      "SELECT BadgeName " +
      "FROM Badge";
   dbcmd.CommandText = sql;
   IDataReader reader = dbcmd.ExecuteReader();

   while(reader.Read()) {
    string BadgeName = reader.GetString (0);

    cmb_SelectBadge.PrependText(BadgeName);

            }

   reader.Close();
   reader = null;
   dbcmd.Dispose();
   dbcmd = null;
   dbcon.Close();
   dbcon = null;
    }         
    catch (Exception ex)
        {
            MessageBox.Show(ex.Message);    

        }
    }

Answer 1

我想通了。只需创建一个新的空 ListStore(我称之为 ClearList)，然后使 combobox.Model 等于 ClearList。然后像往常一样在组合框前面添加或附加文本。

 ListStore ClearList = new ListStore(typeof(string),typeof(string));
 cmb_SelectBadge.Model = ClearList;

 // This example retrieves each BadgeName from the Badge table (see question)
 while(reader.Read()) {
     string BadgeName = reader.GetString (0);
     cmb_SelectBadge.PrependText(BadgeName);
        }