选中的列表框数据源是否

Question

我已将CheckedListBox限制为DataSource已在类范围内声明，但当我在某种方法中更新DataSource时，CheckedListBox不会更改，但当我再次回忆下面的代码时，它会发生变化：

private void UpdateDataSource(string textToSearch )
{

    dsContacts = dbSms.fillDataSet("Select * From Contacts Where ContactName Like'%" + textToSearch + "%'", "Contacts");

    chListBox.DataSource = dsContacts.Tables["Contacts"];
    chListBox.DisplayMember = "ContactName";
    chListBox.ValueMember = "ContactNumber";

}

Answer 1

这是触发更新的DataSource setter。当您将其设置为新值时，它将刷新检查列表框。

Answer 2

使用刷新方法。

private void UpdateDataSource(string textToSearch )
{

    dsContacts = dbSms.fillDataSet("Select * From Contacts Where ContactName Like'%" + textToSearch + "%'", "Contacts");

    chListBox.DataSource = dsContacts.Tables["Contacts"];
    chListBox.DisplayMember = "ContactName";
    chListBox.ValueMember = "ContactNumber";
    chListBox.Refresh();

}