c# - 选中的列表框数据源是否

Question

我已经在类范围内声明了一个CheckedListBoxTo a ，但是当我在某些方法中更新时，并没有改变，但是当我再次回忆以下代码时它会改变：DataSourceDataSourceCheckedListBox

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

DataSource触发更新的是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();

}