Question

我将数据插入列表并将其绑定到数据网格。

当我尝试重新插入数据时，先前的数据被清除。

我希望之前的数据不清晰，新数据添加到列表中

 int count = 0;
    private void button_insert_Click(object sender, RoutedEventArgs e)
    {
        Table_infodetail_print tip = new Table_infodetail_print();
        List<Table_infodetail_print> ltip = new List<Table_infodetail_print>();
        tip.nation_code = nation_code;
        tip.services_discription = comboBox_services.SelectedValue.ToString();
        tip.additional_price = additional_price;
        tip.lot_patient = lot_patient;
        tip.price = price;
        tip.tariff = tariff;
        ltip.Insert(count, tip);
        var select_details = from t in ltip
                             select t;
        dataGrid_insert_services.ItemsSource = ltip;
        count++;
    }

请告诉我

Answer 1

每次按下按钮，你都会创建一个新的ltip实例。尝试像计数变量一样声明ltip globaly。

int count = 0;
List<Table_infodetail_print> ltip = new List<Table_infodetail_print>();

private void button_insert_Click(object sender, RoutedEventArgs e)
{
    Table_infodetail_print tip = new Table_infodetail_print();        
    tip.nation_code = nation_code;
    tip.services_discription = comboBox_services.SelectedValue.ToString();
    tip.additional_price = additional_price;
    tip.lot_patient = lot_patient;
    tip.price = price;
    tip.tariff = tariff;
    ltip.Insert(count, tip);
    var select_details = from t in ltip
                         select t;
    dataGrid_insert_services.ItemsSource = ltip;
    count++;
}

并且不需要count变量，因为它包含在列表中。 ltip.Count

不清楚列表<t> </t>中的先前数据

1 个答案: