如何解决如何将绑定值从列表视图传递给函数? C#UWP
我正在处理C#UWP分配,并且有一个列表视图,显示来自数据库的信息。我想显示一个订单列表,每行都有一个orderID和一个删除订单的按钮(它将从数据库中删除它)。我虽然可以使用x:Name =“ orderid”并在函数中提取该值,但在C#代码中无法识别它。
.xaml.cs文件包括:
Order o = new Order();
OrderList.ItemsSource = o.GetProducts(user);
.xaml(出于示例目的,删除了其他列):
<RelativePanel Grid.Row="4" Grid.RowSpan="3" Grid.Column="0" Grid.ColumnSpan="7" HorizontalAlignment="Center">
<ListView Name="OrderList"
SelectionMode="Single"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.IsVerticalRailEnabled="True"
ScrollViewer.VerticalScrollMode="Enabled"
ScrollViewer.HorizontalScrollMode="Enabled"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.IsHorizontalRailEnabled="True"
Margin="20">
<ListView.HeaderTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<TextBlock Text="ID" Margin="8,0" Width="50" Foreground="DarkRed" />
<TextBlock Text="Date" Width="200" Foreground="DarkRed" />
<TextBlock Text="Delete" Width="50"/>
</StackPanel>
</DataTemplate>
</ListView.HeaderTemplate>
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:Order">
<StackPanel Orientation="Horizontal">
<TextBlock x:Name="orderid"
Text="{x:Bind OrderID}"
Width="50" />
<TextBlock Name="orderdate"
Text="{x:Bind OrderDate}"
Width="200" />
<Button Content="X" Click="Button_Click"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</RelativePanel>
C#(订单类-OrderID等都是属性):
public ObservableCollection<Order> GetProducts(User user)
{
const string GetOrdersQuery = "select * from orders";
var orders = new ObservableCollection<Order>();
try
{
using (SqlConnection conn = new SqlConnection(user.ConnectionString))
{
conn.Open();
if (conn.State == System.Data.ConnectionState.Open)
{
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = GetOrdersQuery;
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
var order = new Order();
order.OrderID = (int)reader["orderID"];
order.OrderDate = (DateTime)reader["orderDate"];
order.MethodOfDelivery = (string)reader["methodOfDelivery"];
order.DeliveryAddress = (reader["deliveryAddress"] as string);
order.MethodOfPayment = (string)reader["methodOfPayment"];
order.CardUsed = (reader["cardNumber"] as string);
order.Subtotal = (decimal)reader["subtotal"];
order.Discount = (decimal)reader["discountPercentage"];
order.Tax = (decimal)reader["tax"];
order.OrderTotal = (decimal)reader["orderTotal"];
order.CustID = (reader["custID"] as int?) ?? 0;
orders.Add(order);
}
}
}
}
}
return orders;
}
catch (Exception eSql)
{
Debug.WriteLine("Exception: " + eSql.Message);
}
return null;
}
然后我想在xaml.cs文件中创建一个函数,该函数将获取该行的orderID,并根据ID进行查询以删除该订单,但是执行orderid.Text出于某种原因在这里无效
任何建议/帮助将不胜感激! 如果我的代码到处都是,那是因为我对此很陌生!
解决方法
一种可能的解决方案是将“ OrderId”绑定到Button元素中的“ Tag”属性。
<Button Content="X" Click="Button_Click" Tag="{Binding Id}"/>
绑定后,在Click的事件处理程序中,调用一种方法将其从数据库和ObservableCollection中删除,例如:
private void Button_Click(object sender,Windows.UI.Xaml.RoutedEventArgs e)
{
var button = sender as Button;
_viewModel.DeleteOrder((int)button.Tag);
}
我的DeleteOrder方法很简单:
private ObservableCollection<Order> _orders;
public ObservableCollection<Order> Orders
{
get { return _orders; }
set { _orders = value; OnChange(); }
}
public void DeleteOrder(int id)
{
var order = Orders.FirstOrDefault(o => o.Id == id);
if (order != null)
{
Orders.Remove(order);
}
}
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