我有一个ListView绑定到一个CollectionViewSource。我跟着这篇文章(被许多人引用)进行多重过滤:http://www.zagstudio.com/blog/456#.UG8r6E1lWLEWPF多个过滤器CollectionViewSource,第一个过滤器添加工作正常,第二个过滤器添加不
我有两个复选框设置为测试,除了添加一个过滤器什么也不做。每当我点击任何一个,过滤器被添加到CollectionViewSource,它的工作原理。然后,当我点击相反的复选框,而不是其他过滤器被添加到CollectionViewSource和这两个过滤器工作,我的列表视图变空白(当它不应该基于数据,这发生在任何一个检查我的复选框的顺序)
下面是相关代码:(背景:与过滤 “订单” 本应用程序处理的运输软件)
加载订单:
public class Order
{
public int index { get; set; }
public string host { get; set; }
public Int64 orderNumber { get; set; }
public string batchStatus { get; set; }
public string sku { get; set; }
public int numItems { get; set; }
public string orderSource { get; set; }
public string sourceOrderNumber { get; set; }
public DateTime orderDate { get; set; }
public DateTime orderTime { get; set; }
public int customerID { get; set; }
public string shipMethod { get; set; }
public string billingState { get; set; }
public bool statusChanged { get; set; }
public int numSkus { get; set; }
public string marketName { get; set; }
public float weight { get; set; }
}
public class Orders : ObservableCollection<Order>
{
public Orders()
{
SqlDataReader reader1 = cmd.ExecuteReader();
while (reader1.Read())
{
Order order = new Order();
order.host = (string)safeGetString(reader1, 0);
order.orderNumber = (Int64)reader1["OrderNumber"];
order.batchStatus = (string)safeGetString(reader1, 2);
order.orderSource = (string)safeGetString(reader1, 3);
order.sourceOrderNumber = safeGetString(reader1, 4);
order.orderDate = (DateTime)reader1["OrderDate"];
order.customerID = (int)reader1["CustomerID"];
order.shipMethod = (string)safeGetString(reader1, 7);
order.billingState = (string)safeGetString(reader1, 8);
order.numItems = (int)reader1["NumItems"];
order.numSkus = (int)reader1["NumSKUs"];
order.marketName = (string)safeGetString(reader1, 11);
order.weight = (float)(double)reader1["ShippedWeight"];
this.Add(order);
}
reader1.Close();
}
设置CollectionViewSource:
cvs = (CollectionViewSource)(this.Resources["cvs"]);
复选框功能:
public void checkBox2_Checked(object sender, RoutedEventArgs e)
{
filterString = "TX";
cvs.Filter += new FilterEventHandler(billingStateFilter);
}
public void checkBox1_Checked(object sender, RoutedEventArgs e)
{
filterString = "Standard";
cvs.Filter += new FilterEventHandler(shippingMethodFilter);
}
最后,过滤器(硬编码使用filterString测试 “如何通过过滤器”):
private void shippingMethodFilter(object sender, FilterEventArgs e)
{
Order order = e.Item as Order;
if ((order.shipMethod != filterString))
{
e.Accepted = false;
}
}
public void billingStateFilter(object sender, FilterEventArgs e)
{
Order order = e.Item as Order;
if ((order.billingState != filterString))
{
e.Accepted = false;
}
}
就像我说的,第一过滤器始终工作。第二个总是使屏幕变为空白。有任何想法吗?
因此,您确定您的记录既是TX又是Standard?在调试中处理程序被称为? – Paparazzi