我有一個ListView綁定到一個CollectionViewSource。我跟着這篇文章(被許多人引用)進行多重過濾:http://www.zagstudio.com/blog/456#.UG8r6E1lWLEWPF多個過濾器CollectionViewSource,第一個過濾器添加工作正常,第二個過濾器添加不
我有兩個複選框設置爲測試,除了添加一個過濾器什麼也不做。每當我點擊任何一個,過濾器被添加到CollectionViewSource,它的工作原理。然後,當我點擊相反的複選框,而不是其他過濾器被添加到CollectionViewSource和這兩個過濾器工作,我的列表視圖變空白(當它不應該基於數據,這發生在任何一個檢查我的複選框的順序)
下面是相關代碼:(背景:與過濾 「訂單」 本應用程序處理的運輸軟件)
加載訂單:
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();
}
設置CollectionViewSource:
cvs = (CollectionViewSource)(this.Resources["cvs"]);
複選框功能:
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);
}
最後,過濾器(硬編碼使用filterString測試 「如何通過過濾器」):
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;
}
}
就像我說的,第一過濾器始終工作。第二個總是使屏幕變爲空白。有任何想法嗎?
因此,您確定您的記錄既是TX又是Standard?在調試中處理程序被稱爲? – Paparazzi