再生步骤:
当应用程序启动时,打开组合框以便生成项目。现在点击“点击我!” 按钮。在后面的代码中,组合框的 itemssource 发生了变化。现在尝试再次打开组合框。即使绑定集合中只有 2 个项目,组合框也会冻结至少 5 秒。这只是一个测试应用程序。在我的实际应用中,有2个以上的项目,并且滞后是难以忍受的。我已经尝试过开启和关闭虚拟化。没什么区别。
什么需要这么长时间?我该如何解决?如果没有直接修复,是否有解决方法?
XAML:
<StackPanel>
<ComboBox x:Name="cbo" DisplayMemberPath="Junk1"></ComboBox>
<Button Content="Click Me!" Click="btn_Click"></Button>
</StackPanel>
代码:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}
ObservableCollection<Junk> junk1 = new ObservableCollection<Junk>() {
new Junk() { Junk1 = "jdkf", Junk2 = "fjdfkasjd;klfj" },
new Junk() { Junk1 = "jfdk;a", Junk2 = "fjkdljf" } };
ObservableCollection<Junk> junk2 = new ObservableCollection<Junk>() {
new Junk() { Junk1 = "fjkdfhsdjk", Junk2 = "fdjkah;" },
new Junk() { Junk1="", Junk2 = "asdfj" } };
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
this.cbo.ItemsSource = junk1;
}
private void btn_Click(object sender, RoutedEventArgs e)
{
if (this.cbo.ItemsSource == junk1)
this.cbo.ItemsSource = junk2;
else
this.cbo.ItemsSource = junk1;
this.cbo.UpdateLayout();
}
}
public class Junk
{
public string Junk1 { get; set; }
public string Junk2 { get; set; }
}