Combox large amounts of data control is bound Caton problems and solutions

Generally, we are binding in WPF Combox following such an approach.

XAML：

                        <ComboBox 
                                  IsEditable="False"
                                  ItemsSource="{Binding List, Mode=OneWay, IsAsync=True}"
                                  SelectedIndex="{Binding SelectedSheetIndex, Mode=TwoWay}">
                            <ComboBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Margin="2.5" Text="{Binding Name, Mode=OneTime}" />
                                    </StackPanel>
                                </DataTemplate>
                            </ComboBox.ItemTemplate>
                        </ComboBox>

Backstage:

        private List<string> list;
        public List<string> List
        {
            get { return list; }
            set { SetProperty(ref list, value); }
        }

Problem: will Caton, click on the drop-down list can not eject large amounts of data binding.

Solution is toItemsPanelTemplate的值设置为VirtualizingStackPanel。它可以让UI显示1万个左右的项目。

                        <ComboBox 
                                  IsEditable="False"
                                  ItemsSource="{Binding SheetList, Mode=OneWay, IsAsync=True}"
                                  SelectedIndex="{Binding SelectedSheetIndex, Mode=TwoWay}">
                            <ComboBox.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <VirtualizingStackPanel/>
                                </ItemsPanelTemplate>
                            </ComboBox.ItemsPanel>
                            <ComboBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Margin="2.5" Text="{Binding Name, Mode=OneTime}" />
                                    </StackPanel>
                                </DataTemplate>
                            </ComboBox.ItemTemplate>
                        </ComboBox>