虚拟化的ListView价值循环重复的模式 [英] ListView Virtualization value repeating in Recycling Mode

问题描述

我有一个支持虚拟化ListView控件一个奇怪的问题。我创建了一个非常小的试点应用重现该问题。当我输入，在列表视图东西几文本框，然后向下滚动时，键入的值在下面的文本框不变重复几页后。

I have a strange problem with virtualization enabled ListView control. I created a very small pilot app to reproduce the issue. When I type-in something for a few textboxes in the listview and then scrolling down, after a few pages the typed-in values are repeating in the untouched textboxes below.

下面是窗口的XAML：

Here is the XAML of the window:

<Window x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">

    <Grid Name="mainGrid">
        <ListView ItemsSource="{Binding Path=DemoList}" >

            <VirtualizingStackPanel.IsVirtualizing>
                True
            </VirtualizingStackPanel.IsVirtualizing>
            <VirtualizingStackPanel.VirtualizationMode>
                Recycling
            </VirtualizingStackPanel.VirtualizationMode>

            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBox  MinHeight="20" MinWidth="200" Margin="4"/>
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>

        </ListView>

    </Grid>
</Window>

而code-背后：

And the code-behind:

namespace WpfApplication3
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            demolist a = new demolist();
            mainGrid.DataContext = a;
        }
    }

    public class demolist
    {
        public demolist()
        {
            DemoList = new List<string>();

            for (int i = 0; i <= 5000; i++)
            {
                DemoList.Add("sss");
            }
        }
        public List<string> DemoList { get; set; }
    }
}

和有关该问题的一个屏幕截图：
http://kepfeltoltes.hu/120228/Capture1_www.kepfeltoltes.hu_.png

And a screen capture about the issue: http://kepfeltoltes.hu/120228/Capture1_www.kepfeltoltes.hu_.png

是否有任何选项来解决这个问题？我想这是涉及到回收模式，但我觉得这不应该是正常的行为。

Is there any option to solve this issue? I guess it is related to the recycling mode, but I think this should not be the normal behaviour.

由于提前，

伊什特万

推荐答案

这当然一个奇怪的效果，但它似乎是由于回收模式加上其实你不是TextBox.Text属性绑定到任何东西。

That's certainly an odd effect, but it's seems to be due to the recycling mode plus the fact you're not binding the TextBox.Text property to anything.

更改code这样的（对不起，名字的变更），所有应该很好：

Change your code like this (sorry for change of names) and all should be well:

public class RecyclingListViewModel
{
    public RecyclingListViewModel()
    {
        Items = new List<DataItem>();

        for (int i = 0; i <= 5000; i++)
        {
            Items.Add(new DataItem{Id = i, Name = i.ToString(CultureInfo.InvariantCulture)});
        }
    }

    public List<DataItem> Items { get; set; }
}

public class DataItem
{
    public int Id { get; set; }
    public string Name { get; set; }
}

<ListView ItemsSource="{Binding Path=Items}" >
<TextBox  MinHeight="20" MinWidth="200" Margin="4" Text="{Binding Name}"/>

这篇关于虚拟化的ListView价值循环重复的模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！