Question

我在一列中有文本框列表视图。 Listview绑定到IEnumerable集合。当我在文本框中编辑文本并单击“确定”时，绑定集合仅包含原始值我偷看了listview，看到listviewitem的对象中出现的更改出现在listview在屏幕上，但是在OK按钮处理程序中它们都消失了。

这是窗口的xaml和代码隐藏（收款人是由窗口调用者生成的linq-to-xml查询的结果）：

<Grid>  
    <ListView HorizontalAlignment="Stretch" Margin="0,38,0,0" Name="lvPayee" 
                        VerticalAlignment="Stretch" GridViewColumnHeader.Click="lvPayee_Click" Background="AliceBlue">  
        <ListView.View>  
            <GridView>  
                <GridView.Columns>  
                    <GridViewColumn Header="Listed" Width="60">  
                        <GridViewColumn.CellTemplate>  
                            <DataTemplate>  
                                <CheckBox Margin="15,0,0,0" IsChecked="{Binding Listed}"/>  
                            </DataTemplate>  
                        </GridViewColumn.CellTemplate>  
                    </GridViewColumn>  
                    <GridViewColumn Header="Payee" Width="425">  
                        <GridViewColumn.CellTemplate>  
                            <DataTemplate DataType="{x:Type TextBox}">  
                                <TextBox Width="420" Text="{Binding Name}" Background="Transparent"/>  
                            </DataTemplate>   
                        </GridViewColumn.CellTemplate>  
                    </GridViewColumn>  
                    <GridViewColumn Header="Use Count" Width="80" DisplayMemberBinding="{Binding UseCount}"/>  
                </GridView.Columns>  
            </GridView>  
        </ListView.View>  
    </ListView>  
    <CheckBox Content="Listed Only" Height="27" HorizontalAlignment="Left" Margin="57,12,0,0" Name="cbListedOnly" VerticalAlignment="Top" Width="129" IsChecked="True" Click="Listed_Clicked" />  
    <Button Content="OK" Height="27" HorizontalAlignment="Left" Margin="381,6,0,0" Name="btnOK" VerticalAlignment="Top" Width="89" Click="OK_Clicked" />  
    <Button Content="Cancel" Height="27" HorizontalAlignment="Left" Margin="493,6,0,0" Name="btnCancel" VerticalAlignment="Top" Width="80" IsCancel="True" />  
</Grid>  


public partial class PayeeManager : Window
{
    private IEnumerable<Payee> payees = null;
    private IEnumerable<Payee> payto = null;
    private bool reverse = false;
    private string lastColumn = "";

    public PayeeManager(Window owner, IEnumerable<Payee> payees)
    {
        this.Owner = owner;
        this.payees = payees;
        InitializeComponent();

        payto = from p in this.payees
                        where p.Listed == true
                        orderby p.Name
                        select p;

        lvPayee.ItemsSource = payto;
    }

    public class Payee 
    {
        public string Name { get; set; }
        public int UseCount { get; set; }
        public bool Listed { get; set; }

        public string OldName { get; set; }
        public bool OldListed { get; set; }
    }

    private void Listed_Clicked(object sender, RoutedEventArgs e)
    {
        payto = from p in this.payees
                        where cbListedOnly.IsChecked == true ? p.Listed == true : true
                        select p;

        lvPayee.ItemsSource = payto;
    }

    private void lvPayee_Click(object sender, RoutedEventArgs e)
    {
        if (!(e.OriginalSource is GridViewColumnHeader)) return;

        string header = (string)((GridViewColumnHeader)e.OriginalSource).Column.Header;
        if (lastColumn != header)
        {
            lastColumn = header;
            reverse = false;
        }
        else reverse = !reverse;

        switch (header)
        {
            case "Listed":
                    payto = from p in this.payees
                                    where cbListedOnly.IsChecked == true ? p.Listed == true : 1 == 1
                                    orderby p.Listed
                                    select p;
                break;
            case "Payee":
                    payto = from p in this.payees
                                    where cbListedOnly.IsChecked == true ? p.Listed == true : 1 == 1
                                    orderby p.Name
                                    select p;
                break;
            case "Use Count":
                    payto = from p in this.payees
                                    where cbListedOnly.IsChecked == true ? p.Listed == true : 1 == 1
                                    orderby p.UseCount
                                    select p;
                break;
            default:
                return;
        }
        if (reverse) payto = payto.Reverse();
        lvPayee.ItemsSource = payto;
    }

    private void OK_Clicked(object sender, RoutedEventArgs e)
    {
        DialogResult = true;
    }
}

Answer 1

我发现了问题。我使用listview ItemSsource Linq查询，并在访问时刷新，丢失更改。我使用ToList（）将ItemSource更改为List，现在可以正常工作。

Wpf Listview绑定对象没有更改

1 个答案: