Question

我尝试创建自定义列表框以显示某些数据，但是我无法找到在DataTemplate控件和项属性之间设置绑定的正确方法。

我有以下POCO课程：

Namespace Model
    Public Class Version

        Property Numero As String

        Property Checksum As String

    End Class
End Namespace

这个ViewModel类：

Imports System.ComponentModel
Imports System.Collections.ObjectModel

Namespace ViewModel
    Public Class VersionViewModel
        Implements INotifyPropertyChanged


        Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged


        Private _ListaVersiones As ObservableCollection(Of Model.Version)
        Public Property ListaVersiones As ObservableCollection(Of Model.Version)
            Get
                Return _ListaVersiones
            End Get
            Set(value As ObservableCollection(Of Model.Version))
                _ListaVersiones = value
                NotifyPropertyChanged("Versiones")
            End Set
        End Property

        Private Sub NotifyPropertyChanged(ByVal propertyName As String)
            RaiseEvent PropertyChanged(Me, New ComponentModel.PropertyChangedEventArgs(propertyName))
        End Sub


    End Class
End Namespace

我试图在以下XAML中使用此ViewModel：

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vm="clr-namespace:Projeto.ViewModel"
    Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
    <Window.Resources>
        <vm:VersionViewModel x:Key="ViewModel"/>
        <Style 
            BasedOn="{StaticResource {x:Type ListBox}}"
            TargetType="ListBox"
            x:Key="EstiloGridVersion">

            <Setter Property="ItemTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <Grid Background="Blue">
                            <Border Background="Red" x:Name="border" BorderBrush="Gray" CornerRadius="6" Height="30" BorderThickness="1">

                                <!-- The error is in the Binding Path -->
                                <TextBlock Text="{Binding  Path=ListaVersiones.Numero}"/>
                            </Border>
                        </Grid>

                    </DataTemplate>
                </Setter.Value>
            </Setter>

        </Style>
    </Window.Resources>

    <ListBox x:Name="GridVersion" Style="{StaticResource EstiloGridVersion}" ItemsSource="{Binding Source={StaticResource ViewModel}, Path=ListaVersiones}">

    </ListBox>
</Window>

TextBlock绑定选项给我一个错误＆＃34;无法解析符号X＆＃34;。

这样做的正确方法是什么？

更新

这是Window Loaded事件代码：

Class MainWindow

    Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs)
        Dim versiones As New VersionViewModel
        versiones.ListaVersiones = New ObjectModel.ObservableCollection(Of Model.Version)()
        versiones.ListaVersiones.Add(New Model.Version() With {.Numero = "07.0201", .Checksum = "0450a4s6540a6s5006a5s4"})
        versiones.ListaVersiones.Add(New Model.Version() With {.Numero = "07.0207", .Checksum = "243jkh234jh23j3406a5s4"})

        GridVersion.ItemsSource = versiones
    End Sub

End Class

Answer 1

由于ItemsSource设置为ObservableCollection<Model.Version>，因此每个项目都属于Model.Version类型，对于每个DataContext，这将是ListBoxItem，因此{{1}你需要引用DataTemplate

的属性

Model.Version

另外，它不应该编译，但问题是当你指定<TextBlock Text="{Binding Path=Numero}"/>

时

ItemsSource

您应该指定GridVersion.ItemsSource = versiones

versiones.ListaVersiones

另一件事是，当您为GridVersion.ItemsSource = versiones.ListaVersiones属性引发NotifyPropertyChanged时，您需要传递 ListaVersiones （确切的属性名称）而不是 Versiones 你现在这样做

ListaVersiones

由于您手动设置了NotifyPropertyChanged("ListaVersiones")，因此您不需要在XAML中进行此操作

ItemsSource

您在ItemsSource="{Binding Source={StaticResource ViewModel}, Path=ListaVersiones}" 中创建的新VersionViewModel实例与您在XAML中创建的实例

Window_Loaded

如何将DataTemplate控件绑定到ObservableCollections＆＃39;项目属性

更新

1 个答案: