我用MVVM模式制作了UWP应用(我认为是:))
我的应用程序具有用于列表框的数据模板。
View.xaml中的列表框:

<ListBox x:Name="lbMySongs" ItemsSource="{Binding Path=MySongs}" ItemTemplate="{StaticResource lbSongsTemplate}" Grid.Row="1">
        <ListBox.ItemContainerStyle>
            <Style TargetType="ListBoxItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            </Style>
        </ListBox.ItemContainerStyle>
</ListBox/>

DateTemplate资源:
       <DataTemplate x:Key="lbSongsTemplate">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="auto"/>
                <ColumnDefinition Width="auto"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="auto"/>
                <ColumnDefinition Width="auto"/>
            </Grid.ColumnDefinitions>
            <TextBlock Text="{Binding Path=Artist}" Grid.Column="0"/>
            <TextBlock Text=" - " Grid.Column="1"/>
            <TextBlock Text="{Binding Path=Title}" Grid.Column="2"/>
            //Here i bind command, but it's not binding cos ItemsSource have no command. ViewModel have this command.
            <Button Command="{Binding Path=DownloadCommand}" Content="{Binding Path=Query}"/>
            <TextBlock Text="{Binding Duration}" Grid.Column="5" HorizontalAlignment="Right"/>
        </Grid>
       </DataTemplate>

需要为此按钮设置DataContext。
我在ViewModel中的命令。例子:
class ViewModel
{
    ...
    public RelayCommand DownloadCommand { get; set; }
    public ObservableCollection<SomeClass> MySongs { get; set; }
    ...
}

我的问题:DataTemplate有ItemsSource = ViewModel.MySongs。但是“DownloadCommand”在ViewModel中。
我在DataTemplate中为绑定(bind)到DownloadCommand的按钮设置了什么?

最佳答案

尝试使用:

<Button Command="{Binding Path=DataContext.DownloadCommand, ElementName=lbMySongs}"
        CommandParameter="{Binding}"
        Content="{Binding Path=Query}"/>

并改变
public RelayCommand DownloadCommand { get; set; }


public RelayCommand<SomeClass> DownloadCommand { get; set; }
...
DownloadCommand = new RelayCommand<SomeClass>(DownloadExecute);
...
private voir DownloadExecute(SomeClass item)
{
    ...
}

关于c# - DataTemplate中的绑定(bind)命令,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/39642758/

10-14 01:48