Question

我有4个带有HeaderName的ListPickers（计算机配件类别）。

处理器。
主板。
RAM。

硬盘。

Categories.XAML.CS

public Categories()
{
    InitializeComponent();
    this.DataContext = new manufactuers();
}

private void processorListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    processorListPicker.GetBindingExpression(ListPicker.SelectedItemProperty).UpdateSource();
}

private void motherboardListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    motherboardListPicker.GetBindingExpression(ListPicker.SelectedItemProperty).UpdateSource();
}

private void harddriveListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    harddriveListPicker.GetBindingExpression(ListPicker.SelectedItemProperty).UpdateSource();
}

private void ramListPicker_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    ramListPicker.GetBindingExpression(ListPicker.SelectedItemProperty).UpdateSource();
}

Categories.XAML

        <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <toolkit:ListPicker x:Name="processorListPicker" Header="Processor"
            ItemsSource="{Binding List1, Mode=TwoWay}"
            SelectedItem="{Binding SelectedItem1, Mode=TwoWay}" 
            SelectionChanged="processorListPicker_SelectionChanged" Width="360" Margin="54,106,42,0" VerticalAlignment="Top" />
        <toolkit:ListPicker x:Name="motherboardListPicker" Header="Motherboard"
            ItemsSource="{Binding List2, Mode=TwoWay}"
            SelectedItem="{Binding SelectedItem2, Mode=TwoWay}"
            SelectionChanged="motherboardListPicker_SelectionChanged" Width="360" Margin="54,191,42,0" VerticalAlignment="Top" />
        <toolkit:ListPicker x:Name="harddriveListPicker" Header="HardDrive"
            ItemsSource="{Binding List3, Mode=TwoWay}"
            SelectedItem="{Binding SelectedItem3, Mode=TwoWay}"
            SelectionChanged="harddriveListPicker_SelectionChanged" Width="360" Margin="54,282,42,240" Height="85" />
        <toolkit:ListPicker x:Name="ramListPicker" Header="RAM"
            ItemsSource="{Binding List4, Mode=TwoWay}"
            SelectedItem="{Binding SelectedItem4, Mode=TwoWay}"
            SelectionChanged="ramListPicker_SelectionChanged" Width="360" Margin="54,0,42,155" VerticalAlignment="Bottom" Height="85" />
    </Grid>

。制造商.s - ViewModel

public class manufacturers
{
    public manufacturers()
    {
        // MUST Initialize the selected items
        SelectedItem1 = "INTEL";
        SelectedItem2 = "ASUS";
        SelectedItem3 = "WESTERN DIGITAL";
        SelectedItem4 = "CORSAIR";
    }

    private IEnumerable<string> manufacturersList
    {
        get
        {
            return new[]
               {
                   "INTEL",
                   "AMD",
                   "WESTERN DIGITAL",
                   "CORSAIR",
                   "SEAGATE",
                   "ASUS",
                   "SAMSUNG",
                   "TOSHIBA",
                   "KINGSTON",
               };
        }
    }

    public IEnumerable<string> List1
    {
        get
        {
            return manufacturersList;
        }
    }

    public IEnumerable<string> List2
    {
        get
        {
            return manufacturersList;
        }
    }

    public IEnumerable<string> List3
    {
        get
        {
            return manufacturersList;
        }
    }

    public IEnumerable<string> List4
    {
        get
        {
            return manufacturersList;
        }
    }

    public string SelectedItem1 { get; set; }
    public string SelectedItem2 { get; set; }
    public string SelectedItem3 { get; set; }
    public string SelectedItem4 { get; set; }
}

现在，当用户点击任何这些LISTPICKERS时，例如用户选择PROCESSORS-LISTPICKER，制造处理器的所有供应商都应该显示在LISTPICKER项目中。

注意：假设我们有制造商列表，可以从viewmodel或在线解析XML或HTML。

Answer 1

这对我来说是新的，因为我不是一个经验丰富的程序员，所以我不能给你代码，所以我必须研究如何构建它，但我会这样做的方式是绑定到视图模型的控件，并使用INotifyPropertyChanged将该视图模型发送回UI。将按钮（我假设按钮，因为您说单击它们）绑定到视图模型中的命令，视图模型使用该事件将正确的列表返回到ListBox。

我现在正在尝试自学MVVM，否则我甚至无法提出建议。

Answer 2

除非我不理解这个问题：

XAML：

 <Controls:ListPicker Header="Processor:"
                             ItemsSource="{Binding ProcessorMfgs}"
                             Margin="0,499,0,-499" />

ViewModel中的

：

  private List<string> _processorMfgs;
        public List<string> ProcessorMfgs
        {
            get { return _processorMfgs; }
            set
            {
                _processorMfgs = value;
                NotifyOfPropertyChange(() => ProcessorMfgs);
            }
        }

    ProcessorMfgs = new List<string>
                                {
                                    "Intel", "AMD"
                                };

关于过滤Listpicker的指导

2 个答案: