Question

我在WPF应用程序中有一个ListView控件和几个按钮。根据按钮单击，我想将不同类的不同结果集填充到列表视图中。所有这些不同的类都包含在一个类（ReportClass）中，如下所示。方式，我试图实现这一点是通过从代码隐藏更改listview的GridView和ItemSource。此代码几乎可以正常工作。因为列表视图结果会在按钮单击时发生更改，但仅显示类名而不是该类列表中的结果。

P.S：我不是XAML / WPF的专家。但是，如果有更简单的解决方案..欢迎使用。感谢

这是我的代码：

public class animalTypes1
{
    public string type1name { get; set; };      
}

public class animalTypes2
{
    public string type2name { get; set; };
}

public class ReportClass
{
    public List<animalTypes1> animaltype1 = new List<animalTypes1>();
    public List<animalTypes2> animaltype2 = new List<animalTypes2>();

}

    private ObservableCollection<ReportClass> _DynamicreportClass;
    public ObservableCollection<ReportClass> _DynamicReportSetClass
    {
        get
        {
            if (_DynamicreportClass == null)
            {
                _DynamicreportClass = new ObservableCollection<ReportClass>();
            }
            return _DynamicreportClass;
        }

    }

    public MainWindow()
    {
        InitializeComponent();           


        GridView g1 = new GridView();
        g1.AllowsColumnReorder = true;
        g1.ColumnHeaderToolTip = "mammals";

        GridViewColumn g1c = new GridViewColumn();
        g1c.DisplayMemberBinding = new Binding("type1name");
        g1c.Header = "AnimalReport1Header";
        g1c.Width = 120;
        g1.Columns.Add(g1c);


        GridView g1x = new GridView();
        g1x.AllowsColumnReorder = true;
        g1x.ColumnHeaderToolTip = "mammals";

        GridViewColumn g1cx = new GridViewColumn();
        g1cx.DisplayMemberBinding = new Binding("type2name");
        g1cx.Header = "AnimalReport2Header";
        g1cx.Width = 120;
        g1x.Columns.Add(g1cx);


        ReportClass allreports = new ReportClass();
        allreports.animaltype1.Add(new animalTypes1() { type1name = "Mammals" });
        allreports.animaltype2.Add(new animalTypes2() { type2name = "Reptiles" });

        this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background, new System.Action(delegate ()
        {
            _DynamicReportSetClass.Add(allreports);

        }));

    private void btn1_click(object sender, RoutedEventArgs e)
    {

        ReportGrid.ItemsSource = _DynamicreportClass[0].animaltype1;
        ReportGrid.View = g1;
    }

    private void btn_click2(object sender, RoutedEventArgs e)
    {

        ReportGrid.ItemsSource = _DynamicreportClass[0].animaltype2;
        ReportGrid.View = g1x;

    }

这是XAML：

<Grid>
    <WrapPanel Margin="0,0,0,125">
        <StackPanel Orientation="Horizontal">
            <Button Content="Checkbtn" Click="btn1_click"></Button>
        </StackPanel>
        <Button Content="Checkbtn" Click="btn_click2"/>
    </WrapPanel>

    <ListView 
        x:Name="ReportGrid" 
        Margin="0,199,0,0"  
        VerticalAlignment="Stretch" 
        HorizontalAlignment="Stretch" 
        HorizontalContentAlignment="Stretch"
        >
        <ListView.View>
            <GridView/>
        </ListView.View>         
    </ListView>
</Grid>

Answer 1

有充分的理由遵循MVVM模式将视图与行为分开。对于当前情况，最好为ListView实现触发式样式：

extern crate hwloc;

use hwloc::{Topology, ObjectType};

fn main() {
    // Create a new Topology
    let topology = Topology::new();

    // Get all objects with type "Core"
    let cores = topology.objects_with_type(&ObjectType::Core);

    // Match on the returned Result and print the length if successful.
    match cores {
       Ok(c) => println!("There are {} cores on this machine.", c.len()),
       Err(e) => panic!(format!("Could not load cores because of: {:?}", e))
    }
}

并改变MainWindow的实施

<ListView 
    Margin="0,199,0,0"  
    VerticalAlignment="Stretch" 
    HorizontalAlignment="Stretch" 
    HorizontalContentAlignment="Stretch">
    <ListView.Style>
        <Style TargetType="ListView">
            <Setter Property="ItemsSource" Value="{Binding Source1}"/>
            <Setter Property="View">
                <Setter.Value>
                    <GridView AllowsColumnReorder="True" ColumnHeaderToolTip="mammals">
                        <GridViewColumn Header="AnimalReport1Header" Width="120" DisplayMemberBinding="{Binding type1name}"/>
                    </GridView>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsSource2}" Value="True">
                    <Setter Property="ItemsSource" Value="{Binding Source2}"/>
                    <Setter Property="View">
                        <Setter.Value>
                            <GridView AllowsColumnReorder="True" ColumnHeaderToolTip="mammals">
                                <GridViewColumn Header="AnimalReport2Header" Width="120" DisplayMemberBinding="{Binding type2name}"/>
                            </GridView>
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ListView.Style>
</ListView>

Answer 2

我发现了这个错误。 listview没有使用gridview更新的原因是因为Gridview实例＆＃34; g1＆＃34;和＆＃34;＆＃34; g1x＆＃34; 。我错了，我已经实例化了我已经＆＃34; g1＆＃34;和＆＃34; g1x＆＃34;为null。并且，在构造函数方法中再次实例化，它没有更新公开声明的实例。

使用多个Gridview C＃WPF更新ListView

2 个答案: