Question

我根据要求动态添加了8个按钮。

堆叠面板中的所有按钮。

int Total_images = img.Count;
int Page_size = 6;
int capacity = 0;
if (Total_images % Page_size == 0){
    capacity = Total_images / Page_size;
}
else{
    capacity = (Total_images / Page_size) + 1;
}
int j = 1;
if (sp.Children.Capacity==0){
    //if (capacity <= 4){
        for (int i = 0; i < capacity; ++i){
            Button button = new Button(){
                Content = string.Format("" + j),
                Tag = i
            };
            j += 1;
            button.Width = 20;
            button.Height = 20;
            button.Click += new RoutedEventHandler(button_Click);
            sp.Children.Add(button);
        }
}

显示8个按钮，如1 2 3 4 5 6 7 8.
我旁边和之前有两个按钮。
首先，我必须显示4个按钮，如1 2 3 4，
然后显示剩余的4个按钮。
如果我点击下一个按钮，它应显示接下来的4个按钮，
如果我点击上一个，则应显示前4个按钮。

有没有办法做到这一点？

Answer 1

理想情况下，您应该使用视图模型进行集合绑定这看起来像这样，请注意，这只是指向正确方向的基本示例

class ViewModelPager : INotifyPropertyChanged
{
    public ObservableCollection<int> Items { get; } = new ObservableCollection<int>(Enumerable.Range(1, 20));
    public IEnumerable<int> ShowItems => Items.Skip(Page * 4).Take(4);
    private int page;

    public event PropertyChangedEventHandler PropertyChanged;

    public int Page
    {
        get { return page; }
        set
        {
            page = value;
            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(nameof(Page)));
            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(nameof(ShowItems)));
        }
    }

    public ICommand Next { get; set; }
    public ICommand Previous { get; set; }
}

然后在你的XAML中你将没有代码

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:ViewModelPager/>
    </Window.DataContext>
    <StackPanel >
        <ItemsControl ItemsSource="{Binding ShowItems}">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Button Content="{Binding}"/>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
        <Slider Value="{Binding Page}"/>
        <Button Command="{Binding Next}">Next</Button>
        <Button Command="{Binding Previous}">Previous</Button>
    </StackPanel>
</Window>

有关如何实现命令的信息，请参阅RelayCommand

Answer 2

清除StackPanel并添加新按钮：

NextButton_Click(sender...)
{
   sp.Children.Clear();

   for(i = 0; i < 3; i++)
   {
        Button button = new Button(){
            Content = (i+5).ToString();
        };
        button.Width = 20;
        button.Height = 20;
        button.Click += new RoutedEventHandler(button_Click);
        sp.Children.Add(button); 
   }
}

PreviousButton_Click(sender...)
{
   sp.Children.Clear();

   for(i = 0; i < 3; i++)
   {
        Button button = new Button(){
            Content = (i+1).ToString();
        };
        button.Width = 20;
        button.Height = 20;
        button.Click += new RoutedEventHandler(button_Click);
        sp.Children.Add(button); 
   }
}

如何调整wpf中添加的动态按钮？

2 个答案: