wpf下拉多选自定义控件添加change事件

Posted 2023-03-16

参考技术A 当用户选择下拉选项中选项时，需要对特定选项执行一些功能，就需要用到SelectionChanged事件，用来监视用户选择。在这个事件中可以使用SelectedValueToString语句，将选项转换为字符串，获取用户选项。需要同时实现可以手动编辑选项，即将IsEditable设置为true，这时程序就会报错。

WPF 分页控件添加路由事件

昨天的代码经过大佬的指点，又优化了一下，

看看优化了哪些：

在Pagination类中添加事件定义：

public static readonly RoutedEvent IndexChangedEvent = EventManager.RegisterRoutedEvent("IndexChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(Pagination));
        //CLR事件包装
        public event RoutedEventHandler IndexChanged
        {
            add { this.AddHandler(IndexChangedEvent, value); }
            remove { this.RemoveHandler(IndexChangedEvent, value); }
        }

在CurrentPage的改变事件中触发事件：

public int CurrentPage
        {
            get { return (int)GetValue(CurrentPageProperty); }
            set { SetValue(CurrentPageProperty, value); }
        }
        public static readonly DependencyProperty CurrentPageProperty =
            DependencyProperty.Register("CurrentPage", typeof(int), typeof(Pagination), new PropertyMetadata(1, (d, e) =>
            {
                if (!(d is Pagination pagination)) return;
                if (pagination.PageCount > 5)
                {
                    pagination.UpdateControl();
                }
                else
                {
                    pagination.UpdateControlSimple();
                }
                RoutedEventArgs args = new RoutedEventArgs()
                {
                    RoutedEvent = IndexChangedEvent,
                    Source = pagination,
                };
                pagination.RaiseEvent(args);
            }));

然后，MainWindow中绑定事件：

<Window x:Class="WPFDemos.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:WPFDemos"
        mc:Ignorable="d"
        x:Name="widnow"
        WindowStartupLocation="CenterScreen"
        UseLayoutRounding="True"
        Background="#F5F5F5"
        FontSize="16"
        Title="分页" Height="500" Width="1000">
    <Grid>
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
            <local:Pagination x:Name="pag0" PageCount="3" Height="35" HorizontalAlignment="Center"/>
            <TextBlock Margin="10" HorizontalAlignment="Center">
                <Run Text="当前页："/>
                <Run Text="{Binding CurrentPage,ElementName=pag0}"/>
            </TextBlock>
            
            <local:Pagination x:Name="pag" PageCount="5" Height="35" HorizontalAlignment="Center"/>
            <TextBlock Margin="10" HorizontalAlignment="Center">
                <Run Text="当前页："/>
                <Run Text="{Binding CurrentPage,ElementName=pag}"/>
            </TextBlock>
            
            <local:Pagination x:Name="pag1" PageCount="35" Height="35" IndexChanged="pag1_IndexChanged"/>
            <TextBlock Margin="10" HorizontalAlignment="Center">
                <Run Text="当前页："/>
                <Run Text="{Binding CurrentPage,ElementName=pag1}"/>
            </TextBlock>
        </StackPanel>
    </Grid>
</Window>

这样就能直接在index改变的时候，响应改变事件喽。

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