Question

我在WPF应用程序页面上有多个扩展器。我想将一个扩展器触发的动作重复到其他扩展器。即，在一个扩展器发生扩展事件时，所有其他扩展器也应扩展。同样会崩溃。任何代码片段的想法将不胜感激。

<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">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Expander Grid.Row="0" IsExpanded="True">
        <Expander.Header>
            Expander 1
        </Expander.Header>
        <Expander.Content>
            This is first Expander
        </Expander.Content>
    </Expander>

    <Expander Grid.Row="1" IsExpanded="True">
        <Expander.Header>
           Expander 2
        </Expander.Header>
        <Expander.Content>
            This is Second Expander
        </Expander.Content>
    </Expander>

</Grid>

Answer 1

这可以通过几种方法来解决。最好的方法是在viewmodel中设置一个属性，并将所有扩展器链接到该属性。

检查以下代码：

在视图模型中添加了一个属性，并更改了Inotifyproperty。
将其绑定到isexpand，如下所示。

IsExpanded="{Binding ExpandAll, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}"

完整的代码如下：

MainWindow.xaml

<Window x:Class="SOF.Window2"
        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:SOF"
        mc:Ignorable="d"
        Title="Window2" Height="450" Width="800">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
        <Expander Grid.Row="0" IsExpanded="{Binding ExpandAll, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}" >
                <Expander.Header>
                    Expander 1
                </Expander.Header>
                <Expander.Content>
                    This is first Expander
                </Expander.Content>
            </Expander>

        <Expander  Grid.Row="1" IsExpanded="{Binding ExpandAll, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}">
                <Expander.Header>
                    Expander 2
                </Expander.Header>
                <Expander.Content>
                    This is Second Expander
                </Expander.Content>
            </Expander>

        </Grid>
    </Window>

MainWindow.cs

   public partial class Window2 : Window
    {
        public Window2()
        {
            InitializeComponent();
            ExpanderViewModel evm = new ExpanderViewModel();
            this.DataContext = evm;
        }
    }
}

ViewModel.cs

 public abstract class ObservableModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged([CallerMemberName] string propname = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propname));
        }
        public ObservableModel() { }
    }

    public class ExpanderViewModel: ObservableModel
    {
        private bool mExpandAll;
        public bool ExpandAll
        {
            get { return mExpandAll; }
            set { mExpandAll = value; OnPropertyChanged(); }
        }

        public ExpanderViewModel() { }
    }

扩展一个扩展器也应扩展所有其他扩展器

1 个答案: