|ZYCWPF| 在i:DataTrigger中，如何觖发Click事件，谢谢 有示例代码

Question

    <StackPanel>
         <TextBox Text="" x:Name="input"/>
         <TextBox Text="" x:Name="input2"/>
         <Button Content="Click" ToolTip="123">
             <i:Interaction.Triggers>
                 <i:EventTrigger EventName="Click">                    
                     <i:InvokeCommandAction Command="{Binding OnAdd}" CommandParameter="1">
                     </i:InvokeCommandAction>
                 </i:EventTrigger>
                 <ei:DataTrigger Binding="{Binding Text, ElementName=input}" Comparison="Equal" Value="123" >
                     <!-- 在这里能否触发他的Click事件呢？ -->
                 </ei:DataTrigger>
             </i:Interaction.Triggers>
         </Button>
     </StackPanel>也就是当input的Text为123的时候，触发Button的Click事件谢谢

Answer 1

最简单的方法是用CallMethodAction调用后台方法触发Click事件，后台程序像这样写： public void RaiseClick()
{
// 触发btn1的Click事件
btn1.RaiseEvent(new RoutedEventArgs(ButtonBase.ClickEvent));
}前台调用：    <StackPanel>
        <TextBox Text="" x:Name="input"/>
        <TextBox Text="" x:Name="input2"/>
        <Button Content="Click" ToolTip="123" Name="btn1"><!-- 起个名字btn1 -->
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
    <i:InvokeCommandAction Command="{Binding OnAdd}" CommandParameter="1" />
                </i:EventTrigger>
                <ei:DataTrigger Binding="{Binding Text, ElementName=input}" Comparison="Equal" Value="123" >
                    <ei:CallMethodAction TargetObject="{Binding}" MethodName="RaiseClick" />
                </ei:DataTrigger>
            </i:Interaction.Triggers>
        </Button>
    </StackPanel>

Answer 2

做成通用的action的方法：using System.Windows;
using System.Windows.Interactivity;namespace WpfApp1
{
public class RaiseEventAction : TargetedTriggerAction<UIElement>
{
public static readonly DependencyProperty EventProperty = DependencyProperty.RegisterAttached("Event", typeof(RoutedEvent), typeof(RaiseEventAction), new FrameworkPropertyMetadata(null)); public RoutedEvent Event
{
get { return (RoutedEvent) GetValue(EventProperty); }
set { SetValue(EventProperty, value); }
} protected override void Invoke(object parameter)
{
if (Target != null && Event != null)
Target.RaiseEvent(new RoutedEventArgs(Event));
}
}
}前台可以这样调用：<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:local="clr-namespace:WpfApp1"
        Title="MainWindow" Height="350" Width="525"
        Name="MyWindow"
    >
    <StackPanel>
        <TextBox Text="" x:Name="input"/>
        <TextBox Text="" x:Name="input2"/>
        <Button Content="Click" ToolTip="123" Name="btn1">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
                    <i:InvokeCommandAction Command="{Binding OnAdd}" CommandParameter="1" /><!-- 改成你的点击事件处理方法 -->
                </i:EventTrigger>
                <ei:DataTrigger Binding="{Binding Text, ElementName=input}" Comparison="Equal" Value="123" >
                    <local:RaiseEventAction TargetObject="{Binding ElementName=btn1}" Event="{x:Static Button.ClickEvent}" />
                </ei:DataTrigger>
            </i:Interaction.Triggers>
        </Button>
    </StackPanel>
</Window>