[英]How to catch a custom event with Interactivity.EventTrigger
I'm trying to catch my custom event (TextUpdateEvent) with Interactivity.EventTrigger in the way shown below. 我正在尝试通过Interactivity.EventTrigger捕获我的自定义事件(TextUpdateEvent),如下所示。 But this code gives rise to System.ArgumentException with the message that "The event "MyTextBox" was not found in the type "tool:MyTextBox.TextUpdateEvent"."
但是,此代码会引发System.ArgumentException,并显示以下消息:“在类型“ tool:MyTextBox.TextUpdateEvent”中未找到事件“ MyTextBox”。 Could you tell me what is wrong with this?
你能告诉我这是怎么回事吗?
<UserControl x:Class="mynamespace.MyControl"
xmlns:local="clr-namespace:mynamespace"
xmlns:info="clr-namespace:mynamespace.info"
xmlns:tool="clr-namespace:mynamespace.tool"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Grid>
<Border>
<ItemsControl ItemsSource="{Binding MyItems}" Name="itemsControl">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="info:MyInfo">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding MyComment}"/>
<tool:MyTextBox Text="{Binding MyName}" x:Name="myTextBox">
<i:Interaction.Triggers>
<i:EventTrigger EventName="tool:MyTextBox.TextUpdateEvent"
SourceObject="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type tool:MyTextBox}}}"
SourceName="myTextBox">
<ei:CallMethodAction MethodName="UpdateMyInfo" TargetObject="{Binding Path=DataContext, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}, Mode=TwoWay}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</tool:MyTextBox>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Border>
</Grid>
namespace mynamespace.tool
{
//used to judge whether or not the update suceeded
public delegate bool MyTextBoxUpdateHandler(object sender);
public partial class MyTextBox : TextBox
{
public MyTextBoxUpdateHandler TextUpdateEvent { get; set; }
}
}
Or, do I need to create a custom trigger to catch my custom event? 还是我需要创建一个自定义触发器来捕获我的自定义事件?
public class TextUpdateEventTrigger : EventTriggerBase<MyTextBox>
{
// I don't know what I should do here,
// since the event I'd like to catch is not a RoutedEvent.
}
You should change the TextUpdateEvent
to an event instead of a property. 您应该将
TextUpdateEvent
更改为事件而不是属性。
public event MyTextBoxUpdateHandler TextUpdateEvent;
Since you're calling a method in code-behind you also do not need to attach Interaction
triggers: 由于您是在代码后方调用方法,因此您也不需要附加
Interaction
触发器:
<tool:MyTextBox
x:Name="myTextBox"
Text="{Binding MyName}"
TextUpdateEvent="UpdateMyInfo" />
The DataContext
Property does not need to be bound on the UserControl
itself, because it's already a partial class of the UserControl
, you can remove that too. DataContext
属性不需要绑定到UserControl
本身,因为它已经是UserControl
的局部类,您也可以删除它。
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