如何以编程方式为控件创建事件触发器

Question

我想以编程方式为ContentControl创建一个事件触发器。我希望获得与使用此xaml代码相同的结果。包括 - Command，CommandParameter，EventName

它在我的xaml代码中的样子：

<ContentControl>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="PreviewMouseLeftButtonDown">
            <i:InvokeCommandAction Command="{Binding ButtonClickCommand}" CommandParameter="btnAdd"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ContentControl>

Answer 1

这里是代码中的等价物：

void SetTrigger(ContentControl contentControl)
{
    // create the command action and bind the command to it
    var invokeCommandAction = new InvokeCommandAction { CommandParameter = "btnAdd" };
    var binding = new Binding { Path = new PropertyPath("ButtonClickCommand") };
    BindingOperations.SetBinding(invokeCommandAction, InvokeCommandAction.CommandProperty, binding);

    // create the event trigger and add the command action to it
    var eventTrigger = new System.Windows.Interactivity.EventTrigger { EventName = "PreviewMouseLeftButtonDown" };
    eventTrigger.Actions.Add(invokeCommandAction);

    // attach the trigger to the control
    var triggers = Interaction.GetTriggers(contentControl);
    triggers.Add(eventTrigger);
}