如何以编程方式创建用于控制的事件触发器 [英] How to create an event trigger for control programmatically

问题描述

我想以编程方式为我的 ContentControl 创建一个事件触发器.我想获得与使用此 xaml 代码相同的结果.包括 - 命令、命令参数、事件名称

它在我的 xaml 代码中的外观:

I want to create an event trigger for my ContentControl programmatically. I want to achieve the same result as i would use this xaml code. Including - Command, CommandParameter, EventName

How it looks in my xaml code:

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

推荐答案

以下是等效代码:

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);
}

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