WPF mvvm向导(WPF mvvm wizard)

WPF mvvm向导(WPF mvvm wizard)

我正在实现WPF MVVM向导，我想知道在加载新的向导页面（UserControl）时执行DoOperation的正确方法。

DoOperation在MyWizard.ViewModal类上实现，而UserControl Load在MyWizard.View命名空间发生。

如何在UserControl加载的事件与DoOperation api之间建立连接？

我尝试了以下方法：

<xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" <i:Interaction.Triggers> <i:EventTrigger EventName="Loaded"> <i:InvokeCommandAction Command="{Binding Path=RunOperation}"/ </i:EventTrigger> </i:Interaction.Triggers>

RunOperation调用DoOperation 。

它不起作用， RunOperation没有被调用。

这是正确的方法还是有更好的方法在MyWizard.ViewModal类上执行操作？

I am implementing WPF MVVM Wizard and I am wondering about the right approach of performing a DoOperation when a new Wizard’s Page (UserControl) is loaded.

The DoOperation is implemented on the MyWizard.ViewModal class while the UserControl Load is happening at the MyWizard.View namespaces.

How can I connect between the UserControl loaded event to the DoOperation api?

I tried the following:

<xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" <i:Interaction.Triggers> <i:EventTrigger EventName="Loaded"> <i:InvokeCommandAction Command="{Binding Path=RunOperation}"/ </i:EventTrigger> </i:Interaction.Triggers>

RunOperation calls DoOperation.

it doesn’t work, RunOperation is not being called.

This is the right approach or there is a better way to perform an operation at the MyWizard.ViewModal class?

最满意答案

你的方法应该有效。 您是否检查过输出控制台是否存在绑定错误？ RunOperation是一个命令吗？ 当引发Loaded事件时，是否已设置UserControl的DataContext？ 你在UC中实现了这样的触发器吗？

<UserControl x:Class="..."
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                  
             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity">

    <i:Interaction.Triggers>

        <i:EventTrigger EventName="Loaded">
            <i:InvokeCommandAction Command="{Binding Path=RunOperation}"/>
        </i:EventTrigger>

    </i:Interaction.Triggers>

    <Grid>
        ...
    </Grid>

</UserControl>
Your approach should work. Have you checked your output console for binding errors? Is RunOperation a command? Is the DataContext of the UserControl already set, when the Loaded event is raised? Have you implemented the triggers like this in your UC?
 
<UserControl x:Class="..."
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                  
             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity">

    <i:Interaction.Triggers>

        <i:EventTrigger EventName="Loaded">
            <i:InvokeCommandAction Command="{Binding Path=RunOperation}"/>
        </i:EventTrigger>

    </i:Interaction.Triggers>

    <Grid>
        ...
    </Grid>

</UserControl>