将命令绑定到视图的 Loaded 事件

Question

我试图让一个方法在视图完成加载后运行。我试图将命令绑定到视图中的Loaded 事件，但它无法运行。抛出的内部异常是

'在'System.Windows.Data.Binding'上提供值引发了异常。' 行号'14'和行位置'14'

<UserControl x:Class="Components.Map.MapView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:map="clr-namespace:Components.Map"
             xmlns:controls="clr-namespace:Windows.Controls;assembly=Windows.Controls"
             xmlns:ValidationRules="clr-namespace:Windows.Controls.ValidationRules;assembly=Windows.Controls"
             xmlns:directGraphicsControl="clr-namespace:Windows.DirectGraphicsControl;assembly=Windows.DirectGraphicsControl"
             xmlns:colorBar="clr-namespace:Components.Common.ColorBar;assembly=Components.Common"
             xmlns:RefinedRibbonControls="clr-namespace:Components.Common.Controls.RefinedRibbonControls;assembly=Components.Common"
             xmlns:UserControls="clr-namespace:Components.Common.UserControls;assembly=Components.Common"
             xmlns:map1="clr-namespace:Models.Map;assembly=Models.Map"
             xmlns:utilities="clr-namespace:Windows.Utilities;assembly=Windows.Utilities"
             xmlns:system="clr-namespace:System;assembly=mscorlib"
             Loaded="{Binding Path=MapControlViewModel.MapLoadedCommand}">

如何绑定到视图的 Loaded 事件，以便在视图完成加载后运行某些内容？

Answer 1

如果要将命令绑定到Loaded 事件，则应使用“System.Windows.Interactivity”程序集。

<UserControl x:Class="Components.Map.MapView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:map="clr-namespace:Components.Map"
             xmlns:controls="clr-namespace:Windows.Controls;assembly=Windows.Controls"
             xmlns:ValidationRules="clr-namespace:Windows.Controls.ValidationRules;assembly=Windows.Controls"
             xmlns:directGraphicsControl="clr-namespace:Windows.DirectGraphicsControl;assembly=Windows.DirectGraphicsControl"
             xmlns:colorBar="clr-namespace:Components.Common.ColorBar;assembly=Components.Common"
             xmlns:RefinedRibbonControls="clr-namespace:Components.Common.Controls.RefinedRibbonControls;assembly=Components.Common"
             xmlns:UserControls="clr-namespace:Components.Common.UserControls;assembly=Components.Common"
             xmlns:map1="clr-namespace:Models.Map;assembly=Models.Map"
             xmlns:utilities="clr-namespace:Windows.Utilities;assembly=Windows.Utilities"
             xmlns:system="clr-namespace:System;assembly=mscorlib"
             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity">

             <i:Interaction.Triggers>
                <i:EventTrigger EventName="Loaded">
                    <i:InvokeCommandAction Command="{Binding LoadedCommand}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>

</UserControl>

System.Windows.Interactivity.dll 位于 Microsoft Expression Blend 软件开发工具包 (SDK) (download link) 中，也可作为 NuGet package 使用。