事件 'foo' 不是 RoutedEvent

Question

我尝试在现有项目的用户控件中创建路由事件，但收到错误消息 The event 'foo' is not a RoutedEvent.

为了确保我没有发疯，我用只是有问题的代码 (a Minimal, Complete, and Verifiable example") 创建了一个示例项目。

只有我在示例项目中没有收到任何错误消息。但这是完全相同的代码！

有人知道发生了什么事吗？

即使出现错误消息，项目也会编译并且 RoutedEvent 会正常工作！

我尝试清理项目、重建、重新启动 VS 和我的 PC，但无论我做什么，此错误消息仍然存在。

我相信这只是一个 IDE 问题。

我正在使用 Microsoft Visual Studio Professional 2015 版本 14.0.25431.01 更新 3

UserControl1.xaml.cs

namespace Okuma_FFP
{
    using System.Windows;
    using System.Windows.Controls;

    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
            RaiseEvent(new RoutedEventArgs(fooEvent, this));
        }

        public static readonly RoutedEvent fooEvent = EventManager.RegisterRoutedEvent(
            "foo", RoutingStrategy.Direct, typeof(RoutedEventHandler), typeof(UserControl1));

        // Provide CLR accessors for the event 
        public event RoutedEventHandler foo
        {
            add { AddHandler(fooEvent, value); }
            remove { RemoveHandler(fooEvent, value); }
        }
    }
}

UserControl1.xaml

<UserControl x:Class="Okuma_FFP.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Okuma_FFP"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Triggers>
        <EventTrigger RoutedEvent="local:UserControl1.foo">
            <BeginStoryboard>
                <Storyboard>
                    <ColorAnimation  
                        To="Blue"
                        Duration="0:0:5" 
                        Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </UserControl.Triggers>
    <Grid>  </Grid>
</UserControl>

Answer 1

这是一个 IDE 错误。
可能重复：Visual Studio displaying errors even if projects build

我得到了 this answer 的提示，并确保退出 VS in-between 清理解决方案并构建。

Delete all obj, bin, release, and debug folders

Delete Project_Folder\.vs\Project_Name\v14\.suo

Open the solution in Visual Studio

Clean Solution

Exit Visual Studio

Open the solution again

Build, build, build...

Confirm it's fixed and go get coffee

事件 'foo' 不是 RoutedEvent

The event 'foo' is not a RoutedEvent

wpf

xaml

routed-events

visual-studio-2015

有人知道发生了什么事吗？

UserControl1.xaml.cs

UserControl1.xaml