C# XamlParseException，Set connectionId引发异常

当我在Xaml下运行时，出现错误：

System.Windows.Markup.XamlParseException:“”Set connectionId引发了 例外。“行号“18”和行位置“14”

内部异常1:InvalidCastException:无法转换 'System.Windows.Style'object to'System.Windows.Controls.TreeView' 类型

请不要将此问题标记为重复，因为我在中检查了所有类似的问题，但找不到有效的答案

<Window x:Class="WpfApp1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:WpfApp1"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">
<Window.Resources>

    <DataTemplate x:Key="xxx">
        <Grid>
            <local:ButtonEx ToolTipService.ToolTipClosing="ButtonEx_ToolTipClosing"/>
        </Grid>
    </DataTemplate>

    <Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem" >
        <EventSetter Event="MouseDoubleClick" Handler="TreeViewItem_MouseDoubleClick"/>
    </Style>

</Window.Resources>
<Grid>
    <TreeView x:Name="treeViewBookmarks" ItemContainerStyle="{StaticResource TreeViewItemStyle}"/>
</Grid>

如果删除：

ToolTipService.ToolTipClosing=“ButtonEx\u ToolTipClosing”

，或删除：

EventSetter Event=“MouseDoubleClick”Handler=“TreeViewItem\u MouseDoubleClick”

，或删除

x:Name=“treeViewBookmarks”

，则无错误

---

如果我使用

按钮

而不是

按钮nex

-没有错误。

这是个好问题

看起来这是WPF

PresentationBuildTasks

组件中的一个bug

正如您所知，构建WPF项目会导致大量编译器生成的代码被注入到UI类中

例如，您的

main窗口

类将另外获得如下内容：

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
public void InitializeComponent()
{
    if (!_contentLoaded)
    {
        _contentLoaded = true;
        Uri resourceLocater = new Uri("/WpfApp1;component/mainwindow.xaml", UriKind.Relative);
        Application.LoadComponent(this, resourceLocater);
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IComponentConnector.Connect(int connectionId, object target)
{
    if (connectionId == 2)
    {
        treeViewBookmarks = (TreeView)target;
    }
    else
    {
        _contentLoaded = true;
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IStyleConnector.Connect(int connectionId, object target)
{
    if (connectionId == 1)
    {
        EventSetter eventSetter = new EventSetter();
        eventSetter.Event = Control.MouseDoubleClickEvent;
        eventSetter.Handler = new MouseButtonEventHandler(TreeViewItem_MouseDoubleClick);
        ((Style)target).Setters.Add(eventSetter);
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IComponentConnector.Connect(int connectionId, object target)
{
    if (connectionId == 3)
    {
        treeViewBookmarks = (TreeView)target;
    }
    else
    {
        _contentLoaded = true;
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IStyleConnector.Connect(int connectionId, object target)
{
    switch (connectionId)
    {
    case 1:
        ((Button)target).AddHandler(ToolTipService.ToolTipClosingEvent, new ToolTipEventHandler(ButtonEx_ToolTipClosing));
        break;
    case 2:
    {
        EventSetter eventSetter = new EventSetter();
        eventSetter.Event = Control.MouseDoubleClickEvent;
        eventSetter.Handler = new MouseButtonEventHandler(TreeViewItem_MouseDoubleClick);
        ((Style)target).Setters.Add(eventSetter);
        break;
    }
    }
}

那些

Connect

方法生成不正确

如果将

数据模板

中的

按钮

替换为

按钮

，这些

连接

方法将如下所示：

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
public void InitializeComponent()
{
    if (!_contentLoaded)
    {
        _contentLoaded = true;
        Uri resourceLocater = new Uri("/WpfApp1;component/mainwindow.xaml", UriKind.Relative);
        Application.LoadComponent(this, resourceLocater);
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IComponentConnector.Connect(int connectionId, object target)
{
    if (connectionId == 2)
    {
        treeViewBookmarks = (TreeView)target;
    }
    else
    {
        _contentLoaded = true;
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IStyleConnector.Connect(int connectionId, object target)
{
    if (connectionId == 1)
    {
        EventSetter eventSetter = new EventSetter();
        eventSetter.Event = Control.MouseDoubleClickEvent;
        eventSetter.Handler = new MouseButtonEventHandler(TreeViewItem_MouseDoubleClick);
        ((Style)target).Setters.Add(eventSetter);
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IComponentConnector.Connect(int connectionId, object target)
{
    if (connectionId == 3)
    {
        treeViewBookmarks = (TreeView)target;
    }
    else
    {
        _contentLoaded = true;
    }
}

[DebuggerNonUserCode]
[GeneratedCode("PresentationBuildTasks", "4.0.0.0")]
[EditorBrowsable(EditorBrowsableState.Never)]
void IStyleConnector.Connect(int connectionId, object target)
{
    switch (connectionId)
    {
    case 1:
        ((Button)target).AddHandler(ToolTipService.ToolTipClosingEvent, new ToolTipEventHandler(ButtonEx_ToolTipClosing));
        break;
    case 2:
    {
        EventSetter eventSetter = new EventSetter();
        eventSetter.Event = Control.MouseDoubleClickEvent;
        eventSetter.Handler = new MouseButtonEventHandler(TreeViewItem_MouseDoubleClick);
        ((Style)target).Setters.Add(eventSetter);
        break;
    }
    }
}

请参见，

连接ID

不同

---

您应该向Microsoft报告此问题。您案例中的

PresentationBuildTasks

出现问题。

我可以在哪里报告此问题？