异常:错误 HRESULT E_FAIL 与 Microsoft LightSwitch Visual Studio 2012 RC [英] Exception: Error HRESULT E_FAIL with Microsoft LightSwitch Visual Studio 2012 RC

问题描述

我最近安装了 Visual Studio 2012 RC 以及 VS 2012 SDK 和 LightSwitch Extensibility Toolkit.

I installed Visual Studio 2012 RC recently along with VS 2012 SDK and LightSwitch Extensibility Toolkit.

这是我的 Client.Design -> TControl.XAML 文件中的 XAML 代码

this is the XAML code in my Client.Design -> TControl.XAML file

<UserControl x:Class="CustomControls.Presentation.Controls.TControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:framework="clr-namespace:Microsoft.LightSwitch.Presentation.Framework;assembly=Microsoft.LightSwitch.Client">   
    <Grid Width="Auto">
        <Grid.RowDefinitions>
            <RowDefinition Height="100"></RowDefinition>
            <RowDefinition Height="40"></RowDefinition>
        </Grid.RowDefinitions>
        <framework:ContentItemPresenter ContentItem="{Binding ChildItems[0]}" Grid.Row="0" Margin="3" />
        <framework:ContentItemPresenter ContentItem="{Binding ChildItems[1]}" Grid.Row="0" Margin="3" />
    </Grid>
</UserControl>

我在设计器上看不到此 XAML 的输出.相反，我在设计器区域看到此错误消息:

I cannot see the output of this XAML on the designer. Instead I see this error Message up on the designer area :

Exception: Error HRESULT E_FAIL has been returned from a call to a COM component.
Stacktrace: 
    at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
    at MS.Internal.XcpImports.Collection_InsertValue[T](PresentationFrameworkCollection`1 collection, UInt32 index, CValue value)
    at MS.Internal.XcpImports.Collection_InsertDependencyObject[T](PresentationFrameworkCollection`1 collection, UInt32 index, DependencyObject value)
    at System.Windows.PresentationFrameworkCollection`1.InsertDependencyObject(Int32 index, DependencyObject value)
    at System.Windows.Controls.UIElementCollection.InsertInternal(Int32 index, UIElement value)

我强烈怀疑这与此处涉及的命名空间和 Silverlight 版本有关.我的项目设置为使用 Silverlight 版本 5.

I strongly suspect this is has something to do with namespaces involved here and the Silverlight version. My project is set to use Silverlight version 5.

快速谷歌搜索和Stackoverflowing"确实揭示了有关此错误的一些一般信息，但没有太大帮助.

A quick googling and 'Stackoverflowing" did reveal some general info about this error but nothing of much help.

任何帮助将不胜感激.

推荐答案

为了在 VS2013 Ultimate 中解决这个问题，我不得不关注帖子 http://rathodkrunal.blogspot.com/2011/11/visual-studio-2010-error-hresult-efail.html

To fix this in VS2013 ultimate I had to follow the post http://rathodkrunal.blogspot.com/2011/11/visual-studio-2010-error-hresult-efail.html

其中谈到简单地清除 Visual Studio 的 ItemTemplateCache 并使用/setup 标志运行 vs 一次.

Wherein it talks about simply cleaning out Visual Studio's ItemTemplateCache and running vs with the /setup flag one time.

如果链接断开或以其他方式不可用，这里是旧版 VS 的缓存:

In case the link breaks or is otherwise unavailable here's where the cache used to be for older VS:

您可以在Program Files\Microsoft VisualStudio 10.0\Common7\IDE\ProjectTemplatesCache"，然后运行devenv/setup" 再次构建缓存，看看是否有帮助.

You can delete the project cache at "Program Files\Microsoft Visual Studio 10.0\Common7\IDE\ProjectTemplatesCache", then run "devenv /setup" to build the cache again to see if it helps.

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