blocks|key|3128374|text|将评论转发为答案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3128375|我能够毫无问题地完成这些步骤，而且看起来您也能够做到。也许还有其他一些无意中进行的修改/设置？|3128376|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

[Reposting comment as answer]

I was able to complete the steps with no issues, and it appears you were able to as well. Perhaps there was some other inadvertent modification/setting that was made?

blocks|key|3611787|text|转到"Build+>+Configuration+Manager..."，为您的所有项目创建一个新的x86平台。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3611788|它不一定是活动的，你可以把它保留为，任何CPU。|3611789|希望它能像我的一样工作。|3611790|entityMap^0|2|Y|1E|3|0|H|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

Go to "Build > Configuration Manager..." and Make a new platform for x86 for all your projects. 
It doesn't have to be the active one, you can leave that as Any CPU. 
 
Hope it works as for mine...

blocks|key|5250704|text|在我的例子中，我从Debug切换到Release，然后又切换回来，错误就消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5250705|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case I switched from Debug to Release, and then back, and the error was gone.

blocks|key|5341238|text|我最近也遇到了同样的错误，并且在输出窗口中发现了以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5341239|10>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.WinFX.targets(268,9):+error+MC6000:+Project+file+must+include+the+.NET+Framework+assembly+'WindowsBase,+PresentationCore,+PresentationFramework'+in+the+reference+list.|offset|length|style|CODE|5341240|我的解决方案是将缺少的引用添加到我的项目中。|5341241|entityMap^0|0|0|6A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I've recently had the same error and found the following in the output window:

<code>10&gt;C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.WinFX.targets(268,9): error MC6000: Project file must include the .NET Framework assembly 'WindowsBase, PresentationCore, PresentationFramework' in the reference list.</code>

The solution for me was to add the missing references to my project.

blocks|key|3128515|text|对我来说，将应用程序属性中的“目标框架”设置为.NET+4.0是有帮助的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3128516|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me it helped to set the "Target framework" in application-properties to .NET 4.0

blocks|key|5250549|text|对于许多XAML资源错误，这似乎有点“包罗万象”。到目前为止，我发现了两个原因：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5250550|在适当的上下文之外声明资源的|5250551|-例如，直接在UserControl标记中，而不是在包含“不受支持”类的正确命名空间的标记中。未定义sys命名空间的基本ResourceDictionary中的示例：|ordered-list-item|5250552|5250553|不支持I+|5250554|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

This appears to be a bit of a "catch-all" for a number of XAML resource errors. I've found two causes so far:

<ol>
<li>Declaring a Resource outside of the appropriate context- e.g. directly in a UserControl tags, not UserControl.Resources.</li>
<li>Forgetting to include the correct namespace for the "unsupported" class. Example in a basic ResourceDictionary, with no sys namespace defined:

<pre><code>&lt;ResourceDictionary&gt; 
 &lt;sys:string&gt;I'm not supported&lt;/sys:string&gt;
&lt;/ResourceDictionary&gt;
</code></pre></li>
</ol>

blocks|key|5341412|text|我能够解决我类似的问题..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5341413|UserControl+is+not+supported+in+a+Windows+Presentation+Foundation+(WPF)+project|offset|length|style|CODE|5341414|。。通过删除PresentationFramework引用并通过nuget重新添加它。|5341415|entityMap^0|0|0|27|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I was able to solve my similar issue of..
<code>UserControl is not supported in a Windows Presentation Foundation (WPF) project</code>
.. by removing the PresentationFramework reference and re-adding it via nuget.

blocks|key|5250761|text|这是xaml把自己搞糊涂了。我在一个项目上有错误，而在另一个项目上没有错误。查看网格错误之前的xaml顶部，并查看是否有任何对其他控件的引用。尝试进行会导致错误的修改，然后重新生成其中一个控件。然后把它放回原来的方式，以获得一个成功的构建，看看这是否会使网格错误消失。(对我来说就是这样)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5250762|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

This is xaml getting itself confused. I have the error on one project and not on another. Have a look at the top of the xaml before the grid error and see if there are any references to other controls. Try making a modification that will cause and error and rebuilding one of those controls. Then put it back the way it was to get a succesful build and see if this makes the grid error go away. (it did for me)

blocks|key|3128672|text|与Felix+D.s+answer非常相似，我发现从.csproj文件中删除了一个引用。显然，将3替换为您需要的框架，或者使用项目属性来设置版本(我认为这添加了这个引用)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3128673|当其他一些问题出现时，Evil+Dog+Pie是我的第一步。输出日志中总是有一堆信息|3128674|<Reference+Include="PresentationFramework">
++<RequiredTargetFramework>3.0</RequiredTargetFramework>
</Reference>|code-block|syntax|javascript|3128675|entityMap|0|LINK|mutability|MUTABLE|url|/questions/13095131/grid-is-not-supported-in-a-windows-presentation-foundation-wpf-project#answer-28745328|1^0|1|G|0|0|B|C|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|R]]]]

Much Like <a href="/questions/13095131/grid-is-not-supported-in-a-windows-presentation-foundation-wpf-project#answer-28745328">Felix D.s answer</a>, I found from the .csproj file a reference was removed.
Obviously replace the 3 with your needed framework, or use the project properties to set the version ( i think that adds this reference )
<a href="/questions/13095131/grid-is-not-supported-in-a-windows-presentation-foundation-wpf-project#answer-28745328">Evil Dog Pie</a> was step 1 for me, as some other issues came up. There is always a heap of information in the output log
<pre><code>&lt;Reference Include=&quot;PresentationFramework&quot;&gt;
 &lt;RequiredTargetFramework&gt;3.0&lt;/RequiredTargetFramework&gt;
&lt;/Reference&gt;
</code></pre>

blocks|key|3612097|text|此问题是由于您在项目中选择的.NET版本较低造成的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3612098|要解决此问题，请从向上菜单中选择项目，然后选择项目属性，然后从目标框架部分选择更高版本的.NET框架！|3612099|我希望你的问题得到解决。您诚挚的|3612100|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

This problem is due to the low version of .NET that you have chosen in your project.
To solve the problem, select the Project from the up menu and then select your Project Properties and from the part of Target Framework select higher version of .NET Framework!
I hope your problem is solved.
Yours sincerely

I am learning how to create a <code>Class Library (Windows Store apps)</code> and used a <code>UserControl</code> template to add a user control to it. 

Then I added a <code>Grid</code> tag to accompanying XAML. However, the tag is underlined with blue squiggles and when I hover over the tag there is 

<pre><code>Grid is not supported in a Windows Presentation Foundation (WPF) project
</code></pre>

tooltip shows up.

The library seems to build without errors. I've added the library to an application and use the control in its code. The application is also builds just fine. However, when I run the application I get <code>XamlParseException</code> exception.

I am using Visual Studio 2012 RTM. Both the library and the application reference only two standard assemblies (<code>.NET for Windows Store apps</code> and <code>Windows</code>).

What I might done wrong and how should I fix the library?

Grid is not supported in a Windows Presentation Foundation (WPF) project

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在学习如何创建Class Library (Windows Store apps)，并使用UserControl模板向其中添加用户控件。然后，我向附带的XAML添加了一个Grid标记。但是，标记下划线是蓝色的，当我将鼠标悬停在标记上时，会看到Grid is not supported in a Windows Presentation Foundation (WPF) project将显示工具

问Windows Presentation Foundation (WPF)项目中不支持网格
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