blocks|key|4697560|text|正如在问题的评论中提到的，项目之间不同的.NET框架版本可能会导致这种情况。检查新项目的属性以确保未使用不同的默认版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697561|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|$]]

As mentioned in the question's comments, differing .NET Framework versions between the projects can cause this. Check your new project's properties to ensure that a different default version isn't being used.

blocks|key|191941|text|对于要一起使用的两个(或所有)项目：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|191942|右键单击项目>属性>应用程序>目标.NET框架|191943|确保两个(或所有)项目使用相同的.NET框架版本。|191944|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|$]]

For both of (or all of) the projects that you want to use together:

Right click on the project > Properties > Application > Target .NET framework

Make sure that both of (or all of) your projects are using the same .NET framework version.

blocks|key|191870|text|重新安装当前解决方案的所有项目中的所有包：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|191871|Update-Package+-Reinstall|code-block|syntax|javascript|191872|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Reinstall all packages in all projects of the current solution:

<pre><code>Update-Package -Reinstall
</code></pre>

blocks|key|4697859|text|尝试关闭和打开VS。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697860|看起来很傻，但在遵循上面的1个小时后，发现一切都很好。我重新启动了VS+2017，问题消失了。|4697861|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|$]]

Try closing and opening VS. 

Seems silly but after 1 hour of following the above and finding everything lined up OK. I restarted VS 2017 and the problems were gone.

blocks|key|4697808|text|对我来说，在.NET+Framework4.7.1控制台应用程序中引用.NET标准2.0类库时，我遇到了这个问题。是的，这些框架是不同的，但它们是兼容的(.NET标准应该与.NET核心和.NET框架都兼容)。我试着清理，重建，删除和读取项目参考，等等……但没有成功。最后，退出Visual+Studio并重新打开解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697809|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, I ran into this issue when referencing a .NET Standard 2.0 class library in a .NET Framework 4.7.1 console application. Yes, the frameworks are different, but they are compatible (.NET Standard is supposed to jive with both .NET Core and .NET Framework.) I tried cleaning, rebuilding, removing and readding the project reference, etc... with no success. Finally, quitting Visual Studio and reopening resolved the issue.

blocks|key|4697666|text|检查引用的DLL的NETFramework+&添加dll的项目。例如:+DLL+==>+supportedRuntime+version="v4.0“Project+==>+supportedRuntime+version="v3.0”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697667|您将看到警告图标。解决方法:使dll版本保持一致。|4697668|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|$]]

Check NETFramework of the referred dll &amp; the Project where you are adding the DLL.
Ex: 
DLL ==> supportedRuntime version="v4.0"
Project ==> supportedRuntime version="v3.0"

You will get warning icon.
Solution : Make dll version consistence across.

blocks|key|4697513|text|这个问题已经被问了很长时间了，但是如果有人仍然感兴趣的话--我最近遇到了类似的图标。我正在使用VS2008编译一个C#.net项目。我发现VS找不到这些引用的程序集。当我双击VS时，刷新了引用并删除了一些thoseEDIT:上的图标，它现在可以找到这些图标了。对于剩余的引用，我必须编译各自的程序集。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697514|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|$]]

It's been a long time since this question was asked but if someone is still interested - I recently ran into similar icons. I was compiling a C#.net project using VS 2008. I found VS could not locate the assemblies for those references. When I double clicked VS refreshed the references and removed the icons on some of those[EDIT: which it could NOW locate]. For remaining references, I had to compile the respective assemblies.

blocks|key|4697616|text|将我的2美分添加到@kad81答案中，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697617|转到Visual+Studio+->+BUILD+->配置管理器|4697618|在右上角的"Active+Solution+Platform“下拉列表中(我的是VS+2012)，如果是"Mixed+Platforms"，请根据您引用的第三方程序集将其更改为适当的平台。|4697619|然后，在列表中的每个项目中，确保为所有项目选择相同的平台。(如果x86不存在，则选择""，然后可以选择“x86”。)|4697620|首先重新生成库项目，然后再引用项目。希望这能有所帮助。|4697621|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Adding my 2 cents to the @kad81 answer,

Go to Visual Studio -> BUILD -> Configuration Manager

In the "Active Solution Platform" drop down in top right hand corner (mine is VS 2012), if it is "Mixed Platforms", change it to the appropriate platform based upon your reference third party assemblies.

Then in each of the project in the list, make sure you select same platform for all the project. (if x86 not exist, then select "", then you can select "x86".)

Rebuild the library projects first and then referencing projects. 
Hope this helps.

blocks|key|192018|text|在Asp.net核心中，如果您更改项目名称空间或名称，它有时会显示警报。要删除此类警报，只需卸载Project并重新加载即可。如果问题仍然存在，则表示找不到您的程序集引用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192019|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 Asp.net core sometime it shows alert if you changes the project name space or name. To remove this kind of alerts you just Unload Project and load it again. 
If issue is still there means you it can not find your Assembly reference.

blocks|key|191993|text|我有这些图标是出于不同的原因。我们所有的项目都有一个很好的解决方案(将近100个)。我对我感兴趣的项目进行了再选择，并提出了一个新的解决方案。但是，当项目引用而不是对已编译的dll的引用时，引用...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|191994|经过一些研究，我发现了this+link+on+GitHub，它解释了这是VS2015中的新行为。|offset|length|191995|在GitHub页面上，他们解释了一种将项目引用转换为二进制引用的解决方法。|191996|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/dotnet/roslyn/issues/4358^0|0|B|J|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I had these icons for a different reason. We have one big solution for all our projects (nearly 100). I made a subselection of the projects I was interested in and made a new solution. However the references where project references instead of references to the compiled dll's.... 

After some research I found <a href="https://github.com/dotnet/roslyn/issues/4358" rel="nofollow" title="Visual Studio 2015 no longer uses a binary reference to a library when its project is loaded in the same solution">this link on GitHub</a> which explains this is new behaviour in VS2015. 

On the GitHub page they explain a workaround for converting project references to binary references.

blocks|key|192352|text|在多项目解决方案中，如果其他所有事情都失败了.在startUp项目中，选中。依赖项->程序集，并查看错误引用的项目是否在那里。将其移除并重新构建。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192353|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 a multi-project solution, If every other thing failed... On the startUp project, check.
Dependencies->Assemblies and see if the erring referenced project is there. Remove it and re-build.

blocks|key|192171|text|我也面临着同样的问题，但我的情况与上面的略有不同。我试图打开在另一台计算机上创建的项目。我发现当你添加一个引用时，包文件夹的路径没有更新，所以重启VS，改变.NET版本，或者任何提到的建议都不能解决这个问题。我在notepad%2B%2B中打开了csproj文件，并更正了包文件夹的所有相对路径。然后，所有的警告都消失了。希望能有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192172|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|$]]

I also faced the same problem but my case was a bit different the ones above. I tried to open a project created in a different computer. I found that the path to package folder is not updated when you add a reference so restarting VS, changing .NET version, or any mentioned recommendation does not solve the problem. I opened the csproj file in notepad++ and corrected all the relative paths to packages folder. Then; all the warnings are gone. Hope it helps.

blocks|key|4697966|text|在VS+2017中进行清理，然后构建|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4697967|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 VS 2017 Do a Clean then Build

blocks|key|192252|text|谢谢大家的帮助。以下是我如何解决问题的细目：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192253|右键单击您的项目>属性|192254|在Application下，更改目标Framework。在我的例子中，ImageSharp使用的是.Net+4.6.1。你可以在你的packages.config中找到这个。|192255|转到您的项目引用。你会注意到SixLabors有一个黄色的三角形。您必须更新NuGet包。|192256|右键单击References+>+Manage+NuGet+Packages。|192257|更新SixLabors。|192258|您可能有轻微的代码更新(见下文)，但这解决了我的问题。|192259|Convert+ImageSharp.Image+to+ImageSharp.PixelFormats.Rgba32?|offset|length|192260|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/57789399/convert-imagesharp-image-to-imagesharp-pixelformats-rgba32^0|0|0|0|0|0|0|0|0|1N|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

Thank you all for the help. Here is a breakdown of how I fixed my problem:

Right click on your project > Properties

Under Application change the target Framework. In my case ImageSharp was using .Net 4.6.1. You can find this in your packages.config.

Go to your project references. You'll notice SixLabors has a yellow triangle. You have to update the NuGet package.

Right click on References > Manage NuGet Packages.

Update SixLabors.

You might have slight code updates (see below) but this fixed my problem.

<a href="https://stackoverflow.com/questions/57789399/convert-imagesharp-image-to-imagesharp-pixelformats-rgba32">Convert ImageSharp.Image to ImageSharp.PixelFormats.Rgba32?</a>

blocks|key|4698056|text|在Visual+Studio2019中，我的一个项目目标框架是.net核心，但它引用了另一个目标框架是.net标准的项目。我更改了所有的项目以引用.net标准，然后图标就消失了。要查看您的项目是什么，请单击它，然后单击属性并查看Target+framework。您也可以正常单击项目本身，然后查看<+PropertyGroup+>下的<+TargetFramework+>标记|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4698057|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 Visual Studio 2019, one of my projects target framework was .net core but it was referencing another project whose target framework was .net standard. I changed all of the projects to reference .net standard and the icons went away. To see what your project is right click it and click properties and look at Target framework. You can also normal click the project itself and look at the &lt; TargetFramework > tag under &lt; PropertyGroup >

blocks|key|4698104|text|我在一个针对.NET核心3.1、.NET标准2.0和.NET框架4.8的项目的解决方案中也遇到了同样的问题。问题在最后一个问题上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4698105|为我解决这个问题的诀窍是将目标框架更改为.NET+Framework4.5，然后再更改回.NET+Framework4.8。|4698106|我完全不知道为什么这样做解决了这个问题，但它确实解决了这个问题。|4698107|IDE是Visual+Studio+2019。|4698108|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I had the same issue in a solution with projects targting .NET Core 3.1, .NET Standard 2.0 and .NET Framework 4.8. The issue was on this last one.
The trick that solved the issue for me, was to change the target framework to .NET Framework 4.5, then back to .NET Framework 4.8.
I have absolutely no idea why this fixed the issue, but it did.
The IDE was Visual Studio 2019.

blocks|key|192419|text|我创建了一个新的.sln，它放在一个子文件夹中。添加.sln文件的位置缺少.nuget文件夹。将.nuget文件夹从根目录移到我的新.sln文件所在的子文件夹中，为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192420|我稍后回来，将.sln文件添加到根目录，并删除子文件夹。最初这样做也可以解决这个问题。|192421|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|$]]

I had created a new .sln which was put in a subfolder. The .nuget folder was missing from where that .sln file was added. Moving the .nuget folder from the root into the subfolder where my new .sln file was solved the issue for me.
I came back later and added the .sln file to the root and deleted the subfolder. Doing this originally would have solved the issue as well.

blocks|key|4698346|text|如果您使用的是较新样式的Sdk项目，请将OutputType添加到您引用的项目中的ProjectGroup元素中，并将其值设为Library。如果它位于您正在引用的项目中，并且它引用了一个没有设置的项目，那么它也会给您带来痛苦。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4698347|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|$]]

If you're using the newer style Sdk projects add OutputType to the ProjectGroup element with a value of Library in the project you're referencing.
It'll also give you grief if it's in the project you're referencing and it references a project without the setting.

blocks|key|4698390|text|找到您的.csprojc文件并打开它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4698391|找到你的包路径。我通过这个问题修复了我的项目。|4698392|..\packages\EntityFramework.6.1.3\lib\net45\EntityFramework.dll|code-block|syntax|javascript|4698393|这..。意味着vs将在父目录中找到此dll。|4698394|你应该确认你的包路径，你的遗嘱解决了这个问题。|4698395|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

find your .csprojc file and open it.
find your packages path. I fixed my project by this issue.
<pre><code>..\packages\EntityFramework.6.1.3\lib\net45\EntityFramework.dll
</code></pre>
this .. means vs will find this dll in parent directory.
you should confirm your package path, and your will fixed this issue.

I wish to test the core class of a plugin by directly referencing the plugin project and instantiating the plugin class. When I create a test Console App project and add a project reference to the plugin project, I get a warning icon (yellow triangle with exclamation mark) next to the reference in the References list. 

When I instead add a reference to the dll, the assembly build output of the plugin, I get no such warning. What could this warning be trying to tell me?

Why do I get a warning icon when I add a reference to an MEF plugin 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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我希望通过直接引用插件项目并实例化插件类来测试插件的核心类。当我创建一个测试控制台App项目并将项目引用添加到插件项目中时，在引用列表中的引用旁边会看到一个警告图标(带有感叹号的黄色三角形)。相反，当我添加对dll的引用时，插件的程序集生成输出没有收到这样的警告。这个警告能告诉我什么呢？

问为什么在添加对MEF插件项目的引用时会出现警告图标？
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回答 19

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问为什么在添加对MEF插件项目的引用时会出现警告图标？EN

回答 19

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问为什么在添加对MEF插件项目的引用时会出现警告图标？
EN