blocks|key|2871786|text|这看起来像是Automapper包使用的.NET版本与您的项目不匹配。您能确认您的项目正在使用的.NET版本吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871787|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 looks like a mismatch between the .NET version used by the Automapper package and your project. Can you confirm the .NET version that your project is using?

blocks|key|115210|text|似乎是当前版本的automapper的一个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|115211|115212|+AutoMapper+5.0.0,2016年6月28日星期二|blockquote|115213|115214|115215|我尝试了上一个版本，它可以工作：|115216|PM>+Install-Package+AutoMapper+-Verbose
Install-Package+:+'AutoMapper'+already+has+a+dependency+defined+for+'Microsoft.CSharp'.
At+line:1+char:16
%2B+Install-Package+<<<<++AutoMapper+-Verbose
++++%2B+CategoryInfo++++++++++:+NotSpecified:+(:)+[Install-Package],+InvalidOperationException
++++%2B+FullyQualifiedErrorId+:+NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

PM>+Install-Package+AutoMapper+-Version+4.2.1
Installing+'AutoMapper+4.2.1'.
Successfully+installed+'AutoMapper+4.2.1'.|code-block|syntax|javascript|115217|所以，如果你不能更新NuGet包管理器，答案是：|115218|PM>+Install-Package+AutoMapper+-Version+4.2.1|115219|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|10|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|11|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|12|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|T|$]]

Seems to be a problem with the current version of automapper:

<blockquote>
 AutoMapper 5.0.0 Tuesday, June 28, 2016
</blockquote>

I tried with the previous version and it works:

<pre><code>PM&gt; Install-Package AutoMapper -Verbose
Install-Package : 'AutoMapper' already has a dependency defined for 'Microsoft.CSharp'.
At line:1 char:16
+ Install-Package &lt;&lt;&lt;&lt; AutoMapper -Verbose
 + CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
 + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

PM&gt; Install-Package AutoMapper -Version 4.2.1
Installing 'AutoMapper 4.2.1'.
Successfully installed 'AutoMapper 4.2.1'.
</code></pre>

So, if you can't update NuGet Package Manager, the answer is:

<pre><code>PM&gt; Install-Package AutoMapper -Version 4.2.1
</code></pre>

blocks|key|2660983|text|问题是你的NuGet包管理器太旧了。您需要NuGet+2.12，因为它支持AutoMapper+5.0.1+NuGet包正在使用的较新的.NETStandard框架。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2660984|AutoMapper具有指定.NETStandard的目标框架的组依赖项。由于您的NuGet包管理器版本太旧，它无法识别此目标框架，并将其转换为未知的目标框架，您最终会得到重复的框架，因为.NETStandard在该NuGet包中被使用了几次。这会导致以下错误：|2660985|'AutoMapper'+already+has+a+dependency+defined+for+'Microsoft.CSharp'|code-block|syntax|javascript|2660986|不幸的是，NuGet+2.12不适用于Visual+Studio2012，但适用于Visual+Studio2013。|2660987|因此，要么你需要更新到Visual+Studio2013或更高版本，要么你将不得不使用不支持.NETStandard的旧版AutoMapper+NuGet包。|2660988|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.nuget.org/release-notes/nuget-2.12^0|L|A|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

The problem is that your NuGet Package Manager is too old. You need <a href="http://docs.nuget.org/release-notes/nuget-2.12" rel="noreferrer">NuGet 2.12</a> since this supports the newer .NETStandard frameworks that the AutoMapper 5.0.1 NuGet package is using.

The AutoMapper has a group dependency which specifies a target framework of .NETStandard. Since your version of NuGet Package Manager is too old it does not recognise this target framework and converts it to an Unknown target framework and you end up with duplicate frameworks since there .NETStandard is used a few times in that NuGet package. This causes the error:

<pre><code>'AutoMapper' already has a dependency defined for 'Microsoft.CSharp'
</code></pre>

Unfortunately NuGet 2.12 is not available for Visual Studio 2012 but is available for Visual Studio 2013.

So either you need to update to Visual Studio 2013 or above, or you will have to use the older AutoMapper NuGet package which does not support .NETStandard.

blocks|key|112505|text|如果您坚持使用VS2012和旧的Nuget版本，还有一个解决方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|112506|112507|找到VS+2012的Nuget包管理器的缓存文件夹(使用Tools+-+Options+-+Nuget+Package+Manager)|unordered-list-item|offset|length|style|CODE|112508|Open+AutoMapper.5.x.x.nupkg和您最喜欢的Zip工具|112509|修改文件AutoMapper.nuspec+-I只是删除了除.NETFramework4.5|112510|Add缓存文件夹作为Nuget源之外的所有依赖项(也可以使用控制台或图形用户界面在AutoMapper.nuspec-D15Tools+>中)，但请确保首先选择新添加的缓存文件夹作为包源。<代码>H219<代码>F220|112511|112512|当然，下一个版本的Automapper可能也需要修改，以便安装它。|112513|entityMap^0|0|0|S|5|10|7|1A|L|0|5|M|0|4|H|U|G|0|15|H|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@$F|X|G|Y|H|I]|$F|Z|G|10|H|I]|$F|11|G|12|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|13|8|@$F|14|G|15|H|I]]|9|@]|A|$]]|$1|L|3|M|5|E|7|16|8|@$F|17|G|18|H|I]|$F|19|G|1A|H|I]]|9|@]|A|$]]|$1|N|3|O|5|E|7|1B|8|@$F|1C|G|1D|H|I]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|T|$]]

An other workaround if you're stuck with VS2012 and the old Nuget version:

<ul>
<li>Find the Cache folder of VS 2012's Nuget Package Manager (with <code>Tools</code> - <code>Options</code> - <code>Nuget Package Manager</code>)</li>
<li>Open <code>AutoMapper.5.x.x.nupkg</code> with your favorite Zip Tool</li>
<li>Modify the file <code>AutoMapper.nuspec</code> - I simply deleted all dependencies except <code>.NETFramework4.5</code></li>
<li>Add the cache folder as a Nuget source (also in <code>Tools</code> - <code>Options</code> - <code>Nuget Package Manager</code>)</li>
<li>Install Automapper either with the console or the GUI but make sure to choose first the newly added cache folder as package source.</li>
</ul>

Of course, the next version of Automapper probably needs to be adapted, too, in order to install it.

blocks|key|2661100|text|我在VS2013上也遇到了同样的问题。我不得不更新到NugetUpdate5，并在https://dist.nuget.org/visualstudio-2013-vsix/v2.12.0/NuGet.Tools.vsix上获得VS2013的最新VS2013发行版|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2661101|完成后，我重新启动了Visual+Studio。在那之后，我可以使用Automapper+5.0.2包|2661102|entityMap|0|LINK|mutability|MUTABLE|url|https://dist.nuget.org/visualstudio-2013-vsix/v2.12.0/NuGet.Tools.vsix^0|15|1Y|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I had the same issue on VS2013. I had to update to VS2013 Update 5 and get the latest nuget distro for VS2013 at 
<a href="https://dist.nuget.org/visualstudio-2013-vsix/v2.12.0/NuGet.Tools.vsix" rel="nofollow noreferrer">https://dist.nuget.org/visualstudio-2013-vsix/v2.12.0/NuGet.Tools.vsix</a>

Once that was done, I rebooted Visual Studio. After that I was able to use the Automapper 5.0.2 package

blocks|key|2871907|text|我最终需要更新包含在解决方案中的NuGet.exe，以便能够通过运行以下命令来构建NuGet包：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871908|nuget.exe+update+-self|offset|length|style|CODE|2871909|entityMap^0|0|0|M|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I ended up needing to update NuGet.exe that was included in the solution to be able to build NuGet packages by running:

<code>nuget.exe update -self</code>

blocks|key|112921|text|转到Visual+Studio+>工具>扩展和更新|type|unstyled|depth|inlineStyleRanges|entityRanges|data|112922|在左侧折叠菜单中查找更新，转到Visual+Studio+Gallery。|112923|你会发现Nuget的更新。|112924|更新nuget包并尝试安装或构建项目。|112925|谢谢，GT|112926|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|$]]

Go to Visual Studio > Tools > Extension and Updates

Find Updates in left accordion menu, Go to Visual Studio Gallery.

You will find a update for Nuget.

Update the nuget package and try installing or builing the project.

Thanks,
GT

blocks|key|115304|text|Automapper+6.0.2+-+nuget+2.8.8给出了这个错误。需要更新到3.4.4才能正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|115305|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|$]]

Automapper 6.0.2 - nuget 2.8.8 gives this error. Needed to update to 3.4.4 to get this working.

blocks|key|112928|text|已删除CSharp和AutoMapper。首先安装CSharp+(4.0.0.0)，然后添加自动映射程序(6.1.1.0)。这为我解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|112929|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|$]]

Removed both CSharp and AutoMapper. Installed CSharp (4.0.0.0) first and then added Automapper (6.1.1.0). This resolved the problem for me.

blocks|key|115014|text|当我用Visual+Studio2010打开一个项目时，我观察到了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|115015|在使用VS2017打开后，我能够毫无错误地安装AutoMapper。|115016|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 observed this exact problem when opening a project with Visual Studio 2010.

After opening with VS2017, I was able to install AutoMapper without any error.

I'm trying to add AutoMapper as a dependency to a project using NuGet on Visual Studio Premium 2012, but it fails.

It says: 

<blockquote>
 Operation failed 
 'AutoMapper' already has a dependency defined for
 'Microsoft.CSharp'.
</blockquote>

I'm able to add other dependencies.

I'm using the last version of the package manager for VS 2012:

<blockquote>
 NuGet Package Manager 2.8.60318.667
</blockquote>

Any ideas what should I check?

NuGet Package Manager: 'AutoMapper' already has a dependency defined for 'Microsoft.CSharp'

我试图在Visual Studio Premium 2012上使用NuGet将AutoMapper作为依赖项添加到项目中，但失败了。上面写着：操作失败“AutoMapper”已为“Microsoft.CSharp”定义了依赖项。我可以添加其他依赖项。我使用的是VS2012的最新版本的包管理器： NuGet包管理器2.8...

问NuGet包管理器：'AutoMapper‘已经为'Microsoft.CSharp’定义了一个依赖项
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