blocks|key|4355669|text|因为VS2012的NuGet包管理器(版本2.8.60318.667)不支持.NETStandard+(用于最新的Newtonsoft+Json+Parser+Lib。https://github.com/NuGet/Home/issues/3131|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4355670|我通过安装旧版本的Newtonsoft+Json来解决这个问题：|4355671|PM>+Install-Package+Newtonsoft.Json+-Version+9.0.1|code-block|syntax|javascript|4355672|更多详细信息请访问：https://github.com/NuGet/Home/issues/5162。|4355673|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/NuGet/Home/issues/3131|1|https://github.com/NuGet/Home/issues/5162^0|2C|15|0|0|0|0|A|15|1|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]]|$1|K|3|L|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

because NuGet Package Manager (Version 2.8.60318.667) for VS 2012 does not support .NETStandard (Used for Latest Newtonsoft Json Parser Lib.
<a href="https://github.com/NuGet/Home/issues/3131" rel="noreferrer">https://github.com/NuGet/Home/issues/3131</a>

I resolve this issue by installing older version of Newtonsoft Json:

<pre><code>PM&gt; Install-Package Newtonsoft.Json -Version 9.0.1
</code></pre>

More details on:
<a href="https://github.com/NuGet/Home/issues/5162" rel="noreferrer">https://github.com/NuGet/Home/issues/5162</a>
.

blocks|key|4355737|text|我在使用VS2015和创建一个依赖于Newtonsoft.Json+version=10.0.3的NuGet包时也遇到了同样的问题。我使用了Vin.X在他的回答中建议的方法作为变通方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4355738|将Newtonsoft.Json+version=9.0.1安装到项目中后，在.nuspec文件中添加以下描述。|4355739|<dependencies>
++++++<dependency+id="Newtonsoft.Json"+version="10.0.3"+/>
</dependencies>|code-block|syntax|javascript|4355740|使用您的包的应用程序会将Newtonsoft.Json+version=10.0.3与您的包一起作为依赖项安装到项目中。|4355741|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I had the same issue using VS2015 and creating a NuGet package with dependency on Newtonsoft.Json version=10.0.3. I used the approach suggested by Vin.X in his answer as the work around. 

After installing Newtonsoft.Json version=9.0.1 into your project, add following description in your .nuspec file. 

<pre><code>&lt;dependencies&gt;
 &lt;dependency id="Newtonsoft.Json" version="10.0.3" /&gt;
&lt;/dependencies&gt;
</code></pre>

Application that consumes your package will install Newtonsoft.Json version=10.0.3 along with your package as a dependency into your project.

blocks|key|4356163|text|尝试安装Newtonsoft+DLL，它会将Newtonsoft.json+MsgPack安装到您的项目中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4356164|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|$]]

Try to install Newtonsoft MsgPack it will install Newtonsoft.json DLL to your project.

blocks|key|4355835|text|尝试从解决方案包目录中删除包的现有版本，然后尝试以下命令。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4355836|++++PM>+Install-Package+Newtonsoft.Json+-Version+9.0.1|code-block|syntax|javascript|4355837|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|$]]

Try removing existing version of package from solution package directory and then 
try the following command. It worked for me.

<pre><code> PM&gt; Install-Package Newtonsoft.Json -Version 9.0.1
</code></pre>

blocks|key|4356268|text|我遇到了同样的问题。我认为你需要为VS2013更新NuGet+(*Prob+VS2012也是)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4356269|这里|4356270|https://marketplace.visualstudio.com/items?itemName=NuGetTeam.NuGetPackageManagerforVisualStudio2013|offset|length|4356271|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|2S|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

I ran into the same issue. I think you need to update NuGet for VS2013 (*Prob VS2012 also)
here
<a href="https://marketplace.visualstudio.com/items?itemName=NuGetTeam.NuGetPackageManagerforVisualStudio2013" rel="nofollow noreferrer">https://marketplace.visualstudio.com/items?itemName=NuGetTeam.NuGetPackageManagerforVisualStudio2013</a>

I'm installing NewtonSoft.Json for parsing Json in .NET application. When I'm using Visual Studio(VS) 2012, it can not be installed via NuGet. 
This is the error I have got:

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

I tried to copy the DLL over and just use it, seems like some dependencies screwed up in this version (10.0.2).

After few hours research, finally I've found out it is the problem of the compatibility of VS2012 and Newtonsoft Json 10.0.2.

'Newtonsoft.Json' already has a dependency defined for 'Microsoft.CSharp'

Visual Studio

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我正在安装用于在.NET应用程序中解析Json的NewtonSoft.Json。当我使用Visual Studio(VS) 2012时，它不能通过NuGet安装。这是我得到的错误：'Newtonsoft.Json' already has a dependency defined for 'Microsoft.CSha...

问“Newtonsoft.Json”已为“Microsoft.CSharp”定义了依赖项
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