https://img-blog.csdn.net/2018101221265224?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

联机库

https://img-blog.csdn.net/2018101221274419?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

搜索nuGet

https://img-blog.csdn.net/20181012212934124?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

下载安装

https://img-blog.csdn.net/20181012214609923?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

工具菜单中多了一个nuGet选项

https://img-blog.csdn.net/20181012214649315?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

扩展管理器中也可以看到

https://img-blog.csdn.net/20181012214743958?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

https://img-blog.csdn.net/20181012214759124?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

打开一个项目

https://img-blog.csdn.net/20181012215652893?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

什么都没有

https://img-blog.csdn.net/20181012220254729?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

添加一个

打开“工具”——“选项”

https://img-blog.csdn.net/20181012220327119?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

点击绿色的加号，源为自己下载的包所在的文件夹路径，名称自己起

https://img-blog.csdn.net/20181012222008430?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

点击确定

https://img-blog.csdn.net/20181012222042844?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

可以安装

https://img-blog.csdn.net/20181012222110738?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Rvbmd5dWd1b2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70

很快就安装好了，程序中引用错误也消失了。

 参考：

https://blog.csdn.net/linjf520/article/details/79585081

https://blog.csdn.net/jnulzl/article/details/48207879

https://blog.csdn.net/lnc2003/article/details/54948219
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作者：dongyuguoai
来源：CSDN
原文：https://blog.csdn.net/dongyuguoai/article/details/83033639
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