Visual Studio NuGet无法还原包

Question

I have a large project that has about a dozen dependencies. I have tried to install them all but ran into an error from VS. I am using Visual Studio 2015

"An error occurred while trying to restore packages: Unable to find version '3.0.3.1' of package'Lucene.Net.Core'."

Now I have a solution which I can use that is by the same name as this package, but VS refuses to let me updates, remove, or change ANYTHING related to these packages and asks that I restore the packages. I am entirely lost here friends, what should I do?

PS the two sources I am using for my package sources are:

https://www.nuget.org/api/v2/

https://www.nuget.org/api/v2/curated-feeds/microsoftdotnet/

The same error occurs for Lucene.Net.Contrib, pstsdk.net, and various packages.

Answer 1

One thing to check for is if your project is built on a version of the NET framework that is less than or equal to the target framework the package has.

If your project is a NET 4.5 based project, but the nuget package has a NET 4.5.2... then the package manager will error out.

Answer 2

"An error occurred while trying to restore packages: Unable to find version '3.0.3.1' of package'Lucene.Net.Core'."

When I use the packages sources which you provided, I found that only two versions (4.8.0 & 4.9.0) of package"Lucene.Net.Core" not have the version '3.0.3.1'.

Pay Attention:

I noticed that the author of this package have updated this package at March 11, 2017(3/11/2017), and only release the version 4.8.0 & 4.9.0 . So this must be the reason for NuGet restore failed.

Besides, you said:

I have a solution which I can use that is by the same name as this package, but VS refuses to let me updates, remove, or change ANYTHING related to these packages

If you want to remove those error packages, you can try to use below command to force uninstall those packages:

Uninstall-Package Lucene.Net.Core -Force

Or you can delete this package from the package folder and delete the package list from the package.config.

Then install the correct version of the packages.

Answer 3

要检查的另一件事是Visual Studio中的程序包管理器配置设置列出了公共nuget提要（以及是否也启用了提要）。

Answer 4

Although I was not able to get any of the posted answers to work, I ended up removing the project entirely and reinstalling VS, my project, and its dependencies. This ended up working.