Upload NuGet package, how to set the license? - nuget

Question

I'm trying to upload a new NuGet package on the website.
https://www.nuget.org/packages/manage/upload
On the first attemp I received an error that says I need to specify the license.
I don't want but... ok.
So, my first attempt with a specified license failed. I read the linked documentation and I tried multiple times.
I tried with a <license> property and also including a license.txt file in the package.
These are my try with the .nuspec file and the error I receive:
<license type="MIT"/>
=> Error: Unsupported license type 'MIT'.
(I know it is wrong but I found this "example" here: https://github.com/NuGet/Home/wiki/Packaging-License-within-the-nupkg)
<license type="expression">MIT</license>
=> Error: To provide a better experience for older clients when a license expression is specified, must be set to 'https://licenses.nuget.org/MIT'.
<license type="expression">BSD-2-Clause OR MIT</license>
=> Error: To provide a better experience for older clients when a license expression is specified, must be set to 'https://licenses.nuget.org/BSD-2-Clause%20OR%20MIT'.
<license type="expression">https://licenses.nuget.org/MIT</license>
=> Error: Invalid license metadata: The license expression 'https://licenses.nuget.org/MIT' contains invalid characters.
I also tried with my license.txt without success.
What I'm doing exactly is: modify the mylibrary.nuspec file contained in a generated mylibrary.nupkg adding the <license> field.
Why? Because this VS studio project generatse the package using nuget.exe mylibrary.csproj file, and it does not contains the license.
I updated nuget.exe to the latest 5.1 version, but I don't want to modify the VS solution or project.
Any idea ?

Answer 1

Edit the .csproj file. Add the following:
Using License file:
<PropertyGroup>
<PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<None Include="licenses\LICENSE.txt" Pack="true"
PackagePath="LICENSE.txt"/>
</ItemGroup>
Using PackageLicenseExpression:
<PropertyGroup>
<PackageLicenseExpression>MIT</PackageLicenseExpression>
</PropertyGroup>
For more details, see

Answer 2

In my case I had to set two properties:
PackageLicenseUrl - https://licenses.nuget.org/MIT
PackageLicenseExpression - MIT