Could not install package '--'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5'

Question

I created this package, I need it in a project but couldn't install it, this error appears:

Could not install package 'Mshwf.NiceLinq 1.0.9'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author

I don't know why this happen, in another project (Console) I changed the framework to 4.6 and other versions and it wasn't a problem, but this only happen in this project (MVC and Web API):

this is the nuspec file:

<?xml version="1.0"?>
<package >
  <metadata>
    <id>Mshwf.NiceLinq</id>
    <version>1.0.9</version>
    <title>Nice LINQ</title>
    <authors>MShawaf</authors>
    <owners>Mshawaf</owners>
    <projectUrl>https://github.com/mshwf/NiceLinq</projectUrl>
    <iconUrl>https://raw.githubusercontent.com/mshwf/NiceLinq/master/logo.png</iconUrl>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>See it as: WHERE ID IN (1, 2, 3, 7, 9, 22, 30, 101)</description>
    <releaseNotes>Minor changes.</releaseNotes>
    <copyright>Copyright 2016</copyright>
    <tags>LINQ IEnumerable Where Contains Search Filter</tags>
  </metadata>
</package>

Answer 1

Your package targets NETFramework,Version=v4.5.2. That means the assembly folder is lib\net452. You are trying to install the package to a higher framework (greater than 4.5) project. Create a project with framework 4.5.2 or rename the package's lib folder from net452 to the version which you want to target like net45 or net46.

You can target multiple framework too from a single package.

Edit your csproj file like this:

<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>

Refer here: https://docs.microsoft.com/en-us/nuget/create-packages/supporting-multiple-target-frameworks

For a complete, up-to-date list of target framework names, refer to https://docs.microsoft.com/en-us/nuget/reference/target-frameworks#supported-frameworks