强制 Nuget 包使用特定版本的子依赖项？

Question

When installing the two Nuget packages Hl7.Fhir.DSTU2 and Hl7.Fhir.R4, we get something like this:

The package DSTU2 seems to have issues using Hl7.Fhir.Support.Poco version 3.4.0. If we install DSTU2 on it's own, all packages are using the version 1.9.0.

Is there a way in the .csproj file to specify sub dependencies versions and have the .dll installed in specific folders?

Here are the 3.4.0 versions .dll in my debug folder

Answer 1

Yes, you just add a PackageReference in your project for the transitive dependency as well. NuGet picks a single version to use for each package you depend on, and if you have a direct reference to a package then NuGet will always pick this version due to its nearest wins rule .

As you've spotted though, this can't be a lower version than any of your dependencies require themselves, or you get a package downgrade error . This is intentional - if you reference packageA which says it needs at least a particular version of packageB , then given that you can only use one version of each package it stands to reason that you need at least that version of packageB .