如果我的 aspnet mvc 应用程序以“.NET Core 3.1”为目标，它会针对哪个版本运行？

Question

I recently updated our .net core asp.net mvc app, in the project properties, the Target Framework is ".NET Core 3.1". In the.csproj file I see:

<TargetFramework>netcoreapp3.1</TargetFramework>

At the time I built it the specific version was 3.1.3 which was listed as LTS (long term support).
If I expand the Dependencies -> then Frameworks -> right click on Microsoft.AspNetCore.App -> properties I see:

Version    3.1.3

QA tested the app and were preparing to release it.

But in the weeks that have followed, I noticed Microsoft released 3.1.4 (now listed as LTS). I'm confused on the issue of which version of .NET Core my app can run against in deployment.

Can the app run in a customer/deployment environment that has 3.1.4 installed since I never specified 3.1.3 explicitly . Or can it only run against 3.1.3 because that was the latest on my machine when I built it?

Thanks for the help, I feel stupid for not knowing this.

Answer 1

You misunderstood the LTS concept, https://dotnet.microsoft.com/platform/support/policy/dotnet-core

The only key point is that "Customers choosing LTS will need the latest patch update installed to qualify for support". You can use whatever patch version (3.1.x) till you need to upgrade to the latest when receiving support services from Microsoft. You should try to upgrade often to the latest patch version though, as it ships security updates.

Different deployment approaches (framework dependent or self-contained) also have impact on how you upgrade for yourself or your customers, but that's rather lengthy to discuss. You'd better set up a few experiments in a lab environment to explore further.