.NET Framework：如何更新 System.Runtime？

Question

I have a DLL compiled from a project of type "Class Library" which has a target framework of netcoreapp3.1 (EDIT: now netstandard2.0 ).

I then reference this DLL in another project, a Windows Forms application, which targets .NET Framework 4.7.2 (EDIT: now 4.8 ).

When trying to compile the Windows Forms application, I get the following error:

Error CS1705: Assembly 'BC' with identity 'BC, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' uses 'System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

I would like to update System.Runtime on the WinForms project to use version 4.2.2.0 (which is apparently required by my DLL), however, I found no way to do so - there are no NuGet packages installed and the references section in Visual Studio doesn't seem to include System.Runtime directly:

How do I update System.Runtime and resolve the error?

Answer 1

Try any of the following:

• Upgrade your WinForms project to .NET 4.8, because there have been a lot of compatibility fixes in that release. .NET 4.8 still has issues when interfacing with .NET Core libs, but many problems will just be gone.

• Or try changing your library to .netstandard2.0. Then it should always be compatbile to Net Framework.

For best compatiblity, try doing both: Setting the library to .netstandard2.0 and change the WinForms app to .NET 4.8.