.NET 6.0 Compilation Error: The type or namespace name 'QRCode' does not exist in the namespace 'QRCoder'

[Illeris]

Type of issue

[X] Bug
[ ] Question (e.g. about handling/usage)
[ ] Request for new feature/improvement

Expected Behavior

.NET 5.0 project with QRCoder assembly reference compiles without error.
.NET 6.0 project with QRCoder assembly reference does not compile : The type or namespace name 'QRCode' does not exist in the namespace 'QRCoder'

Current Behavior

Possible Solution (optional)

Steps to Reproduce (for bugs)

• Include library in .NET 5.0 assembly project
• Include QRCoder (sth like this):
  QRCoder.QRCodeGenerator qrGenerator = new QRCoder.QRCodeGenerator();
  QRCoder.QRCodeData qrCodeData = qrGenerator.CreateQrCode(payloadMessage, eccLevel);
  QRCoder.QRCode qrCode = new QRCoder.QRCode(qrCodeData);
• Compile : will work
• Switch target of project to .NET 6.0 : error

Compilation: VS2022

Your Environment

[danielhw2]

Same problem here...

[MarkNorman]

Also seeing this.

[WatchDogsDev]

Also here. Any solution for this ?

[joseph-passineau]

Here is the explanation and some possible solutions:
#361 (comment)

[chrpai]

I'm new here but my experience was like this....

I need to create a program to generate some QR codes. Ok new console app and take default of .net 6.
Open nuget... this was has 8M downloads lets give it a try. Go to the project and find the 5 line sample and paste it in.
Hmmm that's strange this type isn't recognized.
Go to issues page and find this issue. Switch to target windows only and not it compiles.

So I'd that a notation be placed in the README.md for newcomers like myself.

[wensaint]

roll back to 1.4.1, then the error gone.

[akosilataunglahat]

roll back to 1.4.1, then the error gone.

This works for me. Thank you @wensaint .. :)

[lvlvlvlvlvlv]

QRCode qrcode = new QRCode(codeData); ?????

[PeterHric]

QRCode qrcode = new QRCode(codeData); ?????

Actually no - I had to take it back..
Apparently I solved it other way.. Dunno how :)

[simonpinn]

Same issue #435

[ruggedwizard]

rollback to version 1.4.1, this fixes the QRCode issues on Dotnet 6.0 and also 7.0

[SeniorKian]

ruggedwizard

thank you ...

[KC7465128305]

I found the problem.

Go to the project properties, in the Target OS, specify it to Windows. Rebuild the solution. Problem solved.

[jainam33]

Just switch to Nuget package manager version 1.4.1
first uninstall latest version of QRCoder then install 1.4.1