Type or namespace "QRCode" could not be found in new Blazor Server .Net 6 App

[brentminder]

Type of issue

[X] Bug

Expected Behavior

I'm trying your sample code for QRCoder, and the "QRCode" reference in the code should be found from the using statement: @using QRCoder ... QRCode qrCode = new QRCode(qrCodeData);

Current Behavior

I'm getting type or namespace" QRCode "could not be found in a brand new Blazor Server .Net 6 app using your sample code: @using QRCoder ... QRCode qrCode = new QRCode(qrCodeData);

Steps to Reproduce (for bugs)

Create a blazor server app and paste this code into the index.razor page:

@page "/"
@using QRCoder
@using System.Drawing
<h1>Hello, world!</h1>
@code {
    protected async override Task OnInitializedAsync()
    {
	QRCodeGenerator qrGenerator = new QRCodeGenerator();
	QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
	QRCode qrCode = new QRCode(qrCodeData);
	Bitmap qrCodeImage = qrCode.GetGraphic(20);
	await base.OnInitializedAsync();
    }
}

Your Environment

VS 2022 latest Nuget QRCoder latest: <PackageReference Include="QRCoder" Version="1.4.3" /> .NET 6 Blazor Server

[2014fighting]

I have the same problem in version 1.4.3 and use .NET 6

[wengtad]

I having the same problem in version 1.4.3 and .NET 6. So I downgraded to 1.4.2. Reference: #361

[alstan]

Same here, I had to downgrade.

[heidgert]

I experienced the same when upgrading my class lib to .NET 6. Was able to make it work by setting Target OS to Windows on project settings but I would prefer not having to do this, if possible.

[cyberdarius]

Here explanations and possible solutions.

https://github.com/codebude/QRCoder/issues/361#issuecomment-992152570

[Anduin2017]

Same here.

[Strudus]

I having the same problem in version 1.4.3 and .NET 6. So I downgraded to 1.4.2. Reference: #361

Work for me by downgrading the version to the 1.4.2

[1973-clinton]

You can try:

PngByteQrCode OR BitmapByteQrCode

[philipp-koch]

For those wondering how to display a QR code in Blazor WASM using .NET 6+, you might want to try this:

@using QRCoder

<img src=@("data:image/png;base64," + System.Convert.ToBase64String(
 PngByteQRCodeHelper.GetQRCode("text you want displayed as QR code", QRCodeGenerator.ECCLevel.Q, 10))) />

[AmeerIT]

For those wondering how to display a QR code in Blazor WASM using .NET 6+, you might want to try this:

@using QRCoder

<img src=@("data:image/png;base64," + System.Convert.ToBase64String(
 PngByteQRCodeHelper.GetQRCode("text you want displayed as QR code", QRCodeGenerator.ECCLevel.Q, 10))) />

after downgrading to 1.4.2, this inline code worked, thanks for the suggestion