QRGenerator | QR Generator Library | QRCode Processing library

The following shows how to create a PDF document that has one QR code per page using NuGet packages iTextSharp and QRCoder. Most of the code is from the OP, however it needed to be rearranged. I added code to allow the size of the QR code to be specified. The code used for testing is included.

The following assumes that you're using a VB.NET ASP.NET Web Application (.NET Framework) project. For testing, I used the Empty project template. Under "Add folders & core references", I checked Web Forms. Under "Advanced", I unchecked Configure for HTTPS.

Open Solution Explorer

• In VS menu, click View
• Select Solution Explorer

Download/install NuGet packages:

• In Solution Explorer, right-click
• Select Manage NuGet Packages...
• Click Browse
• Search: QRCoder
• Select desired version (ex: 1.4.1)
• Click Install
• Search: iTextSharp
• Select desired version (ex: 5.5.13.2)
• Click Install

Add Webform (name: default.aspx)

• In VS menu, click Project
• Select Add New Item...
• Select Web Form (name: default.aspx)
• Click Add

default.aspx

For one, make your life easier by changing your parameter list in c# to a single class (in my example DTO just means Data Transfer Object):

The base64 value you provided in your question is malformed, my recommendation is to not use Json Serialization for this Api response effort.

Try using Convert.ToBase64String

• Ensure the method returns string
• and the jQuery request accepts/expects text for dataType response.

Does support the framework.net 3.5 default value in the method

The .NET Framework supports optional parameters in version 3.5 (in terms of the attributes being part of the framework), but the C# 3 compiler (which is what Visual Studio 2008 uses) doesn't. Optional parameters and named arguments were introduced in C# 4.

I would strongly recommend using a modern version of Visual Studio, even if you still need to target ancient versions of .NET. (I'd also strongly recommend moving off unsupported versions of .NET if at all possible.)

Your question should be approached as "How do I add text to a Bitmap?", and there are answers for it here: c# write text on bitmap

Instead of posting an object to the database, which is being sent as a string of some kind, you need to actually send the bytes.

Also it's a good idea to define the parameter with an explicit data type to avoid C# guessing (incorrectly) at your required data type as it has done to you here.

Replace:

Use @State

A background (hosted) service is a completely different service, using its own thread to do its job. You can't have your controller "run" something on that service, you have to tell it what to do, and have it do it.

The Background tasks with hosted services section in the docs shows two different ways a long running background service can work :

• A timed service can run each time a timer fires and do a periodic job, as long as the application is running
• A queued service waits for messages in a queue and performs a job when a message arrives

Sending an email fits into the second case. You could use the documentation example almost as-is. You can create an IBackgroundTaskQueue interface that clients like your controller can use to submit jobs to run in the background:

If you're using loadUi (or setupUi if you're using files generated by pyuic), all elements in the object inspector (the tree view that lists all widgets on your UI) become available as instance attributes, according to their object name.

So, if your action is called actionQuit_FromProgram in the inspector, you can directly access it using self.actionQuit_FromProgram.

This also means that:

• all those findChild are absolutely useless: you already have access to self.qrgenerator, self.qredit, etc;
• in any case, findChild should be used with the correct class of the object you're looking for: I sincerely doubt that actionQuit_FromProgram is a QMenuBar (so, using findChild(QMenuBar, ...) won't work at all; if it is an action, use findChild(QAction, ...); if it's a submenu, use findChild(Qmenu, ...);
• there's usually just one menu bar for each QMainWindow, and it is easily accessible using self.menuBar();