C# QR Code Generator Application

Actualizado:agosto 20, 2025

Translated

View the article in English

IronQR is Iron Software's brand new .NET QR Code library. Leverage cutting edge machine learning techniques to read QR codes from any angle with 99.99% accuracy. Generate and customize new QR codes with ease! Get started with IronQR now!

Welcome to our guide on creating QR codes using C#! QR codes and .NET barcode DLL have become popular ways to share information quickly and efficiently. Whether you're developing an app, managing a website, or just looking for a neat way to share links, these codes can be incredibly useful. In this guide, we'll demonstrate how to generate QR codes efficiently using IronQR, ensuring you can generate QR codes tailored to your needs. This library makes it easy for anyone working with C# to create QR codes without getting into complex logic. We'll walk you through the steps, ensuring you have everything you need to get started. Whether you're looking to add QR code generator functionality to your app or just curious about how it's done, you're in the right place. Let's get started.

How to Create a QR Code Generator In C#

Create a Windows Forms Application in Visual Studio
Install QR Library using NuGet
Design the form frontend elements
Write logic of QR generation
Run the application and start creating QR codes

Install QR Code Generator Library in C#

Comience a usar IronQR en su proyecto hoy con una prueba gratuita.

Primer Paso:

Before we start, we need to install the IronQR NuGet Package.

Install-Package IronQR

IronQR: C# QR Library

IronQR is a C# QR Code library for integrating QR code functionality into .NET applications. IronQR supports a wide range of .NET versions and project types, including C#, VB.NET, F#, .NET Core, .NET Standard, .NET Framework, and more, ensuring compatibility with various development environments such as Windows, Linux, macOS, iOS, and Android.

IronQR distinguishes itself with its advanced features, including the ability to read QR codes and generate QR codes, support for multiple image formats, and customization options like resizing, styling, and adding logos to QR codes.

Some Key Features of IronQR

IronQR extends its functionality beyond basic QR code generation, offering several features designed to accommodate a wide range of QR code-related tasks. Let's go through these features and check their example codes which you will be able to integrate into any type of .NET application template like console app.

Read QR Codes

IronQR excels in decoding QR codes, providing users with a straightforward way to access the information embedded within QR codes. You can quickly and accurately extract data from QR codes, ranging from simple URLs to complex embedded information.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-1.cs

using IronQr;
using IronSoftware.Drawing;
using System;
using System.Collections.Generic;

IronQr.License.LicenseKey = "License-Key";

// Load the image file that contains the QR Code
var inputImage = AnyBitmap.FromFile("QRCode.png");

// Prepare the image for QR code detection
QrImageInput qrInput = new QrImageInput(inputImage);

// Initialize the QR Code reader
QrReader qrReader = new QrReader();

// Execute QR Code reading on the provided image
IEnumerable<QrResult> qrResults = qrReader.Read(qrInput);

// Assuming you have the QR results in qrResults as before
foreach (var result in qrResults)
{
    Console.WriteLine(result.Value); // Print the QR code content to the console
}

Imports IronQr
Imports IronSoftware.Drawing
Imports System
Imports System.Collections.Generic

IronQr.License.LicenseKey = "License-Key"

' Load the image file that contains the QR Code
Dim inputImage = AnyBitmap.FromFile("QRCode.png")

' Prepare the image for QR code detection
Dim qrInput As New QrImageInput(inputImage)

' Initialize the QR Code reader
Dim qrReader As New QrReader()

' Execute QR Code reading on the provided image
Dim qrResults As IEnumerable(Of QrResult) = qrReader.Read(qrInput)

' Assuming you have the QR results in qrResults as before
For Each result In qrResults
	Console.WriteLine(result.Value) ' Print the QR code content to the console
Next result

$vbLabelText $csharpLabel

The process starts by incorporating the necessary namespaces: IronQr and IronSoftware.Drawing, with a specific mention of Color from the IronSoftware.Drawing namespace to handle image manipulations.

Before diving into the QR code reading process, it's essential to activate the software with your license key by assigning it to IronQr.License.LicenseKey. The code then proceeds to load the QR code image from a file using AnyBitmap.FromFile("QRCode.png").

With the image loaded, the next step involves preparing it for QR code detection. This preparation is done by creating a QrImageInput object, which serves as a container for the image.

The core of this feature lies in the QrReader class, which is instantiated and used to perform the QR code reading operation. The reader analyzes the prepared image, searching for any QR codes it contains. The result of this operation is a collection of QrResult objects, each representing a detected QR code within the image.

To access and utilize the data encoded in the QR codes, the code iterates over the collection of results using a foreach loop. Each QrResult object contains properties such as the QR code's value, which can be accessed and displayed.

Custom QR Read Mode Options

IronQR provides different modes for reading QR codes, making it versatile for various needs.

Mixed Scan Mode: Balances speed and accuracy, useful for QR codes that are not clear or partly hidden.
Machine Learning (ML) Scan Mode: Uses advanced technology to read damaged or hard-to-read QR codes, ideal for difficult-to-detect scenarios.
Basic Scan Mode: The simplest and fastest way, for clear and straightforward QR codes.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-2.cs

using IronQr;
using IronQr.Enum;
using IronSoftware.Drawing;
using System.Collections.Generic;

IronQr.License.LicenseKey = "License-Key";

// Load the image file that contains the QR Code
var inputImage = AnyBitmap.FromFile("QRCode.png");

QrImageInput mixedScanInput = new QrImageInput(inputImage, QrScanMode.OnlyDetectionModel);
IEnumerable<QrResult> mixedScanResults = new QrReader().Read(mixedScanInput);

QrImageInput mlScanInput = new QrImageInput(inputImage, QrScanMode.OnlyDetectionModel);
IEnumerable<QrResult> mlScanResults = new QrReader().Read(mlScanInput);

QrImageInput basicScanInput = new QrImageInput(inputImage, QrScanMode.OnlyBasicScan);
IEnumerable<QrResult> basicScanResults = new QrReader().Read(basicScanInput);

Imports IronQr
Imports IronQr.Enum
Imports IronSoftware.Drawing
Imports System.Collections.Generic

IronQr.License.LicenseKey = "License-Key"

' Load the image file that contains the QR Code
Dim inputImage = AnyBitmap.FromFile("QRCode.png")

Dim mixedScanInput As New QrImageInput(inputImage, QrScanMode.OnlyDetectionModel)
Dim mixedScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(mixedScanInput)

Dim mlScanInput As New QrImageInput(inputImage, QrScanMode.OnlyDetectionModel)
Dim mlScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(mlScanInput)

Dim basicScanInput As New QrImageInput(inputImage, QrScanMode.OnlyBasicScan)
Dim basicScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(basicScanInput)

$vbLabelText $csharpLabel

Read Advanced QR Codes

IronQR's advanced QR code reading capabilities provide a comprehensive approach to QR code scanning and decoding. This feature set goes beyond basic reading, offering a deeper level of interaction and data extraction.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-3.cs

using IronQr;
using IronSoftware.Drawing;
using System;
using System.Collections.Generic;

IronQr.License.LicenseKey = "License-Key";

var imageToScan = AnyBitmap.FromFile("QRCode.png");

QrImageInput qrInput = new QrImageInput(imageToScan);

QrReader qrScanner = new QrReader();

IEnumerable<QrResult> scanResults = qrScanner.Read(qrInput);

foreach (QrResult qrResult in scanResults)
{

    Console.WriteLine(qrResult.Value);

    Console.WriteLine(qrResult.Url);

    foreach (IronSoftware.Drawing.PointF coordinate in qrResult.Points)
    {
        Console.WriteLine($"{coordinate.X}, {coordinate.Y}");
    }
}

Imports IronQr
Imports IronSoftware.Drawing
Imports System
Imports System.Collections.Generic

IronQr.License.LicenseKey = "License-Key"

Dim imageToScan = AnyBitmap.FromFile("QRCode.png")

Dim qrInput As New QrImageInput(imageToScan)

Dim qrScanner As New QrReader()

Dim scanResults As IEnumerable(Of QrResult) = qrScanner.Read(qrInput)

For Each qrResult As QrResult In scanResults

	Console.WriteLine(qrResult.Value)

	Console.WriteLine(qrResult.Url)

	For Each coordinate As IronSoftware.Drawing.PointF In qrResult.Points
		Console.WriteLine($"{coordinate.X}, {coordinate.Y}")
	Next coordinate
Next qrResult

$vbLabelText $csharpLabel

To create a QR Code generator using the IronQR library in a C# application, follow these steps carefully. This guide will take you through setting up a Windows form application, installing the IronQR library, writing the code to generate a QR code, and understanding the output.

Step 1: Create a Windows Application in Visual Studio

Start by launching Visual Studio on your computer.
Click on the "Create a New Project" button.
Select Windows Forms App as the project type. Make sure to choose C# as the language.
Enter a name for your project and select the location to save it. Then on the next screen, select .NET framework. Then click Create.

Step 2: Install IronQR Library

Now it's time to install the IronQR library in the project. You can install the IronQR library through different methods.

Install using NuGet Package Manager

Right-click on your project in the Solution Explorer and select Manage NuGet Packages.
Type IronQR in the search box and press Enter.
Find IronQR in the list and click Install next to it.

Install using NuGet Package Manager Console

Go to Tools > NuGet Package Manager > Package Manager Console.

Type Install-Package IronQR and press Enter.

Step 3: Design Frontend

3.1 Title Header

Upon launching the QR Code Generator application, users are immediately presented with a striking header titled "QR Generator IronQR," set in a bold and authoritative font.

3.2 Input Section

Text Input for QR Code

Users can enter the data they wish to encode into their QR code.

Logo Selection

The "Select Logo" area allows for an additional layer of customization. Users can upload a logo that will be embedded in the QR code.

Color Configuration

Buttons for color selection allow users to customize their QR code's palette.

3.3 Styling Parameters

Dimension Settings

Allows users to specify the overall size of the QR code.

Margin Settings

Allows users to specify the white space surrounding the QR code.

3.4 Output Preview

Provides a real-time preview of the generated QR code.

3.5 Action Buttons

Generate QR

Triggers the QR code creation process.

Save QR Code

Opens a save dialog for saving the QR code.

Reset Form

Clears all previous inputs and selections.

Step 4: Write Backend Logic

4.1 Setup and Initialization

Includes necessary namespaces: IronQr and IronSoftware.Drawing.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-4.cs

using IronQr;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

Imports IronQr
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

$vbLabelText $csharpLabel

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-5.cs

public QR_Generator()
{
    InitializeComponent();
    SetLicenseKey();
    EnsureDirectoryExists(qrCodesDirectory);
}

'INSTANT VB WARNING: The following constructor is declared outside of its associated class:
'ORIGINAL LINE: public QR_Generator()
Public Sub New()
	InitializeComponent()
	SetLicenseKey()
	EnsureDirectoryExists(qrCodesDirectory)
End Sub

$vbLabelText $csharpLabel

4.2 License Key Configuration

Applies a valid license key for the IronQR library:

private static void SetLicenseKey() {
    IronQr.License.LicenseKey = "YOUR_LICENSE_KEY";
}

private static void SetLicenseKey() {
    IronQr.License.LicenseKey = "YOUR_LICENSE_KEY";
}

Private Shared Sub SetLicenseKey()
	IronQr.License.LicenseKey = "YOUR_LICENSE_KEY"
End Sub

$vbLabelText $csharpLabel

Replace "YOUR_LICENSE_KEY" with your actual license key.

4.3 Directory Management

Checks or creates necessary directories.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-7.cs

private static void EnsureDirectoryExists(string path)
{
    if (!System.IO.Directory.Exists(path))
    {
        System.IO.Directory.CreateDirectory(path);
    }
}

Private Shared Sub EnsureDirectoryExists(ByVal path As String)
	If Not System.IO.Directory.Exists(path) Then
		System.IO.Directory.CreateDirectory(path)
	End If
End Sub

$vbLabelText $csharpLabel

The path to the QR codes directory is defined in the QR_Generator class constructor as qrCodesDirectory, which combines the application's startup path with a "QR Codes" folder name:

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-8.cs

string qrCodesDirectory = System.IO.Path.Combine(Application.StartupPath, "QR Codes");

Dim qrCodesDirectory As String = System.IO.Path.Combine(Application.StartupPath, "QR Codes")

$vbLabelText $csharpLabel

4.4 Color Selection

Provides color dialog components and utility functions.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-9.cs

private string ColorToHex(System.Drawing.Color color)
{
    return $"#{color.R:X2}{color.G:X2}{color.B:X2}";
}

Private Function ColorToHex(ByVal color As System.Drawing.Color) As String
	Return $"#{color.R:X2}{color.G:X2}{color.B:X2}"
End Function

$vbLabelText $csharpLabel

The UpdateColor method takes the selected color and converts it to the IronSoftware.Drawing.Color format using the hexadecimal string, and updates either the QR code's foreground or background color depending on the selection. It also updates the UI to reflect the new color choice:

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-10.cs

private void UpdateColor(ref Color targetColor, Control display, bool isBackground)
{
    if (select_color.ShowDialog() == DialogResult.OK)
    {
        var hexColor = ColorToHex(select_color.Color);
        targetColor = new Color(hexColor);
        display.BackColor = select_color.Color;
    }
}

Private Sub UpdateColor(ByRef targetColor As Color, ByVal display As Control, ByVal isBackground As Boolean)
	If select_color.ShowDialog() = DialogResult.OK Then
		Dim hexColor = ColorToHex(select_color.Color)
		targetColor = New Color(hexColor)
		display.BackColor = select_color.Color
	End If
End Sub

$vbLabelText $csharpLabel

4.5 Adding Logo

Allows the user to select a logo.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-11.cs

private void btn_logo_Click(object sender, EventArgs e)
{
    if (select_logo.ShowDialog() == DialogResult.OK)
    {
        try
        {
            logoBmp = new AnyBitmap(select_logo.FileName);
            selected_logo.Image = Image.FromFile(select_logo.FileName);
        }
        catch (Exception ex)
        {
            ShowError("An error occurred while loading the logo", ex.Message);
        }
    }
}

Private Sub btn_logo_Click(ByVal sender As Object, ByVal e As EventArgs)
	If select_logo.ShowDialog() = DialogResult.OK Then
		Try
			logoBmp = New AnyBitmap(select_logo.FileName)
			selected_logo.Image = Image.FromFile(select_logo.FileName)
		Catch ex As Exception
			ShowError("An error occurred while loading the logo", ex.Message)
		End Try
	End If
End Sub

$vbLabelText $csharpLabel

4.6 QR Code Generation

Contains logic for generating QR codes based on user inputs.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-12.cs

private void btn_generate_Click(object sender, EventArgs e)
{
    GenerateQRCode();
}

Private Sub btn_generate_Click(ByVal sender As Object, ByVal e As EventArgs)
	GenerateQRCode()
End Sub

$vbLabelText $csharpLabel

The QrOptions object defines the error correction level, enhancing the QR code's resilience to damage or obscuration. The CreateStyleOptions method generates a QrStyleOptions object, which includes the user's custom settings like colors, dimensions, and the logo. Here's the method in detail:

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-14.cs

private QrStyleOptions CreateStyleOptions()
{
    return new QrStyleOptions
    {
        BackgroundColor = bgColor,
        Color = color,
        Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"),
        Margins = Convert.ToInt32(txt_margin.Value),
        Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null
    };
}

Private Function CreateStyleOptions() As QrStyleOptions
'INSTANT VB TODO TASK: Throw expressions are not converted by Instant VB:
'ORIGINAL LINE: return new QrStyleOptions { BackgroundColor = bgColor, Color = color, Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"), Margins = Convert.ToInt32(txt_margin.Value), Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null };
	Return New QrStyleOptions With {
		.BackgroundColor = bgColor,
		.Color = color,
		.Dimensions = If(txt_dimension.Value > 0, Convert.ToInt32(txt_dimension.Value), throw New ArgumentException("Please select valid dimensions!")),
		.Margins = Convert.ToInt32(txt_margin.Value),
		.Logo = If(logoBmp IsNot Nothing, New QrLogo With {
			.Bitmap = logoBmp,
			.Width = 50,
			.Height = 50,
			.CornerRadius = 5
		}, Nothing)
	}
End Function

$vbLabelText $csharpLabel

4.7 Saving the QR Code

Handles saving the generated QR code.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-15.cs

private void btn_save_Click(object sender, EventArgs e)
{
    SaveQRCode();
}

private void SaveQRCode()
{
    if (pictureBox.Image == null)
    {
        MessageBox.Show("There is no QR code to save.", "Error");
        return;
    }

    saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg";
    saveFileDialog.Title = "Save QR Code";
    saveFileDialog.FileName = "QRCode";

    if (saveFileDialog.ShowDialog() == DialogResult.OK)
    {
        try
        {
            pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName));
            MessageBox.Show("QR Code has been saved!", "Success");
        }
        catch (Exception ex)
        {
            ShowError("An error occurred while saving the QR code", ex.Message);
        }
    }
}

Private Sub btn_save_Click(ByVal sender As Object, ByVal e As EventArgs)
	SaveQRCode()
End Sub

Private Sub SaveQRCode()
	If pictureBox.Image Is Nothing Then
		MessageBox.Show("There is no QR code to save.", "Error")
		Return
	End If

	saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg"
	saveFileDialog.Title = "Save QR Code"
	saveFileDialog.FileName = "QRCode"

	If saveFileDialog.ShowDialog() = DialogResult.OK Then
		Try
			pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName))
			MessageBox.Show("QR Code has been saved!", "Success")
		Catch ex As Exception
			ShowError("An error occurred while saving the QR code", ex.Message)
		End Try
	End If
End Sub

$vbLabelText $csharpLabel

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-16.cs

private System.Drawing.Imaging.ImageFormat DetermineImageFormat(string filePath)
{
    return System.IO.Path.GetExtension(filePath).ToLower() == ".jpg" ? System.Drawing.Imaging.ImageFormat.Jpeg : System.Drawing.Imaging.ImageFormat.Png;
}

Private Function DetermineImageFormat(ByVal filePath As String) As System.Drawing.Imaging.ImageFormat
	Return If(System.IO.Path.GetExtension(filePath).ToLower() = ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg, System.Drawing.Imaging.ImageFormat.Png)
End Function

$vbLabelText $csharpLabel

4.8 Resetting the Application

Clears user inputs and resets the form state.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-17.cs

private void btn_reset_Click(object sender, EventArgs e)
{
    ResetFields();
}

private void ResetFields()
{
    txt_QR.Text = string.Empty;
    txt_dimension.Value = 200;
    txt_margin.Value = 0;
    bgColor = Color.White;
    color = Color.Black;
    txt_selected_color.BackColor = System.Drawing.Color.White;
    txt_selected_bgcolor.BackColor = System.Drawing.Color.Black;
    logoBmp = null;
    selected_logo.Image = null;
    pictureBox.Image = null;
}

Private Sub btn_reset_Click(ByVal sender As Object, ByVal e As EventArgs)
	ResetFields()
End Sub

Private Sub ResetFields()
	txt_QR.Text = String.Empty
	txt_dimension.Value = 200
	txt_margin.Value = 0
	bgColor = Color.White
	color = Color.Black
	txt_selected_color.BackColor = System.Drawing.Color.White
	txt_selected_bgcolor.BackColor = System.Drawing.Color.Black
	logoBmp = Nothing
	selected_logo.Image = Nothing
	pictureBox.Image = Nothing
End Sub

$vbLabelText $csharpLabel

4.9 Error Handling

Displays error messages to users.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-18.cs

private static void ShowError(string title, string message)
{
    MessageBox.Show($"{title}: {message}", "Error");
}

Private Shared Sub ShowError(ByVal title As String, ByVal message As String)
	MessageBox.Show($"{title}: {message}", "Error")
End Sub

$vbLabelText $csharpLabel

4.10 Complete Code Example

The full code combining all the above features can be found in the example file linked to your project.

:path=/static-assets/qr/content-code-examples/tutorials/csharp-qr-code-generator-application-19.cs

using IronQr;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

namespace IronQR_QR_Generator_WinForms
{
    public partial class QR_Generator : Form
    {
        string qrCodesDirectory = System.IO.Path.Combine(Application.StartupPath, "QR Codes");
        Color bgColor = Color.White;
        Color color = Color.Black;
        AnyBitmap? logoBmp = null;

        public QR_Generator()
        {
            InitializeComponent();
            SetLicenseKey();
            EnsureDirectoryExists(qrCodesDirectory);
        }

        private static void SetLicenseKey()
        {
            IronQr.License.LicenseKey = "License-Key";
        }

        private static void EnsureDirectoryExists(string path)
        {
            if (!System.IO.Directory.Exists(path))
            {
                System.IO.Directory.CreateDirectory(path);
            }
        }

        private void btn_color_Click(object sender, EventArgs e)
        {
            UpdateColor(ref color, txt_selected_color, false);
        }

        private void btn_background_Click(object sender, EventArgs e)
        {
            UpdateColor(ref bgColor, txt_selected_bgcolor, true);
        }

        private string ColorToHex(System.Drawing.Color color)
        {
            return $"#{color.R:X2}{color.G:X2}{color.B:X2}";
        }
        private void UpdateColor(ref Color targetColor, Control display, bool isBackground)
        {
            if (select_color.ShowDialog() == DialogResult.OK)
            {

                var hexColor = ColorToHex(select_color.Color);
                targetColor = new Color(hexColor);
                display.BackColor = select_color.Color;
            }
        }

        private void btn_logo_Click(object sender, EventArgs e)
        {
            if (select_logo.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    logoBmp = new AnyBitmap(select_logo.FileName);
                    selected_logo.Image = Image.FromFile(select_logo.FileName);
                }
                catch (Exception ex)
                {
                    ShowError("An error occurred while loading the logo", ex.Message);
                }
            }
        }

        private void btn_generate_Click(object sender, EventArgs e)
        {
            GenerateQRCode();
        }

        private void GenerateQRCode()
        {
            try
            {
                var options = new QrOptions(QrErrorCorrectionLevel.High);
                var myQr = QrWriter.Write(txt_QR.Text, options);
                var style = CreateStyleOptions();
                var qrImage = myQr.Save(style);
                var fileName = $"{DateTime.Now:yyyyMMddHHmmssfff}_QR.png";
                var fullPath = System.IO.Path.Combine(qrCodesDirectory, fileName);
                qrImage.SaveAs(fullPath);
                pictureBox.Image = Image.FromFile(fullPath);
            }
            catch (Exception ex)
            {
                ShowError("An error occurred during QR code generation or saving", ex.Message);
            }
        }

        private QrStyleOptions CreateStyleOptions()
        {
            return new QrStyleOptions
            {
                BackgroundColor = bgColor,
                Color = color,
                Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"),
                Margins = Convert.ToInt32(txt_margin.Value),
                Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null
            };
        }

        private void btn_save_Click(object sender, EventArgs e)
        {
            SaveQRCode();
        }

        private void SaveQRCode()
        {
            if (pictureBox.Image == null)
            {
                MessageBox.Show("There is no QR code to save.", "Error");
                return;
            }

            saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg";
            saveFileDialog.Title = "Save QR Code";
            saveFileDialog.FileName = "QRCode";

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName));
                    MessageBox.Show("QR Code has been saved!", "Success");
                }
                catch (Exception ex)
                {
                    ShowError("An error occurred while saving the QR code", ex.Message);
                }
            }
        }

        private System.Drawing.Imaging.ImageFormat DetermineImageFormat(string filePath)
        {
            return System.IO.Path.GetExtension(filePath).ToLower() == ".jpg" ? System.Drawing.Imaging.ImageFormat.Jpeg : System.Drawing.Imaging.ImageFormat.Png;
        }

        private void btn_reset_Click(object sender, EventArgs e)
        {
            ResetFields();
        }

        private void ResetFields()
        {
            txt_QR.Text = string.Empty;
            txt_dimension.Value = 200;
            txt_margin.Value = 0;
            bgColor = Color.White;
            color = Color.Black;
            txt_selected_color.BackColor = bgColor;
            txt_selected_bgcolor.BackColor = color;
            logoBmp = null;
            selected_logo.Image = null;
            pictureBox.Image = null;
        }

        private static void ShowError(string title, string message)
        {
            MessageBox.Show($"{title}: {message}", "Error");
        }
    }
}

Imports IronQr
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

Namespace IronQR_QR_Generator_WinForms
	Partial Public Class QR_Generator
		Inherits Form

		Private qrCodesDirectory As String = System.IO.Path.Combine(Application.StartupPath, "QR Codes")
		Private bgColor As Color = Color.White
		Private color As Color = Color.Black
		Private logoBmp? As AnyBitmap = Nothing

		Public Sub New()
			InitializeComponent()
			SetLicenseKey()
			EnsureDirectoryExists(qrCodesDirectory)
		End Sub

		Private Shared Sub SetLicenseKey()
			IronQr.License.LicenseKey = "License-Key"
		End Sub

		Private Shared Sub EnsureDirectoryExists(ByVal path As String)
			If Not System.IO.Directory.Exists(path) Then
				System.IO.Directory.CreateDirectory(path)
			End If
		End Sub

		Private Sub btn_color_Click(ByVal sender As Object, ByVal e As EventArgs)
			UpdateColor(color, txt_selected_color, False)
		End Sub

		Private Sub btn_background_Click(ByVal sender As Object, ByVal e As EventArgs)
			UpdateColor(bgColor, txt_selected_bgcolor, True)
		End Sub

		Private Function ColorToHex(ByVal color As System.Drawing.Color) As String
			Return $"#{color.R:X2}{color.G:X2}{color.B:X2}"
		End Function
		Private Sub UpdateColor(ByRef targetColor As Color, ByVal display As Control, ByVal isBackground As Boolean)
			If select_color.ShowDialog() = System.Windows.Forms.DialogResult.OK Then

				Dim hexColor = ColorToHex(select_color.Color)
				targetColor = New Color(hexColor)
				display.BackColor = select_color.Color
			End If
		End Sub

		Private Sub btn_logo_Click(ByVal sender As Object, ByVal e As EventArgs)
			If select_logo.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
				Try
					logoBmp = New AnyBitmap(select_logo.FileName)
					selected_logo.Image = Image.FromFile(select_logo.FileName)
				Catch ex As Exception
					ShowError("An error occurred while loading the logo", ex.Message)
				End Try
			End If
		End Sub

		Private Sub btn_generate_Click(ByVal sender As Object, ByVal e As EventArgs)
			GenerateQRCode()
		End Sub

		Private Sub GenerateQRCode()
			Try
				Dim options = New QrOptions(QrErrorCorrectionLevel.High)
				Dim myQr = QrWriter.Write(txt_QR.Text, options)
				Dim style = CreateStyleOptions()
				Dim qrImage = myQr.Save(style)
				Dim fileName = $"{DateTime.Now:yyyyMMddHHmmssfff}_QR.png"
				Dim fullPath = System.IO.Path.Combine(qrCodesDirectory, fileName)
				qrImage.SaveAs(fullPath)
				pictureBox.Image = Image.FromFile(fullPath)
			Catch ex As Exception
				ShowError("An error occurred during QR code generation or saving", ex.Message)
			End Try
		End Sub

		Private Function CreateStyleOptions() As QrStyleOptions
'INSTANT VB TODO TASK: Throw expressions are not converted by Instant VB:
'ORIGINAL LINE: return new QrStyleOptions { BackgroundColor = bgColor, Color = color, Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"), Margins = Convert.ToInt32(txt_margin.Value), Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null };
			Return New QrStyleOptions With {
				.BackgroundColor = bgColor,
				.Color = color,
				.Dimensions = If(txt_dimension.Value > 0, Convert.ToInt32(txt_dimension.Value), throw New ArgumentException("Please select valid dimensions!")),
				.Margins = Convert.ToInt32(txt_margin.Value),
				.Logo = If(logoBmp IsNot Nothing, New QrLogo With {
					.Bitmap = logoBmp,
					.Width = 50,
					.Height = 50,
					.CornerRadius = 5
				}, Nothing)
			}
		End Function

		Private Sub btn_save_Click(ByVal sender As Object, ByVal e As EventArgs)
			SaveQRCode()
		End Sub

		Private Sub SaveQRCode()
			If pictureBox.Image Is Nothing Then
				MessageBox.Show("There is no QR code to save.", "Error")
				Return
			End If

			saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg"
			saveFileDialog.Title = "Save QR Code"
			saveFileDialog.FileName = "QRCode"

			If saveFileDialog.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
				Try
					pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName))
					MessageBox.Show("QR Code has been saved!", "Success")
				Catch ex As Exception
					ShowError("An error occurred while saving the QR code", ex.Message)
				End Try
			End If
		End Sub

		Private Function DetermineImageFormat(ByVal filePath As String) As System.Drawing.Imaging.ImageFormat
			Return If(System.IO.Path.GetExtension(filePath).ToLower() = ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg, System.Drawing.Imaging.ImageFormat.Png)
		End Function

		Private Sub btn_reset_Click(ByVal sender As Object, ByVal e As EventArgs)
			ResetFields()
		End Sub

		Private Sub ResetFields()
			txt_QR.Text = String.Empty
			txt_dimension.Value = 200
			txt_margin.Value = 0
			bgColor = Color.White
			color = Color.Black
			txt_selected_color.BackColor = bgColor
			txt_selected_bgcolor.BackColor = color
			logoBmp = Nothing
			selected_logo.Image = Nothing
			pictureBox.Image = Nothing
		End Sub

		Private Shared Sub ShowError(ByVal title As String, ByVal message As String)
			MessageBox.Show($"{title}: {message}", "Error")
		End Sub
	End Class
End Namespace

$vbLabelText $csharpLabel

Step 5: Run Application

When the application is executed, the main window appears as organized with sections for input, styling, output, and actions. Follow the user interface to enter data, customize your QR code, and generate and save the QR code as desired.

Conclusion

In conclusion, this guide has walked you through the process of generating QR codes using the IronQR library in a C# application. By breaking down the steps from setting up your project in Visual Studio, integrating the IronQR library, designing a user-friendly interface, and writing the backend logic, we've demonstrated how accessible it is to add QR code functionality to your applications.

For those interested in exploring the capabilities of IronQR further, it's worth noting that IronQR offers a free trial to get you started. Should you decide to integrate IronQR into your projects, licenses start at $799, providing a cost-effective solution for professional-grade QR code generation.

Preguntas Frecuentes

¿Cómo puedo crear una aplicación generadora de códigos QR en C#?

Para crear una aplicación generadora de códigos QR en C#, puedes usar la biblioteca IronQR. Comienza configurando una aplicación de Windows Forms en Visual Studio, instala IronQR a través de NuGet y diseña el frontend de tu aplicación. Implementa la lógica de generación de códigos QR usando las características de IronQR, como la selección de color y la incorporación de logotipos.

¿Cuáles son los beneficios de usar una biblioteca de códigos QR .NET?

Una biblioteca de códigos QR .NET como IronQR ofrece características avanzadas como alta precisión en la lectura de códigos QR, opciones de personalización para generar códigos QR y soporte para varios entornos .NET. También permite el redimensionamiento y el estilizado de los códigos QR.

¿Cómo manejo los errores al generar códigos QR en C#?

En C#, puedes manejar los errores durante la generación de códigos QR implementando mecanismos de manejo de errores adecuados usando bloques try-catch. IronQR facilita una gestión suave de errores, asegurando que cualquier problema durante la creación de códigos QR se aborde eficientemente.

¿Puedo incorporar logotipos en los códigos QR usando una biblioteca de códigos QR?

Sí, puedes incorporar logotipos en los códigos QR usando la biblioteca IronQR. Esta característica te permite mejorar la imagen de marca de tus códigos QR incorporando logotipos personalizados en el diseño.

¿Cómo guardo los códigos QR generados en una aplicación C#?

Puedes guardar los códigos QR generados en una aplicación C# usando la funcionalidad de IronQR para especificar directorios de almacenamiento. Esto te permite gestionar y almacenar eficientemente los códigos QR generados dentro de tu aplicación.

¿Qué pasos son necesarios para configurar una clave de licencia para una biblioteca de códigos QR?

Para configurar una clave de licencia para IronQR, necesitas incorporar el código de licencia en tu aplicación. Esto generalmente involucra agregar líneas de código específicas proporcionadas por IronQR para activar la biblioteca con tu licencia comprada.

¿Cómo puedo estilizar códigos QR con colores específicos en mi aplicación C#?

IronQR te permite estilizar códigos QR con colores específicos utilizando sus características de personalización de color. Puedes seleccionar colores para el primer plano y el fondo del código QR usando los cuadros de selección de color integrados en tu aplicación.

¿Cuál es el proceso para instalar una biblioteca de códigos QR en Visual Studio?

Para instalar una biblioteca de códigos QR como IronQR en Visual Studio, usa el NuGet Package Manager. Busca 'IronQR' y haz clic en 'Instalar' para añadirlo a tu proyecto. Alternativamente, usa el Package Manager Console con el comando 'Install-Package IronQR'.

Curtis Chau

Chatea con el equipo de ingeniería ahora

Escritor Técnico

Curtis Chau tiene una licenciatura en Ciencias de la Computación (Carleton University) y se especializa en el desarrollo front-end con experiencia en Node.js, TypeScript, JavaScript y React. Apasionado por crear interfaces de usuario intuitivas y estéticamente agradables, disfruta trabajando con frameworks modernos y creando manuales bien ...

¿Listo para empezar?

Nuget Descargas 47,669 | Versión: 2025.11 recién lanzado

Ver Licencias

En esta página

C# QR Code Generator Application

How to Create a QR Code Generator In C#

Install QR Code Generator Library in C#

IronQR: C# QR Library

Some Key Features of IronQR

Read QR Codes

Custom QR Read Mode Options

Read Advanced QR Codes

Step 1: Create a Windows Application in Visual Studio

Step 2: Install IronQR Library

Install using NuGet Package Manager

Install using NuGet Package Manager Console

Step 3: Design Frontend

3.1 Title Header

3.2 Input Section

Text Input for QR Code

Logo Selection

Color Configuration

3.3 Styling Parameters

Dimension Settings

Margin Settings

3.4 Output Preview

3.5 Action Buttons

Generate QR

Save QR Code

Reset Form

Step 4: Write Backend Logic

4.1 Setup and Initialization

4.2 License Key Configuration

4.3 Directory Management

4.4 Color Selection

4.5 Adding Logo

4.6 QR Code Generation

4.7 Saving the QR Code

4.8 Resetting the Application

4.9 Error Handling

4.10 Complete Code Example

Step 5: Run Application

Conclusion

Preguntas Frecuentes

¿Cómo puedo crear una aplicación generadora de códigos QR en C#?

¿Cuáles son los beneficios de usar una biblioteca de códigos QR .NET?

¿Cómo manejo los errores al generar códigos QR en C#?

¿Puedo incorporar logotipos en los códigos QR usando una biblioteca de códigos QR?

¿Cómo guardo los códigos QR generados en una aplicación C#?

¿Qué pasos son necesarios para configurar una clave de licencia para una biblioteca de códigos QR?

¿Cómo puedo estilizar códigos QR con colores específicos en mi aplicación C#?

¿Cuál es el proceso para instalar una biblioteca de códigos QR en Visual Studio?

Próximo paso: Comenzar prueba gratuita de 30 días

Próximo paso: Comenzar prueba gratuita de 30 días

Confiado por más de 2 millones de ingenieros en todo el mundo