Как лесно да внедрите QRCoder в ASP.NET Core с помощта на C #

QRCoder е много популярна библиотека за внедряване на QR Code, написана на C #. Той е достъпен в GitHub . Тук ще приложа библиотеката QRCoder за генериране на QR кодове в моето приложение ASP.NET Core. Също така ще използвам C #.

Ще внедря QRCoder по 3 начина, които са:

1. Създайте растрово изображение на QR код за произволен текст.

2. Създайте файл с QR код (.qrr) за всеки текст и след това запазете тези файлове в приложението.

3. Прочетете и покажете всички файлове с QR кодове (.qrr).

Нека започнем с инсталирането на QRCoder в ASP.NET Core Framework.

Можете да изтеглите пълния код от моя GitHub Respositiory .

Инсталация

Инсталирайте QRCoder чрез NuGet Package Manager. Ако искате да използвате NuGet, просто потърсете „QRCoder“ или изпълнете следната команда в конзолата на NuGet Package Manager:

PM> Install-Package QRCoder

QRCoder ще се инсталира за 1 минута и ще бъде готов за употреба.

Сега нека започнем с внедряването на QRCoder по трите начина, споменати по-горе.

Създайте растрово изображение за QR код за всеки текст

Създайте нов контролер, наречен „ QRCoderController“, в папката „Контролери“. Контролерът ще бъде създаден и в него ще има само един метод за действие, наречен „ Index“:

public IActionResult Index() { return View(); }

Импортирайте следните пространства от имена в контролера:

using System; using System.Collections.Generic; using System.Drawing; using System.IO; using Microsoft.AspNetCore.Mvc; using QRCoder;

След това добавете Index Action от тип [HttpPost]към контролера:

[HttpPost] public IActionResult Index(string qrText) { QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); QRCode qrCode = new QRCode(qrCodeData); Bitmap qrCodeImage = qrCode.GetGraphic(20); return View(BitmapToBytes(qrCodeImage)); }
Това действие с индекс получава низ параметър, наречен 'qrText'. Той съдържа текста, предоставен от контрола за въвеждане, дефинирана в изгледа. Този текст ще бъде преобразуван в растрово изображение на QR Code. Следните кодови редове вършат тази работа:
QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); QRCode qrCode = new QRCode(qrCodeData); Bitmap qrCodeImage = qrCode.GetGraphic(20);

Дефинираният обект QRCode (' qrCode') извиква статична функция, наречена ' BitmapToBytes()'. Ролята на тази функция е да преобразува растерното изображение в " Byte[]".

Добавете тази функция към вашия контролер:

private static Byte[] BitmapToBytes(Bitmap img) { using (MemoryStream stream = new MemoryStream()) { img.Save(stream, System.Drawing.Imaging.ImageFormat.Png); return stream.ToArray(); } }

Накрая създайте индексния изглед в Views/QRCoderпапката със следния код:

@model Byte[] @{ Layout = null; }     Implementing QRCoder in ASP.NET Core - Create QR Code  body { background: #111 no-repeat; background-image: -webkit-gradient(radial, 50% 0, 150, 50% 0, 300, from(#444), to(#111)); } h1, h2, h3 { text-align: center; color: #FFF; margin: 5px 0; } h1 { font-size: 30px; } h2 a { font-size: 25px; color: #0184e3; text-decoration: none; } h3 { font-size: 23px; border-bottom: solid 3px #CCC; padding-bottom: 10px; } h3 a { color: #00e8ff; text-decoration: none; } h3 a:hover, h2 a:hover { text-decoration: underline; } .container { width: 800px; margin: auto; color: #FFF; font-size: 25px; } .container #content { border: dashed 2px #CCC; padding: 10px; } #reset { padding: 5px 10px; background: #4CAF50; border: none; color: #FFF; cursor: pointer; } #reset:hover { color: #4CAF50; background: #FFF; } #viewContent table { width: 100%; } #viewContent table tr { height: 80px; background: darkcyan; } #viewContent table tr td { width: 50%; padding-left: 5px; } 

Implementing QRCoder in ASP.NET Core - Create QR Code

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@using (Html.BeginForm(null, null, FormMethod.Post)) {
Enter text for creating QR Code
Submit
} @{ if (Model != null) {

QR Code Successfully Generated

} }

Изгледът на индекса има inputконтрола ' '. Потребителят въвежда своя текст в тази контрола, за да създаде QR кода:

/>

Once the QR Code is generated by the Index Action method, its ‘byte’ array is returned to the View as model and then the bitmap image is displayed by the below code:

@{ if (Model != null) { 

QR Code Successfully Generated

} }

Testing the Code

Run your application and go to the URL — ‘//localhost:50755/QRCoder’ to invoke the Index Action method.

In the text box, add your text and click the submit button to create the QR Code Bitmap image.

See this image which illustrates it working:

Original text


Create QR Code File (.qrr) for any text and then save these files in the application

You can also generate QR Code files for a text and save it in your website. These files have .qrr extension.

To your controller add the following Action methods called ‘GenerateFile’:

public IActionResult GenerateFile() { return View(); } [HttpPost] public IActionResult GenerateFile(string qrText) { QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); string fileGuid = Guid.NewGuid().ToString().Substring(0, 4); qrCodeData.SaveRawData("wwwroot/qrr/file-" + fileGuid + ".qrr", QRCodeData.Compression.Uncompressed); QRCodeData qrCodeData1 = new QRCodeData("wwwroot/qrr/file-" + fileGuid + ".qrr", QRCodeData.Compression.Uncompressed); QRCode qrCode = new QRCode(qrCodeData1); Bitmap qrCodeImage = qrCode.GetGraphic(20); return View(BitmapToBytes(qrCodeImage)); }

The [HttpPost] version of this action method generates the QR Code files inside the ‘wwwroot/qrr’ folder. The code that does this work is the following:

QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); string fileGuid = Guid.NewGuid().ToString().Substring(0, 4); qrCodeData.SaveRawData("wwwroot/qrr/file-" + fileGuid + ".qrr", QRCodeData.Compression.Uncompressed);

Once the .qrr file is created then I am simply reading it for its saved location in the website. Then I am converting it to Bitmap type and finally sending the image’s bytes to the view. The corresponding code is:

QRCodeData qrCodeData1 = new QRCodeData("wwwroot/qrr/file-" + fileGuid + ".qrr", QRCodeData.Compression.Uncompressed); QRCode qrCode = new QRCode(qrCodeData1); Bitmap qrCodeImage = qrCode.GetGraphic(20); return View(BitmapToBytes(qrCodeImage));

Next, add the GenerateFile view inside the ‘Views/QRCoder’ folder and add the following code to it:

@model Byte[] @{ Layout = null; }     Implementing QRCoder in ASP.NET Core - Create QR Code File  body { background: #111 no-repeat; background-image: -webkit-gradient(radial, 50% 0, 150, 50% 0, 300, from(#444), to(#111)); } h1, h2, h3 { text-align: center; color: #FFF; margin: 5px 0; } h1 { font-size: 30px; } h2 a { font-size: 25px; color: #0184e3; text-decoration: none; } h3 { font-size: 23px; border-bottom: solid 3px #CCC; padding-bottom: 10px; } h3 a { color: #00e8ff; text-decoration: none; } h3 a:hover, h2 a:hover { text-decoration: underline; } .container { width: 800px; margin: auto; color: #FFF; font-size: 25px; } .container #content { border: dashed 2px #CCC; padding: 10px; } #reset { padding: 5px 10px; background: #4CAF50; border: none; color: #FFF; cursor: pointer; } #reset:hover { color: #4CAF50; background: #FFF; } #viewContent table { width: 100%; } #viewContent table tr { height: 80px; background: darkcyan; } #viewContent table tr td { width: 50%; padding-left: 5px; } 

Implementing QRCoder in ASP.NET Core - Create QR Code File

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@using (Html.BeginForm(null, null, FormMethod.Post)) {
Enter text for creating QR File
Submit
} @{ if (Model != null) {

QR Code file Successfully Generated

} }

The code of this View is exactly similar to the ‘Index’ View and works exactly like it.

The URL to invoke this View is ‘//localhost:50755/QRCoder/GenerateFile’.

Read and display all the QR Code Files (.qrr)

You can also read all the .qrr files saved in the website. Go to your controller and add a new action called ‘ViewFile’:

public IActionResult ViewFile() { List fileData=new List(); KeyValuePair data; string[] files = Directory.GetFiles("wwwroot/qrr"); foreach (string file in files) { QRCodeData qrCodeData = new QRCodeData(file, QRCodeData.Compression.Uncompressed); QRCode qrCode = new QRCode(qrCodeData); Bitmap qrCodeImage = qrCode.GetGraphic(20); Byte[] byteData = BitmapToBytes(qrCodeImage); data = new KeyValuePair(Path.GetFileName(file), byteData); fileData.Add(data); } return View(fileData); }

In this action method, I read the filed located in the ‘qrr’ folder using the code:

Directory.GetFiles("wwwroot/qrr")

Then I add each qrr file’s bytes and name inside a List object.

This object is returned to the View at the end:

return View(fileData);

Finally create the ‘ViewFile’ View inside the ‘Views/QRCoder’ folder with the following code:

@model List  @{ Layout = null; }     Implementing QRCoder in ASP.NET Core - View QR Code Files  body { background: #111 no-repeat; background-image: -webkit-gradient(radial, 50% 0, 150, 50% 0, 300, from(#444), to(#111)); } h1, h2, h3 { text-align: center; color: #FFF; margin: 5px 0; } h1 { font-size: 30px; } h2 a { font-size: 25px; color: #0184e3; text-decoration: none; } h3 { font-size: 23px; border-bottom: solid 3px #CCC; padding-bottom: 10px; } h3 a { color: #00e8ff; text-decoration: none; } h3 a:hover, h2 a:hover { text-decoration: underline; } .container { width: 800px; margin: auto; color: #FFF; font-size: 25px; } .container #content { border: dashed 2px #CCC; padding: 10px; } #reset { padding: 5px 10px; background: #4CAF50; border: none; color: #FFF; cursor: pointer; } #reset:hover { color: #4CAF50; background: #FFF; } #viewContent table { width: 100%; } #viewContent table tr { height: 80px; background: darkcyan; } #viewContent table tr td { width: 50%; padding-left: 5px; } #viewContent table tr td img { width: 150px; } #viewContent table tr td span { display: block; } 

Implementing QRCoder in ASP.NET Core - View QR Code Files

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@foreach (KeyValuePair k in Model) { }
@k.Key

This View displays all the qrr files as bitmap images inside a ‘HTML’ table. The below code creates the HTML table:

 @foreach (KeyValuePair k in Model) {  } 
@k.Key

Testing the Code

Run your application and go to the URL — ‘//localhost:50755/QRCoder/ViewFile’ to invoke the ViewFile Action method. You will see all the .qrr files saved in your website.

See the below image which illustrates it working:

You can download the full code from my GitHub Respositiory.

Conclusion

I hope you love this repository which will help you to use QRCoder in your ASP.NET Core Project. Make sure you like this repository to show your love to it.

If you need any help in ASP.NET Core then let me know in the below comments section.

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Thanks and Happy Coding!