Hogyan lehet egyszerűen megvalósítani a QRCodert az ASP.NET Core-ban a C # használatával

A QRCoder egy nagyon népszerű QR Code implementációs könyvtár, amely C # nyelven íródott. Ez elérhető a GitHub-ban . Itt fogom megvalósítani a QRCoder könyvtárat, hogy QR-kódokat hozzak létre az ASP.NET Core alkalmazásomban. C # -t is fogok használni.

A QRCodert háromféle módon valósítom meg, amelyek a következők:

1. Hozzon létre QR Code Bitmap képet bármilyen szöveghez.

2. Hozzon létre QR-kódfájlt (.qrr) minden szöveghez, majd mentse ezeket a fájlokat az alkalmazásba.

3. Olvassa el és jelenítse meg az összes QR-kódfájlt (.qrr).

Kezdjük a QRCoder telepítésével az ASP.NET Core keretrendszerben.

A teljes kódot letöltheti a GitHub Respositiory oldalamról .

Telepítés

Telepítse a QRCodert a NuGet Package Manager segítségével. A NuGet használatához keressen rá a „QRCoder” kifejezésre, vagy futtassa a következő parancsot a NuGet Package Manager konzolon:

PM> Install-Package QRCoder

A QRCoder 1 perc múlva települ, és használatra kész.

Most kezdjük a QRCoder megvalósításával a fent említett 3 módon.

Hozzon létre QR Code Bitmap képet bármilyen szöveghez

Hozzon létre egy új „ QRCoderController” nevű vezérlőt a Vezérlők mappában. A vezérlő létrejön, és csak egy " Index" nevű műveleti módszer lesz benne:

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

Importálja a következő névtereket a vezérlőbe:

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

Ezután adja hozzá a típusú Index műveletet [HttpPost]a vezérlőhöz:

[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)); }
Ez az indexművelet egy 'qrText' nevű karakterlánc-paramétert kap. A nézetben definiált bemeneti vezérlő által biztosított szöveget tartalmazza. Ezt a szöveget QR Code Bitmap képpé alakítja át. A következő kódsorok végzik ezt a munkát:
QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); QRCode qrCode = new QRCode(qrCodeData); Bitmap qrCodeImage = qrCode.GetGraphic(20);

A qrCodedefiniált QRCode objektum (' ') egy ' BitmapToBytes()' nevű statikus függvényt hív meg . Ennek a funkciónak az a szerepe, hogy a Bitmap képet konvertálja " Byte[]" -ra.

Adja hozzá ezt a funkciót a vezérlőhöz:

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

Végül hozza létre az Index nézetet a ' Views/QRCoder' mappában a következő kóddal:

@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

} }

Az Index nézet ' input' vezérlővel rendelkezik. A felhasználó ebbe a vezérlőbe írja be a szövegét a QR-kód létrehozásához:

/>

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:

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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