c# 生成二維碼的示例

更新時間：2020年11月17日 09:43:02 作者：UP技術(shù)控

這篇文章主要介紹了c# 生成二維碼的示例，幫助大家更好的理解和使用c#編程語言，感興趣的朋友可以了解下

二維碼是越來越流行了，很多地方都有可能是使用到。如果是靜態(tài)的二維碼還是比較好處理的，通過在線工具就可以直接生成一張二維碼圖片，比如：草料二維碼。但有的時候是需要動態(tài)生成的（根據(jù)動態(tài)數(shù)據(jù)生成），這個使用在線就工具就無法實現(xiàn)了。最好是能在代碼中直接生成一個二維碼圖片，這里我就介紹下使用QRCoder類庫在代碼中生成二維碼。

網(wǎng)上生成二維碼的組件還是挺多的，但是真正好用且快速的卻不多。QRCoder就是我在眾多中找到的，它的生成速度快、而且使用也相當方便。

開始編碼

1、安裝 QRCoder組件。在項目上通過NuGet包管理器來安裝，搜索名稱：QRCoder

2、在代碼中添加引用：using QRCoder;

3、編碼生成

 private void RenderQrCode()
    {
      string level = comboBoxECC.SelectedItem.ToString();
      QRCodeGenerator.ECCLevel eccLevel = (QRCodeGenerator.ECCLevel)(level == "L" ? 0 : level == "M" ? 1 : level == "Q" ? 2 : 3);
      using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
      {
        using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(textBoxQRCode.Text, eccLevel))
        {
          using (QRCode qrCode = new QRCode(qrCodeData))
          {


            pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20, Color.Black, Color.White,
              GetIconBitmap(), (int) iconSize.Value);


             this.pictureBoxQRCode.Size = new System.Drawing.Size(pictureBoxQRCode.Width, pictureBoxQRCode.Height);
            //Set the SizeMode to center the image.
            this.pictureBoxQRCode.SizeMode = PictureBoxSizeMode.CenterImage;


            pictureBoxQRCode.SizeMode = PictureBoxSizeMode.StretchImage;
          }
        }
      }
    }

上面代碼運行的結(jié)果

還可以加上logo

 private Bitmap GetIconBitmap()
    {
      Bitmap img = null;
      if (iconPath.Text.Length > 0)
      {
        try
        {
          img = new Bitmap(iconPath.Text);
        }
        catch (Exception)
        {
        }
      }
      return img;
    }

完整代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using QRCoder;
using System.Drawing.Imaging;
using System.IO;


namespace QRCoderDemo
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }


    private void Form1_Load(object sender, EventArgs e)
    {
      comboBoxECC.SelectedIndex = 0; //Pre-select ECC level "L"
      RenderQrCode();
    }


    private void buttonGenerate_Click(object sender, EventArgs e)
    {
      RenderQrCode();
    }


    private void RenderQrCode()
    {
      string level = comboBoxECC.SelectedItem.ToString();
      QRCodeGenerator.ECCLevel eccLevel = (QRCodeGenerator.ECCLevel)(level == "L" ? 0 : level == "M" ? 1 : level == "Q" ? 2 : 3);
      using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
      {
        using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(textBoxQRCode.Text, eccLevel))
        {
          using (QRCode qrCode = new QRCode(qrCodeData))
          {


            pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20, Color.Black, Color.White,
              GetIconBitmap(), (int) iconSize.Value);


             this.pictureBoxQRCode.Size = new System.Drawing.Size(pictureBoxQRCode.Width, pictureBoxQRCode.Height);
            //Set the SizeMode to center the image.
            this.pictureBoxQRCode.SizeMode = PictureBoxSizeMode.CenterImage;


            pictureBoxQRCode.SizeMode = PictureBoxSizeMode.StretchImage;
          }
        }
      }
    }


    private Bitmap GetIconBitmap()
    {
      Bitmap img = null;
      if (iconPath.Text.Length > 0)
      {
        try
        {
          img = new Bitmap(iconPath.Text);
        }
        catch (Exception)
        {
        }
      }
      return img;
    }


    private void selectIconBtn_Click(object sender, EventArgs e)
    {
      OpenFileDialog openFileDlg = new OpenFileDialog();
      openFileDlg.Title = "Select icon";
      openFileDlg.Multiselect = false;
      openFileDlg.CheckFileExists = true;
      if (openFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
      {
        iconPath.Text = openFileDlg.FileName;
        if (iconSize.Value == 0)
        {
          iconSize.Value = 15;
        }
      }
      else
      {
        iconPath.Text = "";
      }
    }




    private void btn_save_Click(object sender, EventArgs e)
    {


      // Displays a SaveFileDialog so the user can save the Image
      SaveFileDialog saveFileDialog1 = new SaveFileDialog();
      saveFileDialog1.Filter = "Bitmap Image|*.bmp|PNG Image|*.png|JPeg Image|*.jpg|Gif Image|*.gif";
      saveFileDialog1.Title = "Save an Image File";
      saveFileDialog1.ShowDialog();


      // If the file name is not an empty string open it for saving.
      if (saveFileDialog1.FileName != "")
      {
        // Saves the Image via a FileStream created by the OpenFile method.
        using (FileStream fs = (System.IO.FileStream) saveFileDialog1.OpenFile())
        {
          // Saves the Image in the appropriate ImageFormat based upon the
          // File type selected in the dialog box.
          // NOTE that the FilterIndex property is one-based.


          ImageFormat imageFormat = null;
          switch (saveFileDialog1.FilterIndex)
          {
            case 1:
              imageFormat = ImageFormat.Bmp;
              break;
            case 2:
              imageFormat = ImageFormat.Png;
              break;
            case 3:
              imageFormat = ImageFormat.Jpeg;
              break;
            case 4:
              imageFormat = ImageFormat.Gif;
              break;
            default:
              throw new NotSupportedException("File extension is not supported");
          }


          pictureBoxQRCode.BackgroundImage.Save(fs, imageFormat);
          fs.Close();
        }
      }










    }


    public void ExportToBmp(string path)
    {


    }


    private void textBoxQRCode_TextChanged(object sender, EventArgs e)
    {
      RenderQrCode();
    }


    private void comboBoxECC_SelectedIndexChanged(object sender, EventArgs e)
    {
      RenderQrCode();
    }
  }
}

以上就是c# 生成二維碼的示例的詳細內(nèi)容，更多關(guān)于c# 生成二維碼的資料請關(guān)注腳本之家其它相關(guān)文章！

您可能感興趣的文章: