1、通过Nuget安装引用ZXing.Net

1）使用Nuget界面管理器

搜索“ZXing.Net.Bindings.ZKWeb.System.Drawing”,在列表中分别找到它，点击"安装"

相关文档：VS(Visual Studio)中Nuget的使用

2）使用Package Manager命令安装

PM> Install-Package ZXing.Net.Bindings.ZKWeb.System.Drawing

3）使用.NET CLI命令安装

> dotnet add package ZXing.Net.Bindings.ZKWeb.System.Drawing

2、命名空间

using System;
using System.IO;
using System.DrawingCore;
using ZXing.Common;
using ZXing;
using ZXing.QrCode;
using ZXing.ZKWeb;

3、使用ZXing.Net生成条码图片

/// <summary>
///  生成条形码
/// </summary>
/// <param name="message">条码信息</param>
/// <param name="gifFileName">生成条码图片文件名</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
public static void CreateBarCode(string message, string gifFileName, int width, int height)
{
    if (string.IsNullOrWhiteSpace(message))
    {
        return;
    }
    var w = new ZXing.OneD.CodaBarWriter();
    BitMatrix b = w.encode(message, BarcodeFormat.CODE_128, width, height);
    var zzb = new ZXing.ZKWeb.BarcodeWriter();
    zzb.Options = new EncodingOptions()
    {
        Margin = 3,
        PureBarcode = false
    };
    string dir = Path.GetDirectoryName(gifFileName);
    if (!Directory.Exists(dir))
    {
        Directory.CreateDirectory(dir);
    }
    Bitmap b2 = zzb.Write(b);
    b2.Save(gifFileName, ImageFormat.Gif);
    b2.Dispose();
}

4、使用ZXing.Net生成二维码图片

/// <summary>
/// 生成二维码返回byte数组
/// </summary>
/// <param name="message"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public static byte[] CreateCodeBytes(string message, int width = 600, int height = 600)
{
    int heig = width;
    if (width > height)
    {
        heig = height;
        width = height;
    }
    if (string.IsNullOrWhiteSpace(message))
    {
        return null;
    }
    var w = new QRCodeWriter();
    BitMatrix b = w.encode(message, BarcodeFormat.QR_CODE, width, heig);
    var zzb = new BarcodeWriter();
    zzb.Options = new EncodingOptions()
    {
        Margin = 0,
    };
    Bitmap b2 = zzb.Write(b);
    byte[] bytes = BitmapToArray(b2);
    return bytes;
}
//将Bitmap  写为byte[]的方法
public static byte[] BitmapToArray(Bitmap bmp)
{
    byte[] byteArray = null;
    using (MemoryStream stream = new MemoryStream())
    {
        bmp.Save(stream, ImageFormat.Png);
        byteArray = stream.GetBuffer();
    }
    return byteArray;
}