最近做项目需要用到生成二维码,找了一圈找到了这个,收藏起来,
需要安装Ｎuget包：ZXing.Net.Bindings.ZKWeb.System.Drawing

/// <summary>
/// 二维码和条形码
/// </summary>
public class CodeHelper
{
// 生成二维码
public static void CreateCodeEwm(string message, string gifFileName, int width = 600, int height = 600)
{
int heig = width;
if (width > height)
{
heig = height;
width = height;
}
if (string.IsNullOrWhiteSpace(message))
{
return;
}
string dir = Path.GetDirectoryName(gifFileName);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
var w = new ZXing.QrCode.QRCodeWriter();

    BitMatrix b = w.encode(message, BarcodeFormat.QR_CODE, width, heig);
    var zzb = new ZXing.ZKWeb.BarcodeWriter();
    zzb.Options = new EncodingOptions()
    {
        Margin = 0,

    };

    Bitmap b2 = zzb.Write(b);            
    b2.Save(gifFileName, ImageFormat.Gif);
    b2.Dispose();
}

/// <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 ZXing.QrCode.QRCodeWriter();

    BitMatrix b = w.encode(message, BarcodeFormat.QR_CODE, width, heig);
    var zzb = new ZXing.ZKWeb.BarcodeWriter();
    zzb.Options = new EncodingOptions()
    {
        Margin = 0,

    };
    Bitmap b2 = zzb.Write(b);
    byte[] bytes = BitmapToArray(b2);
    return bytes;
}



/// <summary>
/// 读取二维码或者条形码从图片
/// </summary>
/// <param name="imgFile"></param>
/// <returns></returns>
public static string ReadFromImage(string imgFile)
{

    if (string.IsNullOrWhiteSpace(imgFile))
    {
        return "";
    }
    Image img = Image.FromFile(imgFile);
    Bitmap b = new Bitmap(img);

    //该类名称为BarcodeReader,可以读二维码和条形码
    var zzb = new ZXing.ZKWeb.BarcodeReader();
    zzb.Options = new DecodingOptions
    {
        CharacterSet = "UTF-8"
    };
    Result r = zzb.Decode(b);
    string resultText = r.Text;
    b.Dispose();
    img.Dispose();

    return resultText;

}

//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;
}
// 生成条形码
public static void CreateCodeTxm(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.ITF, width, height);
    var zzb = new ZXing.ZKWeb.BarcodeWriter();
    zzb.Options = new EncodingOptions()
    {
        Margin = 3,
        PureBarcode = true
    };
    string dir = Path.GetDirectoryName(gifFileName);
    if (!Directory.Exists(dir))
    {
        Directory.CreateDirectory(dir);
    }
    Bitmap b2 = zzb.Write(b);
    b2.Save(gifFileName, ImageFormat.Gif);
    b2.Dispose();
}

}