ZXing.Net

官网： https://github.com/micjahn/ZXing.Net

NuGet安装：

Install-Package ZXing.Net

示例代码：

// create a barcode reader instance
IBarcodeReader reader = new BarcodeReader();
// load a bitmap
var barcodeBitmap = (Bitmap)Image.LoadFrom("C:\\sample-barcode-image.png");
// detect and decode the barcode inside the bitmap
var result = reader.Decode(barcodeBitmap);
// do something with the result
if (result != null)
{
   txtDecoderType.Text = result.BarcodeFormat.ToString();
   txtDecoderContent.Text = result.Text;
}

参考资料

• C# 二维码扫描 - 天上星 - 博客园