C# 和 VB.NET 应用程序中的条形码和二维码

Curtis Chau

已更新:六月 10, 2025

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使用我们的 IronBarcode 软件库，在 C# 和所有其他 .NET 语言中读取和写入条形码非常简单。

安装IronBarcode

旅程的第一步是安装 IronBarcode，可以通过从 NuGet 下载或下载 DLL来完成。

要安装 IronBarcode NuGet 包，您可以使用 Visual Studio 的 NuGet 包管理器：

Install-Package BarCode

或者，您也可以使用 dotnet CLI 进行安装：

dotnet add package IronBarCode

读取条形码或二维码

使用 IronBarcode 读取条形码只需要一行代码。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-1.cs

using IronBarCode;

BarcodeResults results = BarcodeReader.Read("QuickStart.jpg");
if (results != null)
{
    foreach (BarcodeResult result in results)
    {
        Console.WriteLine(result.Text);
    }
}

Imports IronBarCode

Private results As BarcodeResults = BarcodeReader.Read("QuickStart.jpg")
If results IsNot Nothing Then
	For Each result As BarcodeResult In results
		Console.WriteLine(result.Text)
	Next result
End If

$vbLabelText $csharpLabel

只需一行代码，即可高效检测并扫描输入文档中的所有类型条形码——一步到位，满足您的所有需求！此方法支持多种图像格式，例如 JPEG、PNG 和 BMP，以及 PDF 和多帧格式，例如 GIF 和 TIFF。为了提高性能，提供了可自定义的配置选项。

为了提高读取速度，您可以创建一个BarcodeReaderOptions对象，并将Speed设置配置为更好的性能。默认设置为Balanced ，但可以选择Faster选项来跳过某些检查。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-2.cs

using IronBarCode;

BarcodeReaderOptions myOptionsExample = new BarcodeReaderOptions()
{
    ExpectMultipleBarcodes = false,
    ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.Code128,
    CropArea = new System.Drawing.Rectangle(100, 200, 300, 400),
};

BarcodeResults result = BarcodeReader.Read("QuickStart.jpg", myOptionsExample);
if (result != null)
{
    Console.WriteLine(result.First().Text);
}

Imports IronBarCode

Private myOptionsExample As New BarcodeReaderOptions() With {
	.ExpectMultipleBarcodes = False,
	.ExpectBarcodeTypes = BarcodeEncoding.QRCode Or BarcodeEncoding.Code128,
	.CropArea = New System.Drawing.Rectangle(100, 200, 300, 400)
}

Private result As BarcodeResults = BarcodeReader.Read("QuickStart.jpg", myOptionsExample)
If result IsNot Nothing Then
	Console.WriteLine(result.First().Text)
End If

$vbLabelText $csharpLabel

您还可以将ScanMode设置为OnlyBasicScan ，以优化读取过程。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-3.cs

using IronBarCode;

BarcodeResults results = BarcodeReader.Read("MultipleBarcodes.png");

// Loop through the results
foreach (BarcodeResult result in results)
{
    string value = result.Value;
    Bitmap img = result.BarcodeImage;
    BarcodeEncoding barcodeType = result.BarcodeType;
    byte[] binary = result.BinaryValue;
    Console.WriteLine(result.Value);
}

Imports IronBarCode

Private results As BarcodeResults = BarcodeReader.Read("MultipleBarcodes.png")

' Loop through the results
For Each result As BarcodeResult In results
	Dim value As String = result.Value
	Dim img As Bitmap = result.BarcodeImage
	Dim barcodeType As BarcodeEncoding = result.BarcodeType
	Dim binary() As Byte = result.BinaryValue
	Console.WriteLine(result.Value)
Next result

$vbLabelText $csharpLabel

其他配置包括指定要扫描的条形码格式，这可以通过减少不必要的扫描来加快处理速度。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-4.cs

using IronBarCode;

BarcodeResults pagedResults = BarcodeReader.Read("MultipleBarcodes.pdf");

// Loop through the results
foreach (BarcodeResult result in pagedResults)
{
    int pageNumber = result.PageNumber;
    string value = result.Value;
    Bitmap img = result.BarcodeImage;
    BarcodeEncoding barcodeType = result.BarcodeType;
    byte[] binary = result.BinaryValue;
    Console.WriteLine(result.Value);
}

// or from a multi-page  TIFF scan with image correction:
BarcodeResults multiFrameResults = BarcodeReader.Read(inputImage: "Multiframe.tiff", new BarcodeReaderOptions
{
    Speed = ReadingSpeed.Detailed,
    ExpectMultipleBarcodes = true,
    ExpectBarcodeTypes = BarcodeEncoding.Code128,
    Multithreaded = false,
    RemoveFalsePositive = false,
    ImageFilters = null
});

Imports IronBarCode

Private pagedResults As BarcodeResults = BarcodeReader.Read("MultipleBarcodes.pdf")

' Loop through the results
For Each result As BarcodeResult In pagedResults
	Dim pageNumber As Integer = result.PageNumber
	Dim value As String = result.Value
	Dim img As Bitmap = result.BarcodeImage
	Dim barcodeType As BarcodeEncoding = result.BarcodeType
	Dim binary() As Byte = result.BinaryValue
	Console.WriteLine(result.Value)
Next result

' or from a multi-page  TIFF scan with image correction:
Dim multiFrameResults As BarcodeResults = BarcodeReader.Read(inputImage:= "Multiframe.tiff", New BarcodeReaderOptions With {
	.Speed = ReadingSpeed.Detailed,
	.ExpectMultipleBarcodes = True,
	.ExpectBarcodeTypes = BarcodeEncoding.Code128,
	.Multithreaded = False,
	.RemoveFalsePositive = False,
	.ImageFilters = Nothing
})

$vbLabelText $csharpLabel

条形码编写

要使用 IronBarcode 编写条形码，我们使用BarcodeWriter类。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-5.cs

using IronBarCode;

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode", BarcodeEncoding.Code128);
myBarcode.SaveAsImage("myBarcode.png");

Imports IronBarCode

Private myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode", BarcodeEncoding.Code128)
myBarcode.SaveAsImage("myBarcode.png")

$vbLabelText $csharpLabel

条形码样式

IronBarcode 提供了多种选项来操控条形码的视觉呈现。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-7.cs

using IronBarCode;

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode", BarcodeEncoding.Code128);
myBarcode.AddAnnotationTextAboveBarcode("Product URL:");
myBarcode.AddBarcodeValueTextBelowBarcode();
myBarcode.SetMargins(100);
myBarcode.ChangeBarCodeColor(IronSoftware.Drawing.Color.Purple);

// All major image formats supported as well as PDF and HTML
myBarcode.SaveAsPng("myBarcode.png");

Imports IronBarCode

Private myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode", BarcodeEncoding.Code128)
myBarcode.AddAnnotationTextAboveBarcode("Product URL:")
myBarcode.AddBarcodeValueTextBelowBarcode()
myBarcode.SetMargins(100)
myBarcode.ChangeBarCodeColor(IronSoftware.Drawing.Color.Purple)

' All major image formats supported as well as PDF and HTML
myBarcode.SaveAsPng("myBarcode.png")

$vbLabelText $csharpLabel

将条形码导出为 HTML

IronBarcode 可以将条形码导出为 HTML 文档或 HTML 内容的一部分。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-8.cs

using IronBarCode;

QRCodeWriter.CreateQrCode("https://ironsoftware.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium).SaveAsPdf("MyQR.pdf");

Imports IronBarCode

QRCodeWriter.CreateQrCode("https://ironsoftware.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium).SaveAsPdf("MyQR.pdf")

$vbLabelText $csharpLabel

生成二维码

对于二维码，请使用QRCodeWriter类，该类提供了针对二维码特定功能（例如纠错）的额外配置。

:path=/static-assets/barcode/content-code-examples/get-started/get-started-9.cs

using IronBarCode;
using IronSoftware.Drawing;

QRCodeLogo qrCodeLogo = new QRCodeLogo("visual-studio-logo.png");
GeneratedBarcode myQRCodeWithLogo = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/csharp/barcode/", qrCodeLogo);
myQRCodeWithLogo.ChangeBarCodeColor(Color.DarkGreen).SaveAsPdf("MyQRWithLogo.pdf");

Imports IronBarCode
Imports IronSoftware.Drawing

Private qrCodeLogo As New QRCodeLogo("visual-studio-logo.png")
Private myQRCodeWithLogo As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/csharp/barcode/", qrCodeLogo)
myQRCodeWithLogo.ChangeBarCodeColor(Color.DarkGreen).SaveAsPdf("MyQRWithLogo.pdf")

$vbLabelText $csharpLabel

支持的条形码格式

IronBarcode支持多种常用条形码格式的读取和写入：

QR码、微型QR码和矩形微型QR码（rMQR码） 。
其他二维条形码，例如Aztec 、 Data Matrix 、 MaxiCode和PDF417 。
堆叠式线性条形码，例如Databar 。
传统的一维条形码格式，例如UPC-A 、 UPC-E 、 EAN-8 、 EAN-13 、 Codabar 、 ITF 、 MSI和Plessey 。