Where does QrWriter live in the IronQR API?

QrWriter is a class in the IronQr namespace, shipped in IronQr.dll. Its members are static Write overloads, so call QrWriter.Write directly without constructing an instance.

How do you generate a QR code in C#?

Call the static QrWriter.Write with a string, byte array, or stream to get a QrCode, then call Save on it to write an image. Pass a QrStyleOptions to Save to control size, color, and logo.

How do you set the encoding or error correction of a generated QR code?

Pass a QrOptions to the Write overload, setting QrEncoding, QrErrorCorrectionLevel, version, and character encoding. Without it, QrWriter uses defaults for a standard QRCode.

Class QrWriter

Provides functionality to write QR codes.

Inheritance

System.Object

QrWriter

Namespace: IronQr

Assembly: IronQr.dll

Syntax

public class QrWriter : Object

QrWriter generates QR codes from text, bytes, or a stream in C#. Every member is a static Write overload, so there is nothing to construct: call QrWriter.Write(...) and a QrCode comes back, ready to save as an image, stamp onto a PDF, or export as a data URL.

The overloads cover the common inputs. Write(string) encodes text or a URL, Write(byte[]) encodes raw bytes, and Write(Stream) encodes a stream's contents. Each has a second form that also takes a QrOptions, which sets the QrEncoding, the QrErrorCorrectionLevel, the version, and the character encoding. Without options, the writer picks sensible defaults for a standard QRCode.

Encoding a byte[] or Stream suits a binary payload such as a serialized token or a small file, while Write(string) covers the common URL and text cases. Because every overload returns the same QrCode, the choice of output, an image, a PDF stamp, a data URL, or an HTML tag, is made afterward and is independent of how the code was encoded.

The result is a QrCode. From there, Save writes an image and accepts a QrStyleOptions to control size, color, margins, and an embedded logo, while StampToExistingPdfPage and StampToExistingPdfPages place the code onto a PDF, and ToDataUrl and ToHtmlTag produce web-ready output. Raise the error-correction level when the code must survive print wear or a logo overlay.

using IronQr;

QrCode qr = QrWriter.Write("https://ironsoftware.com");
qr.Save("qr.png");

The generate QR code example writes a basic code, the styled QR example applies styling, and the QR writing tutorial covers the options.

Constructors

QrWriter()

Declaration

public QrWriter()

Methods

Write(Byte[])

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(byte[] binaryData)

Parameters

Type	Name	Description
System.Byte[]	binaryData	The value of the QR code as a byte array.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.

Write(Byte[], QrOptions)

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(byte[] binaryData, QrOptions options)

Parameters

Type	Name	Description
System.Byte[]	binaryData	The value of the QR code as a byte array.
QrOptions	options	The options for customizing the QR code, including error correction level and version.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.

Write(Stream)

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(Stream binaryDataStream)

Parameters

Type	Name	Description
System.IO.Stream	binaryDataStream	The value of the QR code as a stream.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.

Write(Stream, QrOptions)

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(Stream binaryDataStream, QrOptions options)

Parameters

Type	Name	Description
System.IO.Stream	binaryDataStream	The value of the QR code as a stream.
QrOptions	options	The options for customizing the QR code, including error correction level and version.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.

Write(String)

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(string value)

Parameters

Type	Name	Description
System.String	value	The value of the QR code as a string. Also suitable for URLS.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.

Write(String, QrOptions)

Renders a QR code from a String of data. UTF-8 fully supported.

Declaration

public static QrCode Write(string value, QrOptions options)

Parameters

Type	Name	Description
System.String	value	The value of the QR code as a string. Also suitable for URLS.
QrOptions	options	The options for customizing the QR code, including error correction level and version.

Returns

Type	Description
QrCode	A QrCode object for the QR code which can be manipulated, annotated and saved to a IronSoftware.Drawing.AnyBitmap, an object, image file, PDF, MediaURL or data stream.