【C#】QRコードを作成するならコレ！ZXing.NETの使い方

using ZXing;
using ZXing.QrCode;
using ZXing.QrCode.Internal;
using System.Drawing.Imaging;
using System.IO;

private BitmapFrame QRcodeCreate(string code)
{
    var qrCode = new BarcodeWriter
    {
        // バーコードの種類を選択
        Format = BarcodeFormat.QR_CODE,
        // QRコードのオプション設定
        Options = new QrCodeEncodingOptions
        {
            QrVersion = 5,
            ErrorCorrection = ErrorCorrectionLevel.M,
            CharacterSet = "UTF-8",
            Width = 200,
            Height = 200,
            Margin = 5,
        },
    };

    //QRコード生成
    BitmapFrame qrbmp;
    using (var bmp = qrCode.Write(code))
    using (var ms = new MemoryStream())
    {
        bmp.Save(ms, ImageFormat.Bmp);
        qrbmp = BitmapFrame.Create(ms, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
    }

    return qrbmp;
}

<Window
    x:Class="ZXingSample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:ZXingSample"
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="400"
    Height="450"
    WindowStyle="None"
    mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <!--  ヘッダー  -->
        <materialDesign:ColorZone
            Grid.Row="0"
            Height="50"
            Padding="12"
            Mode="PrimaryMid">
            <DockPanel>
                <materialDesign:PopupBox DockPanel.Dock="Right" PlacementMode="BottomAndAlignRightEdges">
                    <ListBox>
                        <ListBoxItem Content="Close" />
                    </ListBox>
                </materialDesign:PopupBox>
                <StackPanel Orientation="Horizontal">
                    <materialDesign:PackIcon
                        Width="26"
                        Height="26"
                        Kind="Qrcode" />
                    <TextBlock
                        Margin="16,0,0,0"
                        VerticalAlignment="Center"
                        Text="QRcode SAMPLE" />
                </StackPanel>
            </DockPanel>
        </materialDesign:ColorZone>
        <Label
            x:Name="lblQrcode"
            Grid.Row="1"
            Margin="15,20,0,0"
            HorizontalAlignment="Left"
            VerticalAlignment="Top"
            Content="入力文字列：" />
        <TextBox
            x:Name="txtQrcode"
            Grid.Row="1"
            Margin="100,8,115,0"
            VerticalAlignment="Top"
            materialDesign:HintAssist.Hint="文字列を入力してください。"
            Style="{StaticResource MaterialDesignFloatingHintTextBox}" />
        <Button
            Name="btnCreate"
            Grid.Row="1"
            Margin="0,0,10,0"
            HorizontalAlignment="Right"
            VerticalAlignment="Center"
            Click="btnCreate_Click"
            Content="QRコード生成"
            FontSize="12" />
        <Image
            x:Name="ImgQrcode"
            Grid.Row="2"
            Margin="10"
            HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch" />
    </Grid>
</Window>

namespace ZXingSample
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnCreate_Click(object sender, RoutedEventArgs e)
        {
            //QRコード画像をイメージコントロールへ反映
            ImgQrcode.Source = QRcodeCreate(txtQrcode.Text);
        }
    }
}