你应该使用 ZXingBarcodeImageView

使用系统；使用 Xamarin.Forms；使用 System.Threading.Tasks;使用 ZXing.Net.Mobile.Forms；公共类 BarcodePage : ContentPage{ZXingBarcodeImageView条码；公共条码页(){条形码 = 新 ZXingBarcodeImageView {Horizo​​ntalOptions = LayoutOptions.FillAndExpand，VerticalOptions = LayoutOptions.FillAndExpand，AutomationId = "zxingBarcodeImageView",};条形码.BarcodeFormat = ZXing.BarcodeFormat.QR_CODE;条形码.BarcodeOptions.Width = 300;条形码.BarcodeOptions.Height = 300;条形码.BarcodeOptions.Margin = 10;条形码.BarcodeValue = "Hello Stack Overflow";内容 = 条形码；}}

您可以在 Github 中查看完整示例 https://github.com/Redth/ZXing.Net.Mobile/blob/master/Samples/Forms/Core/BarcodePage.cs

I am writing an application in Xamarin to create a QR code for a given input.

using ZXing.Net.Mobile.Forms;

var writer = new BarcodeWriter
        {
            Format = BarcodeFormat.QR_CODE,
            Options = new EncodingOptions
            {
                Height = 200,
                Width = 600
            }
        };
        var bitmap = writer.Write("Hello Stack Overflow");

How do I now display this barcode on my form?

You should use a ZXingBarcodeImageView

using System;
using Xamarin.Forms;
using System.Threading.Tasks;
using ZXing.Net.Mobile.Forms;

public class BarcodePage : ContentPage
{
    ZXingBarcodeImageView barcode;

    public BarcodePage ()
    {
        barcode = new ZXingBarcodeImageView {
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,
            AutomationId = "zxingBarcodeImageView",
        };
        barcode.BarcodeFormat = ZXing.BarcodeFormat.QR_CODE;
        barcode.BarcodeOptions.Width = 300;
        barcode.BarcodeOptions.Height = 300;
        barcode.BarcodeOptions.Margin = 10;
        barcode.BarcodeValue = "Hello Stack Overflow";

        Content = barcode;
    }
}

You can check the full sample in Github https://github.com/Redth/ZXing.Net.Mobile/blob/master/Samples/Forms/Core/BarcodePage.cs