QRCoder帮助类，net6.0

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFramework>net6.0</TargetFramework> </PropertyGroup> <ItemGroup> <PackageReference Include="iTextSharp.LGPLv2.Core" Version="1.7.5" /> <PackageReference Include="JWT" Version="8.9.0" /> <PackageReference Include="log4net" Version="2.0.14" /> <PackageReference Include="Microsoft.Extensions.Configuration" Version="6.0.0" /> <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Versio