services.AddScoped<WeixinEventSink>();
var weixinEventSink = services.BuildServiceProvider().GetRequiredService<WeixinEventSink>();
services.AddWeixinWelcomePage(options =>
  {
      options.AppId = _configuration["Weixin:AppId"];
      options.AppSecret = _configuration["Weixin:AppSecret"];
      options.WebsiteToken = _configuration["Weixin:WebsiteToken"];
      
      options.EncodingAESKey = _configuration["Weixin:EncodingAESKey"]; //请注意检查该值正确无误！
      // （1）若填写错误，将导致您在启用“兼容模式”或“安全模式”时无法正确解密（及加密）；
      // （2）若您使用“微信公众平台测试号”部署，您应当注意到其不支持消息加解密，此时须用空字符串或不配置。
      
      options.Path = "/wx"; //默认值
      options.Debug = false; //默认值，不允许微信web开发者工具(wechatdevtools)等客户端访问。若修改为true则允许。
      
      options.Events = new WeixinMessageEvents()
      {
          OnTextMessageReceived = ctx => weixinEventSink.OnTextMessageReceived(ctx.Sender, ctx.Args),
          OnLinkMessageReceived = ctx => weixinEventSink.OnLinkMessageReceived(ctx.Sender, ctx.Args),
          OnClickMenuEventReceived = ctx => weixinEventSink.OnClickMenuEventReceived(ctx.Sender, ctx.Args),
          OnImageMessageReceived = ctx => weixinEventSink.OnImageMessageReceived(ctx.Sender, ctx.Args),
          OnLocationEventReceived = ctx => weixinEventSink.OnLocationEventReceived(ctx.Sender, ctx.Args),
          OnLocationMessageReceived = ctx => weixinEventSink.OnLocationMessageReceived(ctx.Sender, ctx.Args),
          OnQrscanEventReceived = ctx => weixinEventSink.OnQrscanEventReceived(ctx.Sender, ctx.Args),
          OnEnterEventReceived = ctx => weixinEventSink.OnEnterEventReceived(ctx.Sender, ctx.Args),
          OnSubscribeEventReceived = ctx => weixinEventSink.OnSubscribeEventReceived(ctx.Sender, ctx.Args),
          OnUnsubscribeEventReceived = ctx => weixinEventSink.OnUnsubscribeEventReceived(ctx.Sender, ctx.Args),
          OnVideoMessageReceived = ctx => weixinEventSink.OnVideoMessageReceived(ctx.Sender, ctx.Args),
          OnShortVideoMessageReceived = ctx => weixinEventSink.OnShortVideoMessageReceived(ctx.Sender, ctx.Args),
          OnViewMenuEventReceived = ctx => weixinEventSink.OnViewMenuEventReceived(ctx.Sender, ctx.Args),
          OnVoiceMessageReceived = ctx => weixinEventSink.OnVoiceMessageReceived(ctx.Sender, ctx.Args)
      };
  });

app.UseWeixinWelcomePage();

services.AddWeixinAccessToken(options => 
  {
      options.AppId = _configuration["Weixin:AppId"];
      options.AppSecret = _configuration["Weixin:AppSecret"];
  });

private readonly IWeixinAccessToken _weixinAccessToken;

.ctor(IWeixinAccessToken weixinAccessToken)
{
    _weixinAccessToken = weixinAccessToken;
}

public IActionResult MethodA()
{
   var token = _weixinAccessToken.GetToken();
}

services.AddWeixinJssdk(options =>
{
      options.AppId = _configuration["Weixin:AppId"];
});

private readonly IWeixinJsapiTicket _weixinJsapiTicket;
private readonly WeixinJssdkOptions _weixinJssdkOptions;

public IActionResult Index()
{
	var weixinJsConfig = new WeixinJsConfig()
	{
		debug = false,
		appId = _weixinJssdkOptions.AppId
	};

	var jsapiTicket = _weixinJsapiTicket.GetTicket();
	var refererUrl = Request.GetAbsoluteUri();
	var vm = new ShareJweixinViewModel
	{
		WeixinJsConfigJson = weixinJsConfig.ToJson(jsapiTicket, refererUrl),
		Title = "xxx",
		Url = Url.AbsoluteAction(...),
		Description = "yyy",
		ImgUrl = "https://...."
	};

	return View(vm);
}

<script src="//res.wx.qq.com/open/js/jweixin-1.4.0.js" asp-append-version="true"></script>

@model ShareJweixinViewModel

//...

<script type="text/javascript">
$(document).ready(function () {
	wx.config(@Html.Raw(Model.WeixinJsConfigJson);
	wx.ready(function(){
		wx.onMenuShareAppMessage({
			title: '@Html.Raw(Model.Title)', // 分享标题
			desc: '@Html.Raw(Model.Description)', // 分享描述
			link: '@Html.Raw(Model.Url)', // 分享链接
			imgUrl: '@Html.Raw(Model.ImgUrl)', // 分享图标
			type: '', // 分享类型,music、video或link，不填默认为link
			dataUrl: '', // 如果type是music或video，则要提供数据链接，默认为空
			success: function () {
					// 用户确认分享后执行的回调函数
					toastSuccess("分享成功");
			},
			cancel: function () {
					// 用户取消分享后执行的回调函数
					toastWarning("已取消分享");
			}
		});
	});
</script>