chore: 升级示例项目为基于 .NET 6.0 的实现

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/BackgroundServices/TenpayCertificateRefreshingBackgroundService.cs

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+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using SKIT.FlurlHttpClient.Wechat.TenpayV3.Models;
+using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.BackgroundServices
+{
+    class TenpayCertificateRefreshingBackgroundService : BackgroundService
+    {
+        private readonly ILogger _logger;
+        private readonly Options.TenpayOptions _tenpayOptions;
+        private readonly HttpClients.IWechatTenpayHttpClientFactory _tenpayHttpClientFactory;
+
+        public TenpayCertificateRefreshingBackgroundService(
+            ILoggerFactory loggerFactory,
+            IOptions<Options.TenpayOptions> tenpayOptions,
+            HttpClients.IWechatTenpayHttpClientFactory tenpayHttpClientFactory)
+        {
+            _logger = loggerFactory.CreateLogger(GetType());
+            _tenpayOptions = tenpayOptions.Value;
+            _tenpayHttpClientFactory = tenpayHttpClientFactory;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                var wxpayMerchant = _tenpayOptions.Merchants.FirstOrDefault();
+                if (wxpayMerchant == null)
+                {
+                    _logger.LogWarning("未找到微信商户配置项。");
+                    break;
+                }
+
+                try
+                {
+                    var client = _tenpayHttpClientFactory.Create(wxpayMerchant.MerchantId);
+                    var request = new QueryCertificatesRequest();
+                    var response = await client.ExecuteQueryCertificatesAsync(request, cancellationToken: stoppingToken);
+                    if (response.IsSuccessful())
+                    {
+                        // 注意：如果启用了 AutoDecryptResponseSensitiveProperty，则无需再手动执行下面被注释的解密方法
+                        // response = client.DecryptResponseSensitiveProperty(response);
+
+                        foreach (var certificateModel in response.CertificateList)
+                        {
+                            client.CertificateManager.AddEntry(new CertificateEntry(certificateModel));
+                        }
+
+                        _logger.LogInformation("刷新微信商户平台证书成功。");
+                    }
+                    else
+                    {
+                        _logger.LogWarning(
+                            "刷新微信商户平台证书失败（状态码：{0}，错误代码：{1}，错误描述：{2}）。",
+                            response.RawStatus, response.ErrorCode, response.ErrorMessage
+                        );
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "刷新微信商户平台证书遇到异常。");
+                }
+
+                await Task.Delay(TimeSpan.FromDays(1)); // 每隔 1 天轮询刷新
+            }
+        }
+    }
+}