chore: 升级示例项目为基于 .NET 6.0 的实现

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/HttpClients/IWechatTenpayCertificateManagerFactory.cs

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+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.HttpClients
+{
+    using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
+
+    public interface IWechatTenpayCertificateManagerFactory
+    {
+        CertificateManager Create(string merchantId);
+    }
+}

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/HttpClients/IWechatTenpayHttpClientFactory.cs

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+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.HttpClients
+{
+    public interface IWechatTenpayHttpClientFactory
+    {
+        WechatTenpayClient Create(string merchantId);
+    }
+}

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/HttpClients/Implements/WechatTenpayCertificateManagerFactory.cs

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+using System.Collections.Concurrent;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.HttpClients.Implements
+{
+    using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
+
+    partial class WechatTenpayCertificateManagerFactory : IWechatTenpayCertificateManagerFactory
+    {
+        private readonly ConcurrentDictionary<string, CertificateManager> _dict;
+
+        public WechatTenpayCertificateManagerFactory()
+        {
+            _dict = new ConcurrentDictionary<string, CertificateManager>();
+        }
+
+        public CertificateManager Create(string merchantId)
+        {
+            // 注意：这里的工厂方法是为了演示多租户而存在的；如果你的项目只存在唯一一个租户，那么直接注入 `CertificateManager` 就可以
+
+            return _dict.GetOrAdd(merchantId, new InMemoryCertificateManager());
+        }
+    }
+}

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/HttpClients/Implements/WechatTenpayHttpClientFactory.cs

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+using System;
+using System.Linq;
+using Flurl;
+using Flurl.Http;
+using Flurl.Http.Configuration;
+using Microsoft.Extensions.Options;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.HttpClients.Implements
+{
+    using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
+
+    partial class WechatTenpayHttpClientFactory : IWechatTenpayHttpClientFactory
+    {
+        private readonly System.Net.Http.IHttpClientFactory _httpClientFactory;
+        private readonly Options.TenpayOptions _tenpayOptions;
+        private readonly IWechatTenpayCertificateManagerFactory _tenpayCertificateManagerFactory;
+
+        public WechatTenpayHttpClientFactory(
+            System.Net.Http.IHttpClientFactory httpClientFactory,
+            IOptions<Options.TenpayOptions> tenpayOptions,
+            IWechatTenpayCertificateManagerFactory tenpayCertificateManagerFactory)
+        {
+            _httpClientFactory = httpClientFactory;
+            _tenpayOptions = tenpayOptions.Value;
+            _tenpayCertificateManagerFactory = tenpayCertificateManagerFactory;
+
+            FlurlHttp.GlobalSettings.FlurlClientFactory = new DelegatingFlurlClientFactory(_httpClientFactory);
+        }
+
+        public WechatTenpayClient Create(string merchantId)
+        {
+            // 注意：这里的工厂方法是为了演示多租户而存在的；如果你的项目只存在唯一一个租户，那么直接注入 `WechatTenpayClient` 就可以
+
+            var tenpayMerchantOptions = _tenpayOptions.Merchants?.FirstOrDefault(e => string.Equals(merchantId, e.MerchantId));
+            if (tenpayMerchantOptions == null)
+                throw new Exception("未在配置项中找到该 MerchantId 对应的微信商户号。");
+
+            return new WechatTenpayClient(new WechatTenpayClientOptions()
+            {
+                MerchantId = tenpayMerchantOptions.MerchantId,
+                MerchantV3Secret = tenpayMerchantOptions.SecretV3,
+                MerchantCertSerialNumber = tenpayMerchantOptions.CertSerialNumber,
+                MerchantCertPrivateKey = tenpayMerchantOptions.CertPrivateKey,
+                CertificateManager = _tenpayCertificateManagerFactory.Create(tenpayMerchantOptions.MerchantId),
+                AutoEncryptRequestSensitiveProperty = true,
+                AutoDecryptResponseSensitiveProperty = true
+            });
+        }
+    }
+
+    partial class WechatTenpayHttpClientFactory
+    {
+        internal class DelegatingFlurlClientFactory : IFlurlClientFactory
+        {
+            private readonly System.Net.Http.IHttpClientFactory _httpClientFactory;
+
+            public DelegatingFlurlClientFactory(System.Net.Http.IHttpClientFactory httpClientFactory)
+            {
+                _httpClientFactory = httpClientFactory ?? throw new ArgumentNullException(nameof(httpClientFactory));
+            }
+
+            public IFlurlClient Get(Url url)
+            {
+                return new FlurlClient(_httpClientFactory.CreateClient(url.ToUri().Host));
+            }
+
+            public void Dispose()
+            {
+                // Do Nothing
+            }
+        }
+    }
+}