docs: 提供微信商户平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Services/HttpClients/IWechatTenpayHttpClientFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Services.HttpClients
+{
+    public interface IWechatTenpayHttpClientFactory
+    {
+        WechatTenpayClient Create(string appId);
+    }
+}

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Services/HttpClients/Implements/WechatTenpayHttpClientFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+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.WechatOptions _wechatOptions;
+        private readonly CertificateManager _certificateManager;
+
+        public WechatTenpayHttpClientFactory(
+            System.Net.Http.IHttpClientFactory httpClientFactory,
+            IOptions<Options.WechatOptions> wechatOptions,
+            CertificateManager certificateManager)
+        {
+            _httpClientFactory = httpClientFactory;
+            _wechatOptions = wechatOptions.Value;
+            _certificateManager = certificateManager;
+
+            FlurlHttp.GlobalSettings.FlurlClientFactory = new DelegatingFlurlClientFactory(_httpClientFactory);
+        }
+
+        public WechatTenpayClient Create(string merchantId)
+        {
+            var wechatMerchant = _wechatOptions.Merchants?.FirstOrDefault(e => string.Equals(merchantId, e.MerchantId));
+            if (wechatMerchant == 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 = wechatMerchant.MerchantId,
+                MerchantV3Secret = wechatMerchant.SecretV3,
+                MerchantCertSerialNumber = wechatMerchant.CertSerialNumber,
+                MerchantCertPrivateKey = wechatMerchant.CertPrivateKey,
+                CertificateManager = _certificateManager
+            });
+        }
+    }
+
+    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
+            }
+        }
+    }
+}