chore: 升级示例项目为基于 .NET 6.0 的实现

samples/SKIT.FlurlHttpClient.Wechat.Api.Sample_Net6/Services/HttpClients/IWechatApiHttpClientFactory.cs

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

samples/SKIT.FlurlHttpClient.Wechat.Api.Sample_Net6/Services/HttpClients/Implements/WechatApiHttpClientFactory.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.Api.Sample_Net5.Services.HttpClients.Implements
+{
+    partial class WechatApiHttpClientFactory : IWechatApiHttpClientFactory
+    {
+        private readonly System.Net.Http.IHttpClientFactory _httpClientFactory;
+        private readonly Options.WechatOptions _wechatOptions;
+
+        public WechatApiHttpClientFactory(
+            System.Net.Http.IHttpClientFactory httpClientFactory,
+            IOptions<Options.WechatOptions> wechatOptions)
+        {
+            _httpClientFactory = httpClientFactory;
+            _wechatOptions = wechatOptions.Value;
+
+            FlurlHttp.GlobalSettings.FlurlClientFactory = new DelegatingFlurlClientFactory(_httpClientFactory);
+        }
+
+        public WechatApiClient Create(string appId)
+        {
+            var wechatAccountOptions = _wechatOptions.Accounts?.FirstOrDefault(e => string.Equals(appId, e.AppId));
+            if (wechatAccountOptions == null)
+                throw new Exception("未在配置项中找到该 AppId 对应的微信账号。");
+
+            return new WechatApiClient(new WechatApiClientOptions()
+            {
+                AppId = wechatAccountOptions.AppId,
+                AppSecret = wechatAccountOptions.AppSecret
+            });
+        }
+    }
+
+    partial class WechatApiHttpClientFactory
+    {
+        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
+            }
+        }
+    }
+}