chore(tenpayv3): 新增基于 .NET Framework 4.7 的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_NetFramework47/Options/TenpayOptions.cs

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+using System;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Web.Configuration;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample.Options
+{
+    public partial class TenpayOptions
+    {
+        public static readonly Lazy<TenpayOptions> Instance = new Lazy<TenpayOptions>(() =>
+        {
+            var configMerchantRegex = new Regex("^TenpayOptions_Merchant_(\\d+)_MerchantId$");
+            var configMerchantIndexes = WebConfigurationManager.AppSettings.AllKeys
+                .Where(key => configMerchantRegex.IsMatch(key))
+                .Select(key => configMerchantRegex.Matches(key)[0].Groups[1].Value)
+                .ToArray();
+
+            return new TenpayOptions()
+            {
+                Merchants = configMerchantIndexes
+                    .Select(i => new Types.WechatMerchant()
+                    {
+                        MerchantId = WebConfigurationManager.AppSettings[$"TenpayOptions_Merchant_{i}_MerchantId"],
+                        SecretV3 = WebConfigurationManager.AppSettings[$"TenpayOptions_Merchant_{i}_SecretV3"],
+                        CertSerialNumber = WebConfigurationManager.AppSettings[$"TenpayOptions_Merchant_{i}_CertSerialNumber"],
+                        CertPrivateKey = WebConfigurationManager.AppSettings[$"TenpayOptions_Merchant_{i}_CertPrivateKey"],
+                    })
+                    .ToArray(),
+                NotifyUrl = WebConfigurationManager.AppSettings[$"TenpayOptions_NotifyUrl"]
+            };
+        }, isThreadSafe: true);
+    }
+
+    partial class TenpayOptions
+    {
+        public Types.WechatMerchant[] Merchants { get; set; } = Array.Empty<Types.WechatMerchant>();
+
+        public string NotifyUrl { get; set; } = string.Empty;
+    }
+
+    partial class TenpayOptions
+    {
+        public static class Types
+        {
+            public class WechatMerchant
+            {
+                public string MerchantId { get; set; } = string.Empty;
+
+                public string SecretV3 { get; set; } = string.Empty;
+
+                public string CertSerialNumber { get; set; } = string.Empty;
+
+                public string CertPrivateKey { get; set; } = string.Empty;
+            }
+        }
+    }
+}