refactor: 重构代码提高可读性

Author: ArgoZhang

src/BootstrapBlazor/Services/IPLocator/DefaultIpLocatorFactory.cs

@@ -10,39 +10,31 @@ namespace BootstrapBlazor.Components;
 /// <summary>
 /// IIPLocatorFactory 接口实现类
 /// </summary>
-class DefaultIpLocatorFactory : IIpLocatorFactory
+class DefaultIpLocatorFactory(IServiceProvider provider, IOptionsMonitor<BootstrapBlazorOptions> options) : IIpLocatorFactory
 {
-    private readonly Dictionary<string, IIpLocatorProvider> _providers = [];
-
-    private readonly IServiceProvider _serviceProvider;
-
-    private readonly IOptionsMonitor<BootstrapBlazorOptions> _options;
-
-    public DefaultIpLocatorFactory(IServiceProvider provider, IOptionsMonitor<BootstrapBlazorOptions> options)
-    {
-        _serviceProvider = provider;
-        _options = options;
-
-        foreach (var p in provider.GetServices<IIpLocatorProvider>())
-        {
-            if (p.Key != null)
-            {
-                _providers[p.Key] = p;
-            }
-        }
-    }
+    private Dictionary<string, IIpLocatorProvider>? _providers = null;
 
     /// <summary>
     /// 创建 <see cref="IIpLocatorProvider"/> 实例方法
     /// </summary>
     /// <param name="key"></param>
     public IIpLocatorProvider Create(string? key = null)
     {
-        var providerKey = key;
-        if (string.IsNullOrEmpty(key))
+        _providers ??= GenerateProviders();
+        var providerKey = key ?? options.CurrentValue.IpLocatorOptions.ProviderName;
+        return string.IsNullOrEmpty(providerKey) ? _providers.Values.Last() : _providers[providerKey];
+    }
+
+    private Dictionary<string, IIpLocatorProvider> GenerateProviders()
+    {
+        var providers = new Dictionary<string, IIpLocatorProvider>();
+        foreach (var p in provider.GetServices<IIpLocatorProvider>())
         {
-            providerKey = _options.CurrentValue.IpLocatorOptions.ProviderName;
+            if (p.Key != null)
+            {
+                providers[p.Key] = p;
+            }
         }
-        return string.IsNullOrEmpty(providerKey) ? _providers.Values.Last() : _providers[providerKey];
+        return providers;
     }
 }