From 58494cb10eeea6a22387e178922451bd4ca89f93 Mon Sep 17 00:00:00 2001
From: Argo-AsicoTech <argo@live.ca>
Date: Thu, 19 Dec 2024 09:45:15 +0800
Subject: [PATCH 1/2] =?UTF-8?q?refactor:=20Lookup=20=E6=9C=8D=E5=8A=A1?=
 =?UTF-8?q?=E7=A4=BA=E4=BE=8B=E6=94=B9=E4=B8=BA=E5=BC=82=E6=AD=A5?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Services/DemoLookupService.cs             | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/BootstrapBlazor.Server/Services/DemoLookupService.cs b/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
index f75e384897b..2d8e3d9335c 100644
--- a/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
+++ b/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
@@ -10,14 +10,28 @@ namespace Microsoft.Extensions.DependencyInjection;
 /// </summary>
 internal class DemoLookupService(IServiceProvider provider) : LookupServiceBase
 {
-    private IServiceProvider Provider { get; } = provider;
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    /// <param name="key"></param>
+    /// <param name="data"></param>
+    /// <returns></returns>
+    public override IEnumerable<SelectedItem>? GetItemsByKey(string? key, object? data) => null;
 
-    public override IEnumerable<SelectedItem>? GetItemsByKey(string? key, object? data)
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    /// <param name="key"></param>
+    /// <param name="data"></param>
+    /// <returns></returns>
+    public override async Task<IEnumerable<SelectedItem>?> GetItemsByKeyAsync(string? key, object? data)
     {
+        await Task.Delay(1);
+
         IEnumerable<SelectedItem>? items = null;
         if (key == "Foo.Complete")
         {
-            var localizer = Provider.GetRequiredService<IStringLocalizer<Foo>>();
+            var localizer = provider.GetRequiredService<IStringLocalizer<Foo>>();
             items = new List<SelectedItem>()
             {
                 new() { Value = "True", Text = localizer["True"].Value },

From bb8699dfb96507d6426aa3333697c84ed2a57ec7 Mon Sep 17 00:00:00 2001
From: Argo-AsicoTech <argo@live.ca>
Date: Thu, 19 Dec 2024 10:16:53 +0800
Subject: [PATCH 2/2] =?UTF-8?q?doc:=20=E6=9B=B4=E6=96=B0=20Lookup=20?=
 =?UTF-8?q?=E7=A4=BA=E4=BE=8B?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Services/DemoLookupService.cs             | 29 ++++++++++++++-----
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/BootstrapBlazor.Server/Services/DemoLookupService.cs b/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
index 2d8e3d9335c..1e50be4fe54 100644
--- a/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
+++ b/src/BootstrapBlazor.Server/Services/DemoLookupService.cs
@@ -3,6 +3,8 @@
 // See the LICENSE file in the project root for more information.
 // Maintainer: Argo Zhang(argo@live.ca) Website: https://www.blazor.zone
 
+using System.Collections.Concurrent;
+
 namespace Microsoft.Extensions.DependencyInjection;
 
 /// <summary>
@@ -18,6 +20,8 @@ internal class DemoLookupService(IServiceProvider provider) : LookupServiceBase
     /// <returns></returns>
     public override IEnumerable<SelectedItem>? GetItemsByKey(string? key, object? data) => null;
 
+    private static readonly ConcurrentDictionary<string, List<SelectedItem>> _cache = [];
+
     /// <summary>
     /// <inheritdoc/>
     /// </summary>
@@ -26,17 +30,28 @@ internal class DemoLookupService(IServiceProvider provider) : LookupServiceBase
     /// <returns></returns>
     public override async Task<IEnumerable<SelectedItem>?> GetItemsByKeyAsync(string? key, object? data)
     {
-        await Task.Delay(1);
-
         IEnumerable<SelectedItem>? items = null;
         if (key == "Foo.Complete")
         {
-            var localizer = provider.GetRequiredService<IStringLocalizer<Foo>>();
-            items = new List<SelectedItem>()
+            // 使用缓存技术防止多次调用提高应用性能
+            if (_cache.TryGetValue(key, out var value))
             {
-                new() { Value = "True", Text = localizer["True"].Value },
-                new() { Value = "False", Text = localizer["False"].Value }
-            };
+                items = value;
+            }
+            else
+            {
+                // 模拟异步延时实战中大概率从数据库中获得数据
+                await Task.Delay(1);
+
+                var localizer = provider.GetRequiredService<IStringLocalizer<Foo>>();
+                var v = new List<SelectedItem>()
+                {
+                    new() { Value = "True", Text = localizer["True"].Value },
+                    new() { Value = "False", Text = localizer["False"].Value }
+                };
+                _cache.TryAdd(key, v);
+                items = v;
+            }
         }
         return items;
     }