fix(CacheManager): GetJsonStringByTypeName prevent throw ArgumentNull exception

src/BootstrapBlazor/Localization/Json/JsonLocalizationOptions.cs

@@ -43,6 +43,11 @@ public class JsonLocalizationOptions : LocalizationOptions
     /// </summary>
     public bool IgnoreLocalizerMissing { get; set; }
 
+    /// <summary>
+    /// 获得/设置 如果 Value 值为 null 时使用 Key 代替 默认 false 触发异常
+    /// </summary>
+    public bool UseKeyWhenValueIsNull { get; set; }
+
     /// <summary>
     /// 获得/设置 资源文件是否热加载 默认 false
     /// </summary>

src/BootstrapBlazor/Services/CacheManager.cs

@@ -152,10 +152,7 @@ public static int ElementCount(object? value)
                 entry.SetDynamicAssemblyPolicy(type);
                 return LambdaExtensions.CountLambda(type).Compile();
             });
-            if (invoker != null)
-            {
-                ret = invoker(value);
-            }
+            ret = invoker(value);
         }
         return ret;
     }
@@ -237,12 +234,20 @@ private static JsonLocalizationOptions GetJsonLocalizationOption()
             Instance.Cache.Remove(key);
             Instance.Cache.Remove(typeKey);
         }
-        return Instance.GetOrCreate(typeKey, entry =>
+        return Instance.GetOrCreate(typeKey, _ =>
         {
-            var sections = Instance.GetOrCreate(key, entry => option.GetJsonStringFromAssembly(assembly, cultureName));
+            var sections = Instance.GetOrCreate(key, _ => option.GetJsonStringFromAssembly(assembly, cultureName));
             var items = sections.FirstOrDefault(kv => typeName.Equals(kv.Key, StringComparison.OrdinalIgnoreCase))?
                 .GetChildren()
-                .SelectMany(kv => new[] { new LocalizedString(kv.Key, kv.Value!, false, typeName) });
+                .Select(kv =>
+                {
+                    var value = kv.Value;
+                    if (value == null && option.UseKeyWhenValueIsNull == true)
+                    {
+                        value = kv.Key;
+                    }
+                    return new LocalizedString(kv.Key, value ?? "", false, typeName);
+                });
 #if NET8_0_OR_GREATER
             return items?.ToFrozenSet();
 #else

test/UnitTest/Locales/en-US.json

@@ -25,5 +25,9 @@
     "PlaceHolder": "Click to select ...",
     "Primary": "Primary",
     "Middle": "Middle"
+  },
+  "UnitTest.Utils.UtilityTest": {
+    "Test-Null": null,
+    "Test-Key:": ""
   }
 }

test/UnitTest/Utils/UtilityTest.cs

@@ -379,6 +379,34 @@ public void GetJsonStringByTypeName_Ok()
         Utility.GetJsonStringByTypeName(option, dynamicType!.Assembly, "Test");
     }
 
+    [Fact]
+    public void GetJsonStringByTypeName_UseKeyWhenValueIsNull()
+    {
+        // improve code coverage
+        var option = Context.Services.GetRequiredService<IOptions<JsonLocalizationOptions>>().Value;
+        option.UseKeyWhenValueIsNull = true;
+        var items = Utility.GetJsonStringByTypeName(option, this.GetType().Assembly, "UnitTest.Utils.UtilityTest", "en-US", true);
+
+        var test1 = items.FirstOrDefault(i => i.Name == "Test-Null");
+        Assert.NotNull(test1);
+        Assert.Equal("", test1.Value);
+
+        var test2 = items.FirstOrDefault(i => i.Name == "Test-Key");
+        Assert.NotNull(test2);
+        Assert.Equal("Test-Key", test2.Value);
+
+        option.UseKeyWhenValueIsNull = false;
+        items = Utility.GetJsonStringByTypeName(option, this.GetType().Assembly, "UnitTest.Utils.UtilityTest", "en-US", true);
+
+        test1 = items.FirstOrDefault(i => i.Name == "Test-Null");
+        Assert.NotNull(test1);
+        Assert.Equal("", test1.Value);
+
+        test2 = items.FirstOrDefault(i => i.Name == "Test-Key");
+        Assert.NotNull(test2);
+        Assert.Equal("", test2.Value);
+    }
+
     private class MockDynamicObject : IDynamicObject
     {
         public Guid DynamicObjectPrimaryKey { get; set; }