fix(CacheManager): GetJsonStringByTypeName prevent throw ArgumentNull exception

[densen2014]

CacheManager GetLocalizedString Key.Value Null

CacheManager GetLocalizedString Key.Value Null

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Description

fixes #5103

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

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Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Bug Fixes:

• Fix a bug where CacheManager.GetLocalizedString returned null values when the resource value was not found.

[bb-auto]

Thanks for your PR, @densen2014. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request fixes a bug in the CacheManager.GetLocalizedString method where the Value property of the LocalizedString object could be null. The fix ensures that if the value is null, the key is used instead.

Class diagram showing LocalizedString handling in CacheManager

classDiagram
    class CacheManager {
        -JsonLocalizationOptions GetJsonLocalizationOption()
        +GetLocalizedString(string key)
    }
    class LocalizedString {
        +string Key
        +string Value
        +bool ResourceNotFound
        +string SearchedLocation
    }
    note for LocalizedString "Value now falls back to Key if null"
    CacheManager ..> LocalizedString : creates

Loading

File-Level Changes

Change	Details	Files
Handle null values in LocalizedString	Use the key as the value if the value is null in the LocalizedString constructor. Added a null check for the kv.Value in the SelectMany lambda expression. Updated the logic to fallback to the key if the value is null, ensuring a non-null value for the localized string	src/BootstrapBlazor/Services/CacheManager.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5103	Handle potential JSON parsing errors when loading localization files	✅
#5103	Prevent system crash when a localization file has formatting issues	✅
#5103	Implement a fallback mechanism for invalid or missing localization values	✅

Possibly linked issues

• bug(Locales): 切换多语言,json格式异常,某些条件下会崩溃 #5103: The PR fixes a null value issue in the CacheManager that could lead to the crash described in the issue.
• bug(Locales): 切换多语言,json格式异常,某些条件下会崩溃 #5103: The PR fixes issue bug(Locales): 切换多语言,json格式异常,某些条件下会崩溃 #5103 by handling null values in CacheManager.GetLocalizedString, addressing the localization error message problem.

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[sourcery-ai]

Hey @densen2014 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6a85589) to head (d942d6d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5106   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          634       634           
  Lines        28159     28165    +6     
  Branches      4039      4040    +1     
=========================================
+ Hits         28159     28165    +6     

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