feat(MultiSelect): support Flags attribute

[ArgoZhang]

support Flags attribute

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #5239

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

Add support for the Flags attribute to the MultiSelect component.

New Features:

• Allow selecting multiple enum values using flags in the MultiSelect component.

Tests:

• Updated existing tests to cover the new Flags attribute functionality.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces support for the Flags attribute in the MultiSelect component, allowing it to handle enums with the Flags attribute. The changes include modifications to the MultiSelect component to correctly process and display selected values for Flags enums, and a new demo showcasing this functionality.

Sequence diagram for MultiSelect Flags enum value setting

sequenceDiagram
    participant User
    participant MultiSelect
    participant EnumSystem

    User->>MultiSelect: Select multiple enum values
    MultiSelect->>EnumSystem: Check for FlagsAttribute
    MultiSelect->>EnumSystem: Parse selected values
    MultiSelect->>MultiSelect: Calculate combined value
    Note over MultiSelect: Sum up enum values<br/>for Flags representation
    MultiSelect->>MultiSelect: Update CurrentValue

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Class diagram showing MultiSelect component changes for Flags support

classDiagram
    class MultiSelect {
      +TValue CurrentValue
      +string CurrentValueAsString
      +List~SelectedItem~ SelectedItems
      -Type ValueType
      +SetValue() Task
      +ResetRules() void
    }
    note for MultiSelect "Added Flags enum support"

    class MultiSelectEnumFoo {
      <<enumeration>>
      One = 1
      Two = 2
      Three = 4
      Four = 8
    }
    note for MultiSelectEnumFoo "New Flags enum for demo"

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File-Level Changes

Change	Details	Files
Added support for Flags attribute to MultiSelect component.	Modified the SetValue method to handle enums with the Flags attribute. The component now correctly parses and sets the selected values for Flags enums.	src/BootstrapBlazor/Components/Select/MultiSelect.razor.cs
Added a new demo for Flags enums in MultiSelect component.	Added a new DemoBlock to showcase the Flags enum functionality. Added a new enum MultiSelectEnumFoo with the Flags attribute. Added a new property EnumFoo to bind to the MultiSelect component.	src/BootstrapBlazor.Server/Components/Samples/MultiSelects.razor src/BootstrapBlazor.Server/Components/Samples/MultiSelects.razor.cs
Updated MultiSelect component usage in demos.	Updated MultiSelect component usage to use self-closing tags.	src/BootstrapBlazor.Server/Components/Samples/MultiSelects.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5239	Support MultiSelect binding for Flag-attributed enums, allowing automatic selection of multiple enum values	✅
#5239	Enable MultiSelect to work seamlessly with enums that have the [Flag] attribute, such as binding a combined enum value (e.g., EnumEducation.Primary	EnumEducation.Middle)	✅
#5239	Demonstrate the functionality with a sample Flag enum in the component's demo	✅

Possibly linked issues

• feat(MultiSelect): MultiSelect to support Flag Enum #5239: The PR fixes the issue by adding support for Flags attribute in the MultiSelect component. The changes allow the component to work correctly with Flag attributed enums, addressing the data binding problem.
• feat(MultiSelect): MultiSelect to support Flag Enum #5239: The PR fixes the issue by updating the MultiSelect component to support the Flags attribute.
• feat(MultiSelect): MultiSelect to support Flag Enum #5239: The PR fixes the MultiSelect refresh issue mentioned in the issue description.

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 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 (ae7a53c) to head (f816fed).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5253   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          639       639           
  Lines        28733     28752   +19     
  Branches      4080      4084    +4     
=========================================
+ Hits         28733     28752   +19     

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