Fix issue 14071: ComboBox.ObjectCollection.CopyTo(Array destination, int index) copies Entry object, not inner item

[SimonZhao888]

Fixes #14071

Proposed changes

• Refactored the CopyTo methods to ensure correct item copying and type safety.

Customer Impact

• Copying ComboBox items to an array or using a collection wrapper will not throw an InvalidCastException exception.

Regression?

• Yes

Risk

• Minimal

Screenshots

Before

https://github.com/user-attachments/assets/c03043ca-133c-49a3-90f9-11a0cd5ba1e1

After

https://github.com/user-attachments/assets/b0c911d7-eecc-4838-a54b-9a9959efff25

Test methodology

• Manually

Test environment(s)

• 10.0.100-rc.2.25502.107

Microsoft Reviewers: Open in CodeFlow

[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 77.15185%. Comparing base (09c759b) to head (80df32d).

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #14075         +/-   ##
===================================================
- Coverage   77.16719%   77.15185%   -0.01535%     
===================================================
  Files           3279        3279                 
  Lines         645317      645317                 
  Branches       47718       47718                 
===================================================
- Hits          497973      497874         -99     
- Misses        143657      143757        +100     
+ Partials        3687        3686          -1     

Flag	Coverage Δ
Debug	77.15185% <0.00000%> (-0.01535%)	:arrow_down:
integration	18.98337% <0.00000%> (-0.03587%)	:arrow_down:
production	52.01170% <0.00000%> (-0.03439%)	:arrow_down:
test	97.40749% <ø> (ø)
unit	49.44068% <0.00000%> (-0.03196%)	:arrow_down:

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