feat(working-with-themes): add 40 compiler-validated C# examples - Working With Themes [26.8.0/net8.0]

[agent-aspose-diagram-examples]

Working With Themes — Compiler-Validated C# Examples

What this PR does

Adds 40 AI-generated, compiler-validated C# examples for the Working With Themes category of Aspose.Diagram for .NET.

All examples were generated by the Aspose.Diagram Examples Generator Agent and passed the full three-attempt validation pipeline before being included.

Validation Summary

Check	Result
dotnet build	✅ Passed — zero compiler errors
dotnet run	✅ Passed — clean execution
Aspose.Diagram Version	26.8.0
Target Framework	net8.0
Examples Added	40

Pipeline

Each example was generated and validated through:

1. Attempt 1 — MCP direct code retrieval and assembly
2. Attempt 2 — MCP retrieval with injected API correction rules
3. Attempt 3 — LLM repair pass with compiler errors and rules

Only examples that passed both dotnet build and dotnet run are included in this PR.

Examples Added

File	Task Description
after-applying-a-theme-extract-the-theme-s-color-palette-and-write-it-to-a-json-configuration-file.cs	After applying a theme extract the theme s color palette and write it to a json configuration file
apply-a-different-preset-theme-variant-to-shapes-on-a-page-based-on-their-layer-membership.cs	Apply a different preset theme variant to shapes on a page based on their layer membership
apply-a-preset-theme-quickstyle-to-all-shapes-on-a-page-that-use-a-particular-master-style.cs	Apply a preset theme quickstyle to all shapes on a page that use a particular master style
apply-a-preset-theme-quickstyle-to-shapes-filtered-by-their-geometry-type-such-as-rectangles-only.cs	Apply a preset theme quickstyle to shapes filtered by their geometry type such as rectangles only
apply-a-preset-theme-quickstyle-to-shapes-selected-via-a-linq-query-based-on-their-text-content.cs	Apply a preset theme quickstyle to shapes selected via a linq query based on their text content
apply-a-preset-theme-to-a-page-then-flatten-the-page-to-ensure-theme-persistence-in-exported-formats.cs	Apply a preset theme to a page then flatten the page to ensure theme persistence in exported formats
apply-a-preset-theme-to-a-shape-only-if-its-current-theme-does-not-match-the-desired-preset.cs	Apply a preset theme to a shape only if its current theme does not match the desired preset
apply-a-preset-theme-to-all-shapes-that-share-a-specific-custom-property-value.cs	Apply a preset theme to all shapes that share a specific custom property value
apply-a-preset-theme-to-shapes-only-when-their-current-theme-matrix-differs-from-the-target-matrix.cs	Apply a preset theme to shapes only when their current theme matrix differs from the target matrix
apply-a-preset-theme-variant-to-a-shape-group-by-iterating-through-its-child-shapes-and-setting-each.cs	Apply a preset theme variant to a shape group by iterating through its child shapes and setting each
apply-a-preset-theme-variant-to-a-shape-only-if-the-shape-s-existing-theme-matrix-contains-a-color.cs	Apply a preset theme variant to a shape only if the shape s existing theme matrix contains a color
batch-process-diagrams-in-parallel-applying-a-common-preset-theme-to-each-and-saving-results-concurrently.cs	Batch process diagrams in parallel applying a common preset theme to each and saving results concurrently
clone-the-theme-settings-from-one-page-and-apply-them-to-another-page-within-the-same-diagram.cs	Clone the theme settings from one page and apply them to another page within the same diagram
compare-the-theme-settings-of-a-shape-before-and-after-applying-a-quickstyle-to-verify-changes.cs	Compare the theme settings of a shape before and after applying a quickstyle to verify changes
create-a-configuration-file-that-maps-page-names-to-preset-themes-and-apply-them-programmatically.cs	Create a configuration file that maps page names to preset themes and apply them programmatically
create-a-script-that-reads-theme-preferences-from-a-database-and-applies-them-to-corresponding-diagram-pages.cs	Create a script that reads theme preferences from a database and applies them to corresponding diagram pages
create-a-unit-test-that-verifies-a-shape-s-presettheme-property-changes-after-applying-a-new-theme.cs	Create a unit test that verifies a shape s presettheme property changes after applying a new theme
export-a-themed-diagram-to-pdf-and-inspect-the-visual-consistency-across-all-pages.cs	Export a themed diagram to pdf and inspect the visual consistency across all pages
export-the-diagram-after-theming-to-both-pdf-and-xps-formats-to-compare-rendering-fidelity.cs	Export the diagram after theming to both pdf and xps formats to compare rendering fidelity
export-the-themed-diagram-to-svg-format-for-web-preview-after-applying-page-level-themes.cs	Export the themed diagram to svg format for web preview after applying page level themes
generate-a-report-listing-each-shape-s-original-theme-and-the-new-preset-theme-after-modification.cs	Generate a report listing each shape s original theme and the new preset theme after modification
implement-a-retry-mechanism-when-setting-a-preset-theme-on-a-shape-that-may-be-locked.cs	Implement a retry mechanism when setting a preset theme on a shape that may be locked
implement-error-handling-to-catch-exceptions-when-applying-a-theme-to-a-shape-lacking-style-data.cs	Implement error handling to catch exceptions when applying a theme to a shape lacking style data
implement-logging-to-capture-each-theme-application-step-including-page-name-shape-id-and-applied-preset.cs	Implement logging to capture each theme application step including page name shape id and applied preset
iterate-through-all-pages-in-a-diagram-and-assign-the-same-preset-theme-variant-to-each-page.cs	Iterate through all pages in a diagram and assign the same preset theme variant to each page
load-a-diagram-from-a-byte-array-apply-a-theme-variant-and-return-the-modified-byte-array.cs	Load a diagram from a byte array apply a theme variant and return the modified byte array
load-a-diagram-remove-all-existing-theme-settings-then-apply-a-fresh-preset-theme-to-standardize-appearance.cs	Load a diagram remove all existing theme settings then apply a fresh preset theme to standardize appearance
load-a-vsdx-diagram-from-disk-and-apply-a-preset-theme-to-its-first-page.cs	Load a vsdx diagram from disk and apply a preset theme to its first page
load-multiple-vsdx-files-from-a-folder-apply-a-uniform-preset-theme-and-save-them-back.cs	Load multiple vsdx files from a folder apply a uniform preset theme and save them back
measure-the-execution-time-of-applying-a-preset-theme-to-a-large-diagram-with-thousands-of-shapes.cs	Measure the execution time of applying a preset theme to a large diagram with thousands of shapes
reset-the-presettheme-of-a-shape-to-the-default-value-to-remove-previously-applied-styling.cs	Reset the presettheme of a shape to the default value to remove previously applied styling
retrieve-the-current-presetthemevariant-from-each-shape-and-log-it-for-diagnostic-purposes.cs	Retrieve the current presetthemevariant from each shape and log it for diagnostic purposes
save-a-diagram-with-applied-themes-to-a-memory-stream-for-further-processing-without-disk-i-o.cs	Save a diagram with applied themes to a memory stream for further processing without disk i o
set-the-presettheme-property-on-a-specific-shape-identified-by-its-id-to-change-its-appearance.cs	Set the presettheme property on a specific shape identified by its id to change its appearance
use-a-dictionary-to-map-shape-ids-to-specific-preset-themes-and-apply-them-accordingly.cs	Use a dictionary to map shape ids to specific preset themes and apply them accordingly
use-a-loop-to-apply-different-preset-themes-to-each-page-based-on-its-index-position.cs	Use a loop to apply different preset themes to each page based on its index position
use-asynchronous-loading-of-a-vsdx-file-then-apply-a-preset-theme-to-its-pages-concurrently.cs	Use asynchronous loading of a vsdx file then apply a preset theme to its pages concurrently
use-setpresetthemestylematrics-to-assign-a-custom-style-matrix-to-a-shape-for-advanced-formatting.cs	Use setpresetthemestylematrics to assign a custom style matrix to a shape for advanced formatting
validate-that-applying-a-preset-theme-does-not-alter-shape-geometry-by-comparing-bounding-boxes-before-and-after.cs	Validate that applying a preset theme does not alter shape geometry by comparing bounding boxes before and after
validate-that-the-applied-preset-theme-matches-the-expected-theme-by-comparing-theme-identifiers-after-saving.cs	Validate that the applied preset theme matches the expected theme by comparing theme identifiers after saving

Validation Details

• ✅ dotnet build — compiled without errors against Aspose.Diagram for .NET 26.8.0
• ✅ dotnet run — executed without unhandled exceptions
• 🤖 Generated by Aspose.Diagram Examples Generator Agent v2.0

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This PR was created automatically by the Aspose.Diagram Examples Generator Agent. Merge after reviewing the examples above.