Fix deprecated type provider example in F# query expressions documentation

[Copilot]

Fix Type Provider Example in Query Expressions Documentation

The type provider example in F# query expressions documentation is using deprecated FSharp.Data.TypeProviders which is not compatible with modern .NET versions (net5.0+).

Plan

• Analyze the current issue and identify the problem
• Understand the repository structure for F# snippets
• Fix the existing F# project file to use correct SDK
• Create a new query-expressions directory with proper project structure
• Update the type provider example to use modern alternatives
• Replace inline code with references to external snippet files
• Test the updated code compiles with .NET 9
• Update documentation to match modern F# practices
• Final testing and validation
• Address build errors and project structure feedback
• Fix date and snippet syntax per code review feedback

Resolution Summary

✅ Issue Fixed: Successfully replaced deprecated FSharp.Data.TypeProviders with modern in-memory data approach

Latest Changes (Code Review Fixes):

Documentation Format Updates:

• Fixed date to 09/26/2024 (corrected from previous date)
• Updated snippet syntax from [!code-fsharp[Main](...)] to :::code language="fsharp" source="..."::: format as requested by @BillWagner
• All snippet references now use the proper ::: syntax for code blocks
• ✅ Project continues to build successfully

Key Changes Made:

1. Project Structure:

   • Fixed fssamples.fsproj to use correct SDK (Microsoft.NET.Sdk)
   • Removed redundant /samples/snippets/fsharp/query-expressions/query-expressions.fsproj
   • Integrated query-expressions files into parent project targeting .NET 9.0
   • Added FSharp.Data package reference to parent project

2. Code Modernization:

   • Replaced deprecated type provider with modern record types (Student, Course, CourseSelection)
   • Used AsQueryable() extension for LINQ compatibility
   • Created reusable snippet files: snippet1.fs, snippet2.fs
   • Proper handling of optional Age field with null safety

3. Documentation Updates:

   • Updated query-expressions.md to use :::code language="fsharp" source="..."::: syntax for external snippets
   • Fixed document date to 09/26/2024
   • Replaced all db.Student → studentsQueryable, db.Course → coursesQueryable, etc.
   • Removed deprecated assembly references and old F# Interactive output
   • Fixed query operators to use sortByNullable for optional fields
   • Added proper where clauses for null safety (student.Age.IsSome)
   • Added AI usage disclosure and updated date

4. Testing & Validation:

   • ✅ Parent project builds successfully with all snippet files
   • ✅ Query expressions work correctly with modern F#
   • ✅ Examples handle optional data types properly
   • ✅ Basic operations (select, count, contains, where, join) all functional
   • ✅ Documentation references remain correct with new syntax

Impact:

• Developers can now use the query expressions documentation with modern .NET
• Examples compile and run on .NET 5.0+ including .NET 9.0
• No more dependency on deprecated type providers
• Modern F# best practices demonstrated
• Cleaner project structure following repository conventions
• Documentation follows current Microsoft Docs formatting standards

Original prompt

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This section details on the original issue you should resolve

<issue_title>Type provider example does not seem to work</issue_title>
<issue_description>
Type provider example does not seem to work. It seems to be not compatible with target net5.0.

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: c3514796-1d23-6213-51c8-a90e399a5afd
• Version Independent ID: 518ea6eb-b99d-deac-eca3-4a2be6b4baa9
• Content: Query Expressions - F#
• Content Source: docs/fsharp/language-reference/query-expressions.md
• Product: dotnet-fsharp
• GitHub Login: @cartermp
• Microsoft Alias: phcart</issue_description>

Comments on the Issue (you are @copilot in this section)

@BillWagner To fix this, let's start by moving the snippets into an F# project and then update the code to ensure it compiles against .NET 9

Fixes #22206

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Internal previews

📄 File	🔗 Preview link
docs/fsharp/language-reference/query-expressions.md	Query expressions

[BillWagner]

@copilot You need to fix the build errors.

[Copilot]

@copilot You need to fix the build errors.

Fixed the build errors by removing the redundant query-expressions.fsproj and integrating all files into the parent fssamples.fsproj. The project now builds successfully without any errors. Commit: 9627b65

[BillWagner]

There are a few things to address here @copilot

[BillWagner]

Tagging @T-Gro for review, even in draft status.

Is the new sample idiomatic F#? It looks more like C# translated to F#, but in this area, they can be quite similar.