Modernize C# snippets (System.Collections.Generic)

[gewarren]

Contributes to #12713.

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File	Preview link
snippets/csharp/System.Collections.Generic/ComparerT/Overview/program.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source1.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source2.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source3.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source4.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/source2.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Add/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Contains/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.GetEnumerator/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Item/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Keys/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Remove/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Values/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/EqualityComparerT/Default/program.cs	Preview published page
snippets/csharp/System.Collections.Generic/EqualityComparerT/Overview/program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/source2.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/Clear/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/Contains/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/IsProperSubsetOf/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/HashSetT/SymmetricExceptWith/Program.cs	Preview published page
snippets/csharp/System.Collections.Generic/ICollectionT/Overview/program.cs	Preview published page
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/source.cs	Preview published page
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/source2.cs	Preview published page
snippets/csharp/System.Collections.Generic/IEnumerableT/Overview/program.cs	Preview published page
snippets/csharp/System.Collections.Generic/LinkedListNodeT/Overview/llnctor.cs	Preview published page
snippets/csharp/System.Collections.Generic/LinkedListT/.ctor/llctor.cs	Preview published page

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[Copilot]

Pull request overview

Modernizes System.Collections.Generic C# documentation snippets and adds .NET 10 compilation harnesses for multi-example directories.

Changes:

• Adopts collection expressions, target-typed new, built-in aliases, and consistent formatting.
• Renames conflicting entry points and adds shared runners.
• Adds .NET 10 projects and removes an obsolete package reference.

Reviewed changes

Copilot reviewed 92 out of 92 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
snippets/csharp/System.Collections.Generic/StackT/Overview/source.cs	Modernizes stack syntax.
snippets/csharp/System.Collections.Generic/SortedSetT/Overview/program.cs	Modernizes set construction and formatting.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/System.Collections.IDictionary.Add/source.cs	Modernizes initialization and loops.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/source.cs	Modernizes the overview example.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/remarks.cs	Modernizes the remarks example.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/Overview/Program.cs	Runs overview examples.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source4.cs	Modernizes constructor example 5.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source3.cs	Modernizes constructor example 4.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source2.cs	Modernizes constructor example 3.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source1.cs	Modernizes constructor example 2.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/source.cs	Modernizes constructor example 1.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/SortedListTKey,TValue/.ctor/Program.cs	Runs constructor examples.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/System.Collections.IDictionary.Add/source.cs	Modernizes initialization and loops.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/Overview/source.cs	Modernizes the overview example.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/.ctor/source2.cs	Modernizes constructor example 3.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/.ctor/source1.cs	Modernizes constructor example 2.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/.ctor/source.cs	Modernizes constructor example 1.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/.ctor/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/SortedDictionaryTKey,TValue/.ctor/Program.cs	Runs constructor examples.
snippets/csharp/System.Collections.Generic/QueueT/Overview/source.cs	Modernizes queue syntax.
snippets/csharp/System.Collections.Generic/ListT/Sort/Sort1.cs	Modernizes and namespaces sort example 1.
snippets/csharp/System.Collections.Generic/ListT/Sort/RunExamples.cs	Runs sort examples.
snippets/csharp/System.Collections.Generic/ListT/Sort/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/ListT/Sort/program.cs	Modernizes and namespaces sort example 2.
snippets/csharp/System.Collections.Generic/ListT/Reverse/source.cs	Modernizes list initialization and loops.
snippets/csharp/System.Collections.Generic/ListT/Overview/source.cs	Modernizes overview example 1.
snippets/csharp/System.Collections.Generic/ListT/Overview/RunExamples.cs	Runs list overview examples.
snippets/csharp/System.Collections.Generic/ListT/Overview/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/ListT/Overview/program.cs	Modernizes overview example 2.
snippets/csharp/System.Collections.Generic/ListT/LastIndexOf/source.cs	Modernizes list initialization.
snippets/csharp/System.Collections.Generic/ListT/IndexOf/source.cs	Modernizes list initialization.
snippets/csharp/System.Collections.Generic/ListT/FindIndex/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/ListT/FindIndex/Program.cs	Runs FindIndex examples.
snippets/csharp/System.Collections.Generic/ListT/FindIndex/FindIndex3.cs	Modernizes and namespaces example 3.
snippets/csharp/System.Collections.Generic/ListT/FindIndex/FindIndex2.cs	Modernizes and namespaces example 2.
snippets/csharp/System.Collections.Generic/ListT/FindIndex/FindIndex1.cs	Modernizes and namespaces example 1.
snippets/csharp/System.Collections.Generic/ListT/Find/program.cs	Modernizes Find examples.
snippets/csharp/System.Collections.Generic/ListT/Exists/source.cs	Modernizes list and string syntax.
snippets/csharp/System.Collections.Generic/ListT/CopyTo/source.cs	Modernizes list initialization and loops.
snippets/csharp/System.Collections.Generic/ListT/Contains/program1.cs	Modernizes part-list initialization.
snippets/csharp/System.Collections.Generic/ListT/Contains/program.cs	Modernizes cube-list initialization.
snippets/csharp/System.Collections.Generic/ListT/Capacity/program.cs	Uses an empty collection expression.
snippets/csharp/System.Collections.Generic/ListT/BinarySearch/source2.cs	Modernizes and namespaces example 3.
snippets/csharp/System.Collections.Generic/ListT/BinarySearch/source1.cs	Modernizes and namespaces example 2.
snippets/csharp/System.Collections.Generic/ListT/BinarySearch/source.cs	Modernizes and namespaces example 1.
snippets/csharp/System.Collections.Generic/ListT/BinarySearch/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/ListT/BinarySearch/Program.cs	Runs BinarySearch examples.
snippets/csharp/System.Collections.Generic/ListT/.ctor/source1.cs	Converts the example into a runnable class.
snippets/csharp/System.Collections.Generic/ListT/.ctor/source.cs	Renames the constructor example.
snippets/csharp/System.Collections.Generic/ListT/.ctor/RunExamples.cs	Runs list constructor examples.
snippets/csharp/System.Collections.Generic/LinkedListT/Overview/source.cs	Modernizes linked-list syntax and output comments.
snippets/csharp/System.Collections.Generic/LinkedListT/.ctor/llctor.cs	Uses aliases and target-typed construction.
snippets/csharp/System.Collections.Generic/LinkedListNodeT/Overview/llnctor.cs	Modernizes formatting and construction.
snippets/csharp/System.Collections.Generic/IEnumerableT/Overview/program.cs	Modernizes formatting and collection syntax.
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/source2.cs	Modernizes overview example 2.
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/source.cs	Modernizes overview example 1.
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/IDictionaryTKey,TValue/Overview/Program.cs	Runs interface overview examples.
snippets/csharp/System.Collections.Generic/ICollectionT/Overview/program.cs	Modernizes collection initialization and formatting.
snippets/csharp/System.Collections.Generic/HashSetT/SymmetricExceptWith/Program.cs	Uses empty collection expressions.
snippets/csharp/System.Collections.Generic/HashSetT/Overview/Program.cs	Modernizes set construction.
snippets/csharp/System.Collections.Generic/HashSetT/IsProperSubsetOf/Program.cs	Modernizes set construction and comments.
snippets/csharp/System.Collections.Generic/HashSetT/Contains/Program.cs	Modernizes construction and braces.
snippets/csharp/System.Collections.Generic/HashSetT/Clear/Program.cs	Uses an empty collection expression.
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/source2.cs	Modernizes constructor example 2.
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/RunExamples.cs	Runs HashSet constructor examples.
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/HashSetT/.ctor/Program.cs	Converts example 1 to a shared runner.
snippets/csharp/System.Collections.Generic/EqualityComparerT/Overview/program.cs	Uses aliases and target-typed construction.
snippets/csharp/System.Collections.Generic/EqualityComparerT/Default/program.cs	Replaces inferred locals with explicit types.
snippets/csharp/System.Collections.Generic/EqualityComparerT/Default/cs.csproj	Removes the obsolete ValueTuple package.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Values/source.cs	Modernizes dictionary initialization and loops.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Remove/source.cs	Modernizes dictionary initialization.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Keys/source.cs	Modernizes dictionary initialization and loops.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Item/source.cs	Modernizes dictionary initialization.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.GetEnumerator/source.cs	Modernizes initialization and enumeration.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Contains/source.cs	Modernizes dictionary initialization.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/System.Collections.IDictionary.Add/source.cs	Modernizes initialization and loops.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/source2.cs	Modernizes overview example 2.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/source.cs	Modernizes overview example 1.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/Overview/Program.cs	Runs dictionary overview examples.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source4.cs	Modernizes constructor example 5.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source3.cs	Modernizes constructor example 4.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source2.cs	Modernizes constructor example 3.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source1.cs	Modernizes constructor example 2.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/source.cs	Modernizes constructor example 1.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/Project.csproj	Adds a .NET 10 project.
snippets/csharp/System.Collections.Generic/DictionaryTKey,TValue/.ctor/Program.cs	Runs dictionary constructor examples.
snippets/csharp/System.Collections.Generic/ComparerT/Overview/program.cs	Modernizes comparer example construction.

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