While the release of .NET 9 is planned for November 2024, the preview version is already available. One of the new .NET 9 features is the new LINQ methods: CountBy, AggregateBy, and Index. In this article, I present how to use these methods.

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Discover the new LINQ methods in .NET 9 Preview and learn how to use CountBy, AggregateBy, and Index for grouping items, finding the most frequent word, and extracting index positions in a list.

New LINQ Methods in .NET 9 Preview