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Join and GroupJoin Sequences

Understand how to use LINQ's Join and GroupJoin extension methods to combine and group data from multiple sequences. This lesson guides you through practical examples with categories and products, demonstrating sorting and grouping outputs for effective data querying in C#.

There are two extension methods for joining and grouping:

  • Join: This method has four parameters: the sequence we want to join with, the property or properties on the left sequence to match on, the property or properties on the right sequence to match on, and a projection.

  • GroupJoin: This method has the same parameters but combines the matches into a group object with a Key property for the matching value and an IEnumerable<T> type for the multiple matches. ... ...

Joining sequences