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The first from clause (from student in students) iterates over each student in the students collection. The second from clause (f rom course in student.Courses ) iterates over each course in the current student’s Courses list.
- Differences Between LINQ JOIN and GROUP JOIN Methods
Key Differences Between LINQ Join and GroupJoin: Result...
- Differences Between LINQ JOIN and GROUP JOIN Methods
29 maj 2024 · A join of two data sources associates objects with objects that share an attribute across data sources. Learn about join methods in the LINQ framework in C#.
The way you'd do a join on more than one criteria generally is to use an anonymous type: join pc in productcategory on new { Id = p.Id, Other = p.Other } equals new { Id = pc.ProdId, Other = pc.Other }. This works in Linq-to-Objects, and I presume the same will work with database queries as well.
Join basically creates a new collection by taking each item from first collection and combining it with each item on the second collection where the join conditions are met. For example, students.Join( enrolments, s => s.Id, e => e.StudentId, (s, e) => new { Student = s.Id, Enrolment = e.Id });
Key Differences Between LINQ Join and GroupJoin: Result Shape: JOIN returns a flat result set combining elements from both collections. GROUP JOIN returns a hierarchical result set, pairing each element from the first collection with a collection of matching elements from the second collection.
7 wrz 2023 · I think most C# developers would agree that LINQ is an integral part of the experience of writing code with the language. LINQ provides a fluent, intuitive, and consistent way to query data sets. In this post, we’ll help in your LINQ-mastering quest by covering the LINQ join operator.
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