I need help with understanding the flow of LINQ query expressions

Hello, i'm starting to learn the LINQ language and i don't know if i got my understanding of the process of executing right. My "theory" on example below from official Microsoft documentation is this:
1. It splits students into a row of student
2. It groups every student by the Year property into studentGroups
3. It Selects new Anonymous type with Level and HighScore of the group
I'm sorry if i messed it up but thats the reason why I'm even creating this post.
My theory number two is that everything under from except select and let applies directly to from. I couldn't find which one of these theories is right if even any of them is :D

var queryGroupMax =
    from student in students
    group student by student.Year into studentGroup
    select new
    {
        Level = studentGroup.Key,
        HighestScore = (
            from student2 in studentGroup
            select student2.ExamScores.Average()
        ).Max()
    };

var queryGroupMax =
    from student in students
    group student by student.Year into studentGroup
    select new
    {
        Level = studentGroup.Key,
        HighestScore = (
            from student2 in studentGroup
            select student2.ExamScores.Average()
        ).Max()
    };

Thanks for your time,
Mark

PS: I get what it is doing and i do understand all the keywords just don't know the order of execution

C#•3y ago•

4 replies

Marek

I need help with understanding the flow of LINQ query expressions

var queryGroupMax =
    from student in students
    group student by student.Year into studentGroup
    select new
    {
        Level = studentGroup.Key,
        HighestScore = (
            from student2 in studentGroup
            select student2.ExamScores.Average()
        ).Max()
    };

var queryGroupMax =
    from student in students
    group student by student.Year into studentGroup
    select new
    {
        Level = studentGroup.Key,
        HighestScore = (
            from student2 in studentGroup
            select student2.ExamScores.Average()
        ).Max()
    };

Thanks for your time,
Mark

PS: I get what it is doing and i do understand all the keywords just don't know the order of execution

I need help with understanding the flow of LINQ query expressions

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