K1Lesson 36 of 49about 180 minutes
LINQ: grouping, and when a query really runs
What you learn in this lesson
- group by one or several properties with GroupBy and count and add up per group
- summarize results with ToDictionary, CountBy, Distinct and DistinctBy
- explain that a LINQ query runs only when it’s looped through, and anew every time
- put ToList in the right place: before changing a list and before a result is needed more than once
- determine ISO weeks by ISO 8601, across the turn of the year too
This lesson belongs to course K1
You will see this lesson's text and video once you have bought the course. The goals above show what you learn here.
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