From the course: .NET Essentials: Working with LINQ
Join today to access over 22,500 courses taught by industry experts.
Flatten sequence with SelectMany - .NET Tutorial
From the course: .NET Essentials: Working with LINQ
Flatten sequence with SelectMany
- [Instructor] How many times in this course have we used the SELECT clause, or the select extension method? I don't know the number but it's a lot. What I want to look at in this video is a related method called SelectMany. I put it in the group chapter because it's kind of the opposite of grouping it's flattening a bunch of information, a bunch of items in a sequence. So let's think about groups for a minute, when you put items into group you end up with a group that has many elements. So that's a one to many relationship, there's the group and there's many values in that group. SelectMany, also works with a one to many relationship, but it takes all of the groups of information and flattens them out into a single sequence. So to make this work, I created some new types here. I created a class called HistoryCalendar, has a decade which is a string and then and this is the many relationship, it has a list of ints which I…
Download courses and learn on the go
Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.
Contents
-
-
-
-
-
-
-
-
-
-
-
The GroupBy method2m 27s
-
GroupBy query expression1m 53s
-
GroupBy with ElementSelector2m 36s
-
GroupBy with ResultSelector2m 29s
-
Iterate over groups1m 44s
-
Combine two sequences3m 47s
-
Flatten sequence with SelectMany2m 15s
-
Challenge: Group results by color values2m 30s
-
Solution: Group results by color values1m 35s
-
-
-
-
-
-
-