Issue
The question is confusing, but it is much more clear as described in the following codes:
List<List<T>> listOfList;
// add three lists of List<T> to listOfList, for example
/* listOfList = new {
{ 1, 2, 3}, // list 1 of 1, 3, and 3
{ 4, 5, 6}, // list 2
{ 7, 8, 9} // list 3
};
*/
List<T> list = null;
// how to merger all the items in listOfList to list?
// { 1, 2, 3, 4, 5, 6, 7, 8, 9 } // one list
// list = ???
Not sure if it possible by using C# LINQ or Lambda?
Essentially, how can I concatenate or "flatten" a list of lists?
Solution
Use the SelectMany extension method
list = listOfList.SelectMany(x => x).ToList();
Answered By - JaredPar Answer Checked By - Katrina (PHPFixing Volunteer)
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