CODEWITHSUNDEEP
c#
willa
willa

Reputation: 669

Linq First Item

I have a Linq statement which concats three lists together:

var FinshedResults = QualificationList.Zip(SubjectList, (x, y) => x + y).Zip(GradeList, (x, y) => x + y);

The out put this is giving me is:

A Level - Test 1 (A*) A Level - Test 2 (A) A Level - Test 3 (B) A Level - Test 4 (C) A Level - Test 5 (D) A Level - Test 6 (E) A Level - Test 6 (E) A Level - Test 7 (F)

The A Level is stored in QualificationList I was just wondering whether we can make it so A - Level is printed out once and the rest have Test 1 etc. So the out put would more be like;

A Level - Test 1 (A) Test 2 (A) Test 3 (B) Test 4 (C) Test 5 (D) Test 6 (E) Test 6 (E) Test 7 (F)

Is it possible to make QualificationList only print out once? Or would this have to be handled in the loop? Thanks for any advice which you can give.

Upvotes: 0

Views: 108

Answers (1)

Selman Genç
Selman Genç

Reputation: 101731

Try something like this:

QualificationList
.GroupBy(x => x)
.SelectMany(g => new[] { g.Key }.Concat(Enumerable.Repeat("", g.Count() - 1))
.Zip(SubjectList, (x, y) => x + y)
.Zip(GradeList, (x, y) => x + y);

I'm assuming QualificationList is a list of strings. This query simple groups QualificationList and then returns a sequence of elements for each group where the first element is the Key (for example A Level) the rest is an empty string. Then just uses Zip like you did, the only difference is rest of the elements are concatenated with empty string so the A Level won't appear more than once.

Upvotes: 1

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