Convert List> to Dictionary C#

Question

I have two List:

var listA = new List<List<int>> {
    new List<int> { 1, 2, 3, 4 },
    new List<int> { 4, 5, 6, 7 },
    new List<int> { 6, 7, 8, 9 }
};

var listB = new List<string> { "number1", "number2", "number3", "number4" };

How to convert them to dictionary with listA is value, listB is key?

whats the expected output? and what you want the value for key "number4" as listB has 4 element and listA has 3 child list.? — Deepak Sharma, Mar 19 '18 at 05:04

score 0 · Answer 1 · answered Mar 19 '18 at 04:38

0

You can use ToDictionary method as following:

var listA = new List<List<int>> {
    new List<int> { 1, 2, 3, 4 },
    new List<int> { 4, 5, 6, 7 },
    new List<int> { 6, 7, 8, 9 }
};

var listB = new List<string> { "number1", "number2", "number3", "number4" };

var dic = listB.Select((k, i) => new { key = k, value = listA[i] })
          .ToDictionary(x => x.key, x => x.value);

//now, dic["number1"] is List<int> { 1, 2, 3, 4 }

answered Mar 19 '18 at 04:38

S.Serpooshan

7,608
4
33
61

1

you can get error, as listB has 4 element and listA has 3, so in above code you will get error. – Deepak Sharma Mar 19 '18 at 05:04
@DeepakSharma I think it is just a sample to show what which is need – S.Serpooshan Mar 19 '18 at 08:06

Convert List> to Dictionary C#

1 Answers1