CODEWITHSUNDEEP
c#dictionary
Passionate.C
Passionate.C

Reputation: 243

Simple and Best way to convert Dictionary<key, List<obj>> to List<obj> in C#

Let's say that we have a dictionary like this

Dictionary<key, List<obj>>

I want to get all values as list like this

List<obj>

e.g. There are 3 keys in dictionary, key1, key2, key3.

2 values for key1
3 values for key2
5 values for key3

result should be one list that has 10 values!

I think it may be done with foreach and ToList(). I hope simpler and more efficient solution.

Upvotes: 2

Views: 107

Answers (2)

YuvShap
YuvShap

Reputation: 3835

Use LINQ SelectMany method:

var list = dictionary.SelectMany(item => item.Value).ToList();

From the docs:

Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence.

All you have to do is to specify the selector - the IEnumerable you want to select for each KeyValuePair, which is obviously the value.

Upvotes: 2

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236188

You can use Values property to get all values from dictionary. And SelectMany linq extension to flatten sequence of lists into sequence of objects:

dictionary.Values.SelectMany(v => v).ToList()

Upvotes: 3

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