I have List
List<string> listOfAtt = new List<string>();
where listOfAtt[0] = "FirsName", listOfAtt[1] = "Homer" etc.
How can I create a Dictionary<srting,string> of this kind
listOfAtt["FirsName"] = "Homer"???
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So the first two values are a key value pair, then the next two, the next two, yadda yadda...?Arran– Arran2013-07-30 13:44:08 +00:00Commented Jul 30, 2013 at 13:44
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Yes, that's what I want to do.Sashko Chehotsky– Sashko Chehotsky2013-07-30 13:45:34 +00:00Commented Jul 30, 2013 at 13:45
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1What is the use case here? Are the values in the list unique? The below answers all do not take duplicates into account and will all fail if e.g. "FirsName" is twice in the list at an even index.enzi– enzi2013-07-30 13:47:26 +00:00Commented Jul 30, 2013 at 13:47
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The values that should be keys are unique, so those answers I accept=)Sashko Chehotsky– Sashko Chehotsky2013-07-30 13:55:32 +00:00Commented Jul 30, 2013 at 13:55
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3 Answers
Assuming listOfAtt.Count is even and items at even indices are unique you can do below.
Dictionary<string,string> dic = new Dictionary<string,string>();
for (int i = 0; i < listOfAtt.Count; i+=2) {
dic.Add(listOfAtt[i], listOfAtt[i + 1]);
}
Assuming uniqueness of keys, a LINQ-y way to do it would be:
Enumerable.Range(0, listOfAtt.Count / 2)
.ToDictionary(x => listOfAtt[2 * x], x => listOfAtt[2 * x + 1]);
If things are not so unique, you could extend this logic, group by key and return a Dictionary<string, List<string>> like:
Enumerable.Range(0, listOfAtt.Count / 2)
.Select(i => new { Key = listOfAtt[2 * i], Value = listOfAtt[2*i+1] })
.GroupBy(x => x.Key)
.ToDictionary(x => x.Key, x => x.Select(X => X.Value).ToList());
2 Comments
Simon Belanger
Nice use of
Enumerable.Range
Sashko Chehotsky
Thanks a lot! But I'll probably use loop)
The best way to do this is probably using a for loop
Dictionary<string,string> dict = new Dictionary<string,string>();
for (int i = 0; i < listOfAtt.Count; i+=2){
dict.Add(listOfAtt[i], listOfAtt[i+1]);
}
2 Comments
Lance U. Matthews
new Dictionary<string,string> should be new Dictionary<string,string>();, listOfAtt.count should be listOfAtt.Count, and dict.add should be dict.Add.
Dan Drews
@Bacon Correct :) I use vb.net primarily so I usually don't worry much about case-sensitivitiy or parentheseis