C# 2 string arrays to List<string, string>

Question

Assuming the 2 string arrays are the same length and not empty how can I make a List of the contents?

I had a Dictionary working, but now I need to be able to use duplicate keys so I am resorting to a List.

string[] files = svd.file.Split(",".ToCharArray());
string[] references = svd.references.Split(",".ToCharArray());

Dictionary<string, string> frDictionary = new Dictionary<string, string>();

frDictionary = files.Zip(rReferences, (s, i) => new { s, i })
.ToDictionary(item => item.s, item => item.i);

I could do it like:

List<string, string> jcList = new List<string, string>();

and then just have a double loop into the two arrays but I know a faster way must exist.

If you are starting to make up your own types (list doesnt have a string, string overload.) You might as well just make your own class with properties to hold the data. — crthompson
– crthompson, Commented Dec 17, 2014 at 15:53
Maybe List<KeyValuePair<string, string>>? Don't think there is a restriction on unique key, but could be wrong. — Robert
– Robert, Commented Dec 17, 2014 at 15:55
Pete if you want to use something that would be equivalent to List<string, string> then you can use an Immutable Struct C# SO Immutable Struct List<string,string> — MethodMan
– MethodMan, Commented Dec 17, 2014 at 15:57

spender · Accepted Answer · 2014-12-17 15:52:43Z

12

ILookup<string,string> myLookup = 
    files.Zip(rReferences, (s, i) => new { s, i })
         .ToLookup(item => item.s, item => item.i);

will create a Dictionary-like structure that allows multiple values per key.

So

IEnumerable<string> foo = myLookup["somestring"];

answered Dec 17, 2014 at 15:52

spender

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DrKoch · Accepted Answer · 2014-12-17 16:03:34Z

0

A List containing elements with two strings each is simplest implemented with a

List<T>

and

T == Tuple<string,string>

Then use a loop to build your list from the two arrays:

string[] s1 =
{
    "1", "2"
};
string[] s2 =
{
    "a", "b"
};

var jcList = new List<Tuple<string,string>>();

for (int i = 0; i < s1.Length; i++)
{
    jcList.Add(Tuple.Create(s1[i], s2[i]));
}

or using LINQ:

var jcList = s1.Select((t, i) => Tuple.Create(t, s2[i])).ToList();

edited Dec 17, 2014 at 16:03

answered Dec 17, 2014 at 15:57

DrKoch

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4 Comments

Mivaweb Over a year ago

with just code the OP can't understand what you are doing. Add some documentation to it

MethodMan Over a year ago

-1 LOL I totally agree VDesign wow talk about over thinking in my opinion I would not skin my cat this way.. sorry

juharr Over a year ago

FYI instad of new Tuple<string, string>(s1[i], s2[i]) you can use Tuple.Create(s1[i], s2[i]).

DrKoch Over a year ago

please note: with spender's Lookup any search will be (much) faster than with this simple flat List

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