C# get array from dictionary with respect to other array

Question

I have data like:

Dictionary<string, string> dic = new Dictionary<string, string>();    
dic.Add("1", "ABC1");    
dic.Add("2", "ABC2");    
dic.Add("3", "ABC3");    
dic.Add("4", "ABC4");    
dic.Add("5", "ABC5");    
dic.Add("6", "ABC6");  
string[] col = new string[] { "1", "4", "5" };

needed a result string array in the same order as col array like:

string[] res = new string[] { "ABC1", "ABC4", "ABC5" };

tried with for loop but needed in linq

string[] res = new string[col.Length]; // { "ABC1", "ABC4", "ABC5" };

for(int i=0;i<col.Length;i++)
{
    res[i] = dic[col[i]];
}

Hint: LINQ's Select and ToArray methods make this very simple. — Jon Skeet
– Jon Skeet, Commented Oct 14, 2016 at 10:14
I see a LINQ tag but no evidence that you tried to solve this with LINQ? — Master Yoda
– Master Yoda, Commented Oct 14, 2016 at 10:15

Gilad Green · Accepted Answer · 2016-10-14 10:17:02Z

9

The unsafe way is just to Select directly from dictionary:

var result = col.Select(c => dic[c]).ToArray();

But it is more recommended to check that the key is in the dictionary to avoid exception

var result = col.Where(c => dic.Keys.Contains(c))
                .Select(c => dic[c])
                .ToArray();

answered Oct 14, 2016 at 10:17

Gilad Green

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Comments

Andrei Olariu · Accepted Answer · 2016-10-14 10:22:11Z

0

Try this:

var result = dic.Where(k => col.Contains(k.Key)).Select(v => v.Value).ToArray();

answered Oct 14, 2016 at 10:22

Andrei Olariu

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2 Comments

chanti Over a year ago

string[] col = new string[] { "1", "5", "4" }; if col array is like this then result is still lke { "ABC1", "ABC4", "ABC5" }; but i want { "ABC1", "ABC5", "ABC4" };

Andrei Olariu Over a year ago

Right. Then @GiladGreen's answer should do it.

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