How To Compare 2 lists of Strings using for each

Question

I am trying to loop through 2 lists using this code

foreach (string str1 in list<string>tags)
{ 
    foreach (string str2 in list<string>ArchivedInformation) { }
}

The first list has tags which is stored as "tag1, tag2,tag3.." and the second list has information stored as "tag1, Datestamp, 0.01","tag2, datestamp, 0.02" and so on.

I would like to ask how can I get the Tags in the second list and use it as a condition to my first for each? I have tried splitting the second list but i am cannot get the exact "Tag1" as an id to use it as a condition.

In the end the goal I would want to do is Str1(from tags list) == Str2(From Archivedinformation).

Just Want to know, is this doable using just only Dictionary? or it can be done using a list as well — Eman
– Eman, Commented Sep 26, 2014 at 18:06
Are you familiar with Dictionaries? It's a data structure that contains a list of keys and associated values. I would structure your data so the tags are dictionary keys and the ArchivedInformation values are the dictionary values. You wouldn't need to have the tag in the value, so it would just be like "Datestamp, 0.01". You could use a Dictionary<string, List<string>>. I'm not really sure I understand what you are actually trying to do with your foreach loop, though. It seems like you are just trying to associate the data, and if you weren't using two lists you might not even need to. — eddie_cat
– eddie_cat, Commented Sep 26, 2014 at 18:08
Yes i am actually accessing 2 lists at the same time as it is the current design of the system. but definitely a dictionary is something i need to look at its just that their preference is to access 2 lists and compare the id's on both of them. much thanks! — Eman
– Eman, Commented Sep 26, 2014 at 18:19

Mikko Viitala · Accepted Answer · 2014-09-26 18:21:54Z

1

Everything's possible. Other thing is if it's even sane :)

    public void Something()
    {
        // Using Dictionary
        var dict = new Dictionary<string, string>();
        dict.Add("tag1", "tag1,datestamp,0.01");
        dict.Add("tag2", "tag2,datestamp,0.02");

        // out -> "tag2,datestamp,0.02"            
        System.Diagnostics.Debug.WriteLine(dict["tag2"]);    


        // Using two separate lists
        var tags = new List<string> { "tag1", "tag2" };
        var infos = new List<string> { "tag1,datestamp,0.01", "tag2,datestamp,0.02" };

        // out ->  tag1,datestamp,0.01 & tag2,datestamp,0.02
        tags.ForEach(tag =>
            System.Diagnostics.Debug.WriteLine(
                infos.First(info => info.StartsWith(tag)))); 
    }

answered Sep 26, 2014 at 18:21

Mikko Viitala

8,4044 gold badges42 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Eman Over a year ago

thanks! i tried to use this function as well string cmp; cmp = str2.Substring(0,str2.IndexOf(','));

Collectives™ on Stack Overflow

How To Compare 2 lists of Strings using for each

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related