CODEWITHSUNDEEP
c#dictionary
Mohsin Tester
Mohsin Tester

Reputation: 35

Get list values of list from dictionary in C#

I have the following code snippet to add string values to a List and then add the list as the key in a dictionary. Now I want to print both the key and the value from the Dictionary but I'm unable to do so. Any ideas or suggestions will be appreciated. 

Dictionary<List<string>, int> dic = new Dictionary<List<string>, int>();

List<string> mylist = new List<string>();
string[] str = new string[5];
int counter = 0;
for (int i = 0; i < 5; i++)
{
    Console.Write("Type Number:");
    string test = Console.ReadLine();
    mylist.Add(test);
    counter++;
}

Console.WriteLine(string.Join(",", mylist));
dic.Add(mylist, counter);

Upvotes: 1

Views: 10164

Answers (2)

Ian
Ian

Reputation: 30813

If you want to have string as you key (as you indicate by joining the List<string>, then consider making a Dictionary<string,int> instead of Dictionary<List<string>,int>:

Dictionary<string, int> dic = new Dictionary<string, int>(); //note this dict type

List<string> mylist = new List<string>();
string[] str = new string[5];
int counter = 0;
for (int i = 0; i < 5; i++)
{
    Console.Write("Type Number:");
    string test = Console.ReadLine();
    mylist.Add(test);
    counter++;
}

string key = string.Join("", mylist); //note this key combination
//you will have key-value pair such as "12345"-5

Console.WriteLine(string.Join(",", mylist)); //note, you will print as "1,2,3,4,5"
dic.Add(key, counter);

And print it out like what has been shown:

foreach(var v in dic)
    Console.WriteLine(v.Key.ToString() + " " + v.Value.ToString());

Original:

using foreach on each Dictionary element will do the job:

foreach(var v in dic)
    Console.WriteLine(v.Key.ToString() + " " + v.Value.ToString());

The foreach will allow you to iterate over every element in your Dictionary.

Additionally, you may consider to reverse your Dictionary key and value:

Dictionary<int, List<string>> dic = new Dictionary<int, List<string>>();

For it is quite uncommon to call int from List<string>. The Key part of the Dictionary is normally the simpler one. Also, by having a List<string> as Key, you have to have that exact List<string> to call the Value, but having int as you Key will allow you to get List<string> from int pretty easily.

And if you plan to join the List<string> you should use <string,int> or <int,string> rather than <List<string>,int> or <int,List<string>>

Upvotes: 1

Zeus82
Zeus82

Reputation: 6375

Try this 

foreach(var v in dic)
    Console.WriteLine(string.Join("," v.Key) + " " + v.Value.ToString());

Although, it does seem like you have your key and value backwards...

Upvotes: 0

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