Mapping of some Data in c#

Question

Hello, i search for a good solution for mapping data in c#.
At first i have a Character "a" and a angle "0.0" degree.
What is the best solution for the Mapping ? A list ?

One requirement is that i must search for the degree if it not in the "list" then i add a new one.. and so on

thanks for help :)

EDIT: I must find out if the angle exists ! If the angle not exists then add a new char

Answer 1

Dictionary< double,char>

Example:

Dictionary< double, char> dic = new Dictionary< double, char>();
//Adding a new item
void AddItem(char c, double angle)
{
    if (!dic.ContainsKey(angle))
        dic.Add(angle,c);
}
//Retreiving an item
char GetItem(double angle)
 {
    char c;
    if (!dic.TryGetValue(angle, out c))
        return '';
    else
        return c;   
 }

Answer 2

Use dictionary.

var d =new Dictionary<string,double> ()`

Answer 3

Dictionary should be fine:

Dictionary<string, float> dict = new Dictionary<string, float>();
dict.Add("a", 0.0);
float angle = dict["a"]
if( !dict.Contains("b"))
{
  dict["b"] = 1.0;
}

Answer 4

Maybe a SortedDictionary...

 private SortedDictionary<string, double> _myStuff;

...

if (!_myStuff.ContainsValue(0))
...