A dictionary object that uses ranges of values for keys

Question

I have need of a sort of specialized dictionary. My use case is this: The user wants to specify ranges of values (the range could be a single point as well) and assign a v

Answer 1

i adapted some ideas for Dictionary and func, like "ChaosPandion" gave me the idea in his earlier post here above. i still solved the coding, but if i try to refactor
i have a amazing problem/bug/lack of understanding:

Dictionary, double> map = new Dictionary, double>()
{
        { (a, b) => a == "2018" && b == 4, 815.72},
        { (a, b) => a == "2018" && b == 6, 715.72}
};

What is does is, that i call the map with a search like "2018"(year) and 4(month), which the result is double value 815,72. When i check the unique map entries they look like this:

map working unique keys

so thats the orginal behaviour, anything fine so far. Then i try to refactor it, to this:

Dictionary, double> map = 
new Dictionary, double>();

WS22(map, values2018, "2018");



private void WS22(Dictionary, double> map, double[] valuesByYear, string strYear)
{
          int iMonth = 1;


             // step by step this works:
             map.Add((a, b) => (a == strYear) && (b == 1), dValue);
             map.Add((a, b) => (a == strYear) && (b == 2), dValue);



           // do it more elegant...
           foreach (double dValue in valuesByYear)
           {

             //this does not work: exception after second iteration of foreach run
              map.Add((a, b) => (a == strYear) && (b == iMonth), dValue );
              iMonth+=1; 
          }
}

this works: (i use b==1 and b==2)

this does not work (map not working exception on add item on second iteration)

so i think the problem is, that the map does not have a unique key while adding to map dictionary. The thing is, i dont see my error, why b==1 is working and b==iMonth not.

Thx for any help, that open my eyes :)