C# generic function, unable to convert

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I have this C# function

C#

internal static SortedList<string, string> doSList(string list)
        {
            SortedList<string, string> ret = new SortedList<string, string>();

            char[] charSeparators = new char[] { '|' };
            string[] l1 = list.Split('|');
            if (l1.Count() > 0)
            {
                foreach (string ll1 in l1)
                {
                    string[] l2 = ll1.Split(';');

                    if (l2.Count() == 2)
                    {
                        {
                            //ret.Add(Convert.ChangeType(l2[0], typeof(key)), Convert.ChangeType(l2[1], typeof(value)));
                            ret.Add(l2[0], l2[1]);
                        }
                    }
                }
            }
            return ret;
        }

then I require sometime later:

C#

internal static SortedList<string, int> doSList2(string list)

What I have tried:

So I did it , but VB.net fellow was able to do

VB

Friend Shared Function doSList(Of key, value)(ByVal list As String) As SortedList(Of key, value)

but I am not able to do :

C#

internal static SortedList<TKey, TValue> doSList2(string list)

Error says TKey not found, TValue not found, then I tried with T only, then T not found.

it may be newbie question, please somebody guide me to this, any link where to learn?

Posted 15-Dec-23 16:59pm

VijayShimpi,Dharwad

Updated 16-Dec-23 0:35am

v4

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[no name] 16-Dec-23 0:27am

That's not a good candidate for "generics".
https://stackoverflow.com/questions/9808035/how-do-i-make-the-return-type-of-a-method-generic

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George Swan · Accepted Answer · 2023-12-15T22:20:00

Assuming that the Key is always a string as the input has a comma separated value format; something along these lines should do the trick.

C#

public static SortedList<string, TValue> DoSList<TValue>(string csv) where TValue : IConvertible
  {
    SortedList<string, TValue> target = new ();
     string[] firstSplitArray = csv.Split('|');
      if (firstSplitArray.Length > 0)
       {
        foreach (string t1Instance in firstSplitArray)
         {
          string[] secondSplitArray = t1Instance.Split(';');

          if (secondSplitArray.Length == 2)
           {
            {
              var result= (TValue)Convert.ChangeType(secondSplitArray[1], typeof(TValue));
              target.Add(secondSplitArray[0], result);
            }
           }
         }
       }
     return target;
   }

It can be used like this:-

C#

string testStr = "Y;5|X;6|W;7|V;8|A;1|B;2|C;3|D;4";
 SortedList<string, int> sortedList = DoSList<int>(testStr);
 foreach (var kvp in sortedList)
 Console.WriteLine($"{kvp.Key}:{kvp.Value}");