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I want to create a Dictionary of <string, Dictionary> type where the inner Dictionary is of type <string, List<string>>.

I wrote the following code for that :

using System.IO ; 

using System.Collections ; 

using System.Collections.Generic ; 



class nm {

    public static void Main () {

        Dictionary<string, Dictionary<string, List<string>>> dicdic = new Dictionary<string, Dictionary<string, List<string>>>();

        Dictionary<string, List<string>> fr = new Dictionary<string, List<string>>();

        Dictionary<string, List<string>> subdicdic = new Dictionary <string , List<string>>() ; 

        List<string> p = new List<string>(); 

        p.Add("bro, you feel me ") ;

        subdicdic.Add(new KeyValuePair<string, List<string>>("ll", p)); 

        fr.Add(new KeyValuePair("foo", subdicdic)) ;

    }

}

But on trying to compile it with csc in windows command prompt , I am getting a compilation error at line 18 which is the following :

 fr.Add(new KeyValuePair("foo", subdicdic)) ;

stating the following :

"No overload for method 'Add' takes '1' arguments "

I surfed up for similar questions on c# and I got the following question :

Why am i getting "No overload method for Add takes 1 argument" when adding a Dictionary to a List of Dictionaries

But after going through this I am getting a feel there might be some restriction for using list variable name in place of the list . But I am not sure .

I went through the following question too :

Adding a key value pair in a dictionary inside a dictionary

Although the above might help in getting an alternative solution for the purpose code that I am trying to write .

But for now I want to know what stops me from adding this list as a value for the dictionary .

The version details of my compiler :

Microsoft (R) Visual C# 2005 Compiler version 8.00.50727.8922
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50727

What might be the issue here ?
How to operate with a dictionary having an internal dictionary with list in .net 2.0 ?

The short answer, you are trying to use an overload of a method that does not exist.

The Add method on a the Dictionary<T1, T2> class does not support passing in a KeyValuePair<T1, T2> directly. The only pattern available via the Add method is Add(T1 key, T2 value);.

You need to change this line: subdicdic.Add(new KeyValuePair<string, List<string>>("ll", p)); to subdicdic.Add("ll", p);

I should note that you will experience the exact same issue on the very next line and will need to make a similar adjustment.

For your reference, I have created a working .NET Fiddle example of this problem.

Did you try this way:

using System.IO;

using System.Collections;

using System.Collections.Generic;



class nm

{

    public static void Main()

    {

        var dicdic = new Dictionary<string, Dictionary<string, List<string>>>();

        var subdicdic = new Dictionary<string, List<string>>();

        var p = new List<string>();

        p.Add("bro, you feel me ");

        subdicdic.Add("ll", p);

        dicdic.Add("foo", subdicdic);

    }

}