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Asked: 2026-05-23T07:31:49+00:00

I’m fairly new to C# and I come from a Ruby background. I still

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I’m fairly new to C# and I come from a Ruby background. I still have a lot to learn and that’s why I’m asking the following question:

Goal:
1) I would like to create a Dictionary with string as keys and whatever object type I want as values. Something like this:

Dictionary<string, T>

2) But That’s not all. I also want a “Master” Dictionary with string as keys and the Dictionary described above as values.
Something like this:

Dictionary<string, Dictionary<string T>>

I want it to be that way so I can work like the example below:

MasterDictionary[Dict1].Add( Thing1 )
MasterDictionary[Dict2].Add( Thing2 )

Current Code:
I’m trying to achieve this using the following code

public List<string> DataTypes;
public Dictionary<string, Dictionary<string, object>> TempData;
public Dictionary<string, Dictionary<string, object>> GameData;

public Session()
        {   
            // Create a list of all Data Types.
            DataTypes = new List<string>();
            DataTypes.Add("DataInfo");
            DataTypes.Add("Maps");
            DataTypes.Add("Tilesets");

            // Create and populate TempData dictionary.
            TempData = new Dictionary<string, Dictionary<string, object>>();
            TempData.Add("DataInfo", new Dictionary<string, DataInfo>());
            TempData.Add("Maps", new Dictionary<string, Map>());
            TempData.Add("Tilesets", new Dictionary<string, Tileset>());

            // Create GameData dictionary and copy TempData into it.
            GameData = new Dictionary<string, object>(TempData);
        }

Problem:
I get the following errors

1)The best overloaded method match for ‘System.Collections.Generic.Dictionary>.Add(string, System.Collections.Generic.Dictionary)’ has some invalid arguments

2)Error 10 Argument 1: cannot convert from ‘System.Collections.Generic.Dictionary>’ to ‘System.Collections.Generic.IDictionary’

The following lines are underlined in red

TempData.Add("DataInfo", new Dictionary<string, DataInfo>());
TempData.Add("Maps", new Dictionary<string, Map>());
TempData.Add("Tilesets", new Dictionary<string, Tileset>());

// Create GameData dictionary and copy TempData into it.
GameData = new Dictionary<string, object>(TempData);

I clearly did something wrong or even illegal here, I just need to know what it is and how I could fix it!

I’ve been doing a lot of research on my own but found nothing that could help me on this.
I’ve seen how to make a dictionary of dictionaries but I’m not quite sure how to tell a dictionary not to care about the object type in Value.

I know “T” might be of some use here but I don’t really know how to use it since it always tells me “The type or namespace name ‘T’ could not be found”

So what should I do?

Thanks in advance
– Sasha

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1 Answer

  1. Editorial Team

    The problem is that you aren’t matching your typedefs with the objects you create. Change your code to this:

    public void Session()
{
    // Create a list of all Data Types.
    DataTypes = new List<string>();
    DataTypes.Add("DataInfo");
    DataTypes.Add("Maps"); 
    DataTypes.Add("Tilesets");

    // Create and populate TempData dictionary.
    TempData = new Dictionary<string, Dictionary<string, object>>();
    TempData.Add("DataInfo", new Dictionary<string, object>());
    TempData.Add("Maps", new Dictionary<string, object>());
    TempData.Add("Tilesets", new Dictionary<string, object>());

    // Create GameData dictionary and copy TempData into it.
    GameData = new Dictionary<string, Dictionary<string, object>>(TempData);
}
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