C# nested dictionaries

c#, dictionary, nested

Solution

You cannot define a class field using `var`.

Change `var` to `Dictionary<string, Dictionary<string, string>>`:

public Dictionary<string, Dictionary<string, string>> info =
    new Dictionary<string, Dictionary<string, string>>
    {
        {
            "Gen",
            new Dictionary<string, string>
            {
                {"name", "Genesis"},
                {"chapters", "50"},
                {"before", ""},
                {"after", "Exod"}
            }
        },
        {
            "Exod",
            new Dictionary<string, string>
            {
                {"name", "Exodus"},
                {"chapters", "40"},
                {"before", "Gen"},
                {"after", "Lev"}
            }
        }
    };

See here for more information about `var` keyword and its usage.

In C# 9, with the introduction of target-typed new expressions, you can rewrite the field definition as:

public Dictionary<string, Dictionary<string, string>> info = new()
{
    {
        "Gen",
        new Dictionary<string, string>
        {
            {"name", "Genesis"},
            {"chapters", "50"},
            {"before", ""},
            {"after", "Exod"}
        }
    },
    {
        "Exod",
        new Dictionary<string, string>
        {
            {"name", "Exodus"},
            {"chapters", "40"},
            {"before", "Gen"},
            {"after", "Lev"}
        }
    }
};

Problem

Original source