List of Lists with different type

Question

I want to add Lists with different types to a list. This is my approach:

struct Column
{
    public string title;
    public List<dynamic> col;
}

var signals = new List<Column>();
signals.Add(new Column {title = "stringCol", col = new List<string>() });
signals.Add(new Column {title = "doubleCol", col = new List<double>() });

It says that List<string> can't be converted to List<dynamic>. I also tried using templates, but I didn't get it running.

Answer 1

Use object instead of dynamic, you will have list of object which you can later cast to desired type.

struct Column
{
    public string title;
    public List<object> col;
}

var signals = new List<Column>();
signals.Add(new Column {title = "stringCol", col = new List<object> {new List<string>() }});
signals.Add(new Column {title = "doubleCol", col = new List<object> {new List<double>() }});

Why not dynamic? read here: dynamic vs object type

Abstract:

If you use dynamic you're opting into dynamic typing, and thus opting out of compile-time checking for the most part.

So it means dynamic type will be calculated at runtime and it does not mean "any type" it means "some type defined at runtime"