List of Generic Lists

Question

I would like to create a list of objects in which there is a generic list.

So what I have is this object:

public class agieDBColumn where dataTp:IComparable{ private string _header; private string _longHeaderName; private List _data;

public string header { get { return _header; } set { _header = value; } }

public string longHeaderName { get { return _longHeaderName; } set { _longHeaderName = value; } }

public List data { get { return _data; } set { _data = value; } }

}

And this is how I would like to use it:

List columns;

Then I would like to add new instances to the list "columns" specifying the type.

There does not seem to be a syntaxs that allows this though as I get "Error 1 Using the generic type 'Picker.DBColumn' requires '1' type arguments Frm.cs 56 9 FCAgieStratPicker " when trying to define the type of List I would like.

Is this even possible? Or would I need to use the base class object in this case?

Maybe there is a better way to handle the data I would like to represent in memory.

Answer 1

Your type is generic. If you want to create a list of that type you'll need to specify the type for your class as well.

List<agieDBColumn<int>> columns = ...

Answer 2

It seems what you eventually want to achieve is already provided by the System.Data.DataTable class.

Adding columns:

DataTable dataTable = new DataTable();
DataColumn column = dataTable.Columns.Add(header, type);
column.Caption = longHeaderName;

Adding rows:

dataTable.Rows.Add(someIntValue, someStringValue, ...)