Question

I have class called GroupItem, i can store any type here say int, string, decimal, datetime etc.., Then, i have GroupItems which will store any groupItem. I’m using an arraylist to store all the groupItem.

public class GroupItem<T>
{
    private string heading;
    private List<T> items = new List<T>();

    public GroupItem() { }

    public string Heading
    {
        get { return heading; }
        set { heading = value; }
    }

    public List<T> Items
    {
        get { return items; }
        set { items = value; }
    }

    public void Add(T value)
    {
        this.items.Add(value);
    }

    public T this[int index]
    {
        get
        {
            return this.items[index];
        }
    }
}

public class GroupItems
{
    private string groupName;
    private List<object> items = new List<object>();

    public string GroupName
    {
        get { return groupName; }
        set { groupName = value; }
    }

    public GroupItems() { }

    public void Add(object value)
    {
        this.items.Add(value);
    }

    public object this[int index]
    {
        get
        {
            return this.items[index];
        }
    }
}

I want to retrieve from GroupItems. How i can get generic item’s values in groupItems?

I’m now inserting two items, datetime and int to groupitems. Now i want to retrieve groupitems[2] value but how i can convert this to groupItem without knowing what it is. Even we may get its genericarguments by getType().getGenericarguments()[0]. But how i can create an instance based upon that.

Answer 1

Thanks for your inputs.

I have resolved it myself using multiple overloading methods to resolve this.

for example:

private void Print(GroupItem<string> items)
{
///custom coding
}
private void Print(GroupItem<int> items)
{
///custom coding
}

Though its not efficient enough, i want to do in this way as it was .net 2.0.

I’m now improving this in .Net 4.0 with new algorithm.

Thanks a lot for all of your helps.