Cast DataRow To Custom Class That Inherits DataRow

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Good day all!!!

I have a DataTable that I'm looping through:

C#

foreach (DataRow r in table.Rows)
{
}

I also have a class that inherits DataRow:

C#

public class OutlookDataRow : System.Data.DataRow
{
    public OutlookGridRow OutlookRow { get; set }

    public OutlookDataRow(System.Data.DataRowBuilder builder)
       : base(builder)
    {
    }
}

How would I go about casting DataRow r to OutlookDataRow as it loops through the DataTable???

Doing any of the follow throws a casting error:

C#

OutlookDataRow dr = r;

OutlookDataRow dr = (OutlookDataRow)r;

OutlookDataRow dr = r as OutlookDataRow;

foreach (OutlookDataRow r in table.Rows)
{
}

Posted 7-Aug-13 23:41pm

azinyama

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OriginalGriff · Accepted Answer · 2013-08-08T00:02:00

You can't - you cannot cast "up" the inheritance tree as the system would have to "invent" information for new items in the derived class. Since it doesn't have a clue what you added or what you want to do with it, it won't even try.

The best solution is probably to define a constructor for your derived class which takes a DataRow as the parameter and constructs a new OutlookDataRow based on that information.