I would like create a custom DataRow that will have -let's say- a propery called IsCheapest.
public class RateDataRow : DataRow
{
protected internal RateDataRow(DataRowBuilder builder) : base(builder)
{
}
public bool IsCheapest { get; set ;}
}
And I want to have a new DataTable that contains only ***RateDataRow***s so that .NewDataRow() returns RateDataRow instance as a new row.
what should be the implementation on the class that extends DataTable?
Thanks,
I know this is an old post now but I couldn't get the example above to work. I had a similar problem so was keen to find a solution. After a bit of research I found the following to work:
class Program
{
static void Main(string[] args)
{
MyDataTable t1 = new MyDataTable();
t1.Columns.Add(new DataColumn("Name", typeof(string)));
t1.Columns.Add(new DataColumn("DateOfBirth", typeof(DateTime)));
MyDataRow r1 = t1.NewRow() as MyDataRow;
r1["Name"] = "Bob";
r1["DateOfBirth"] = new DateTime(1970, 5, 12);
t1.Rows.Add(r1);
}
}
[Serializable]
public class MyDataTable : DataTable
{
public MyDataTable()
: base()
{
}
public MyDataTable(string tableName)
: base(tableName)
{
}
public MyDataTable(string tableName, string tableNamespace)
: base(tableName, tableNamespace)
{
}
/// <summary>
/// Needs using System.Runtime.Serialization;
/// </summary>
public MyDataTable(SerializationInfo info, StreamingContext context)
: base(info, context)
{
}
protected override Type GetRowType()
{
return typeof(MyDataRow);
}
protected override DataRow NewRowFromBuilder(DataRowBuilder builder)
{
return new MyDataRow(builder);
}
}
[Serializable]
public class MyDataRow : DataRow
{
public bool MyPropertyThatIdicatesSomething { get; private set; }
public MyDataRow()
: base(null)
{
}
public MyDataRow(DataRowBuilder builder)
: base(builder)
{
}
}