dotnet clr: Hello.

(I don't know if this is the right newsgroup to post this message, so sorry
if I'm cross-posting).

I am writing a base class which has an abstract property of some type. This
property must be overrided and have different return types at base classes,
as follows:

public abstract class NumericTextBox : TextBox
{
public abstract ValueType Value
{
get;
}
}

public class DecimalTextBox : NumericTextBox
{
public override Decimal Value
{
get
{
return 123;
}
}
}

public class DoubleTextBox : NumericTextBox
{
public override Double Value
{
get
{
return 123;
}
}
}

I know the previous code won't work. Anyway, how can I do that? What's the
right way to do that?

Thank you in advance.

Celio Cidral Junior
WEG Eletric
Brazil

You could box it and return an Object, then unbox it when you need to use
it. C# will implicitly box a value type to a reference type, but you must
explicitly unbox it.

public abstract class NumericTextBox
{
public abstract Object Value
{
get;
}
}

public class DecimalTextBox : NumericTextBox
{
public override Object Value
{
get
{
return (decimal)123;
}
}
}

public class DoubleTextBox : NumericTextBox
{
public override Object Value
{
get
{
return 123.123d;
}
}
}


public class Test
{
public static void Main()
{
NumericTextBox box1 = new DecimalTextBox();
NumericTextBox box2 = new DoubleTextBox();
Object[] values = new Object[2];
values[0] = box1.Value;
values[1] = box2.Value;
for (int i=0; i < values.Length; i++)
{
if (values[i] is System.Decimal)
{
Decimal decimalValue = (decimal)values[i];
Console.WriteLine("Value " + i + " is decimal value " +
decimalValue);
}
else if (values[i] is System.Double)
{
Double doubleValue = (double)values[i];
Console.WriteLine("Value " + i + " is double value " +
doubleValue);
}
else
{
Console.WriteLine("Value " + i + " is unknown type " +
values[i]);
}
}
}
}