public object Calc(QMathType type, object val1, object val2)
{
if (val1 is string || val2 is string)
{
return("" + val1 + val2);
}
else
{
decimal obj1 = GetDecimal(val1);
decimal obj2 = GetDecimal(val2);
if (type == QMathType.Plus)
{
return(obj1 + obj2);
}
else if (type == QMathType.Minus)
{
return(obj1 - obj2);
}
else if (type == QMathType.Multiply)
{
return(obj1 * obj2);
}
else // if (type == QExpressionMathType.Devide)
{
return(obj2 == 0M ? 0M : obj1 / obj2);
}
}
}
public override string Format(IDbCommand command)
{
StringBuilder rez = new StringBuilder();
for (int i = 0; i < types.Count; i++)
{
QMathType type = types[i];
string mark = " + ";
if (type == QMathType.Minus)
{
mark = " - ";
}
if (type == QMathType.Multiply)
{
mark = " * ";
}
if (type == QMathType.Devide)
{
mark = " / ";
}
if (i == 0)
{
rez.Append(Items[i].Format(command));
}
rez.AppendFormat("{0}{1}", mark, Items[i + 1].Format(command));
}
return(base.Format(command));
}
public override object GetValue(DBItem row)
{
object value = null;
for (int i = 0; i < types.Count; i++)
{
QMathType type = types[i];
object val1 = (i == 0) ? items[i].GetValue(row) : value;
object val2 = items[i + 1].GetValue(row);
value = Calc(type, val1, val2);
}
return(value);
}
