// Evaluate is for interpretation (and is relatively slow)
public object Evaluate(Report rpt, Row row)
{
// get the results
object[] argResults = new object[_Args.Length];
int i = 0;
bool bUseArg = true;
bool bNull = false;
foreach (IExpr a in _Args)
{
argResults[i] = a.Evaluate(rpt, row);
if (argResults[i] == null)
{
bNull = true;
}
else if (argResults[i].GetType() != _ArgTypes[i])
{
bUseArg = false;
}
i++;
}
// we build the arguments based on the type
Type[] argTypes = bUseArg || bNull? _ArgTypes: Type.GetTypeArray(argResults);
// We can definitely optimize this by caching some info TODO
// Get ready to call the function
Object returnVal;
object inst = _Rc.Instance(rpt);
Type theClassType = inst.GetType();
MethodInfo mInfo = XmlUtil.GetMethod(theClassType, _Func, argTypes);
if (mInfo == null)
{
throw new Exception(string.Format("{0} method not found in class {1}", _Func, _Cls));
}
returnVal = mInfo.Invoke(inst, argResults);
return(returnVal);
}
