// 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 bNull = false;
foreach (IExpr a in _Args)
{
argResults[i] = a.Evaluate(rpt, row);
if (argResults[i] == null)
{
bNull = true;
}
i++;
}
Type[] argTypes;
if (bNull)
{
// Need to put fake values in that match the types
object[] tempResults = new object[argResults.Length];
for (int ix = 0; ix < argResults.Length; ix++)
{
tempResults[ix] =
argResults[ix] == null?
XmlUtil.GetConstFromTypeCode(_Args[ix].GetTypeCode()) :
argResults[ix];
}
argTypes = Type.GetTypeArray(tempResults);
}
else
{
argTypes = Type.GetTypeArray(argResults);
}
// We can definitely optimize this by caching some info TODO
// Get ready to call the function
object returnVal;
Type theClassType = Type.GetType(_Cls, true, true);
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(theClassType, argResults);
return(returnVal);
}