public override object Evaluate(IExpressionContext context)
{
Func <object[], object> unknownFunction = context != null?context.ResolveFunction(FunctionName) : null;
if (unknownFunction != null)
{
object[] funcArgs;
if (Arguments != null && Arguments.Length > 0)
{
funcArgs = new object[Arguments.Length];
for (int i = 0; i < Arguments.Length; i++)
{
funcArgs[i] = Arguments[i].Evaluate(context);
}
}
else
{
funcArgs = new object[0];
}
return(unknownFunction(funcArgs));
}
throw new InvalidOperationException("A function specified in the expression (" + FunctionName +
") does not exist.");
}