public override object Eval(object row, object context)
{
object component = context;
if (this.parent != null)
{
component = this.parent.Eval(row, context);
}
else if ("Fields" == this.name)
{
return(row);
}
if (component == null)
{
return((object)null);
}
IDataItem dataItem = row as IDataItem;
if (dataItem != null)
{
return(dataItem[this.name]);
}
PropertyDescriptor propertyDescriptor = (PropertyDescriptor)null;
Type type = component.GetType();
if (!this.properties.TryGetValue(type, out propertyDescriptor))
{
PropertyDescriptorCollection descriptorCollection = !(component is IDataDescriptor) ? TypeDescriptor.GetProperties(component) : ((IDataDescriptor)component).GetProperties();
if (descriptorCollection != null && descriptorCollection.Count > 0)
{
bool ignoreCase = !(context is ExpressionContext) || !((ExpressionContext)context).CaseSensitive;
this.properties[type] = propertyDescriptor = descriptorCollection.Find(this.name, ignoreCase);
}
}
if (propertyDescriptor != null)
{
return(propertyDescriptor.GetValue(component));
}
throw InvalidExpressionException.UndefinedObject(this.name);
}
public override object Eval(object row, object context)
{
object o = context;
if (null != this.parent)
{
o = this.parent.Eval(row, context);
}
else if (NameNode.FildsObject == this.name)
{
return(row);
}
if (null == o)
{
return(null);
}
IDataItem map = row as IDataItem; //changed from IDataMap
if (null != map)
{
return(map[this.name]);
//// The "old" field notation when there was no Fields global object
//// and fields was referenced by thier name only; ex. =ProductCategory
//// instead of =Fields.ProductCategory
//try
//{
// return map[this.name];
//}
//catch (Exception)
//{
// // hide this exception; UndefinedObject will be raised after that
//}
}
PropertyDescriptor property = null;
Type objectType = o.GetType();
// Sometimes one expression may be evaluated on a different
// type of data. Because of the caching of the expression trees
// two expression (ex. the report's filters and a textbox
// in the group header) may result in a single exp tree. The different
// input data (same ex. - the filter operates with DataObject while
// for the group sections is passed DataGroup objects) will result
// in a different PropertyDescriptor, so we need to chache them
// per object type.
if (!this.properties.TryGetValue(objectType, out property))
{
PropertyDescriptorCollection collection = null;
if (o is IDataDescriptor)
{
collection = ((IDataDescriptor)o).GetProperties();
}
else
{
collection = TypeDescriptor.GetProperties(o);
}
if (null != collection && collection.Count > 0)
{
this.properties[objectType]
= property
= collection.Find(this.name, true);
}
}
if (null != property)
{
return(property.GetValue(o));
}
throw InvalidExpressionException.UndefinedObject(this.name);
}
