private Func <object, object> Converter(ReflectionFieldDefinition reflectionFieldDefinition)
{
//will build Lambda Expression to convert value and compile and cache on field defintion
Delegate del;
Type t = reflectionFieldDefinition.FieldType;
if (t == typeof(string))
{
return(o =>
{
if (o == null ||
o == DBNull.Value)
{
return null;
}
return o.ToString();
});
}
if (t == typeof(int))
{
return(o => { return Convert.ToInt32(o); });
}
return(null);
}
public T MapItem <T>(ReflectedEntityKey key, EntityFetchExpression fetchExpression, IDataReader dataReader)
where T : IEntity
{
IEntityDefinition definition = _entityDefinitionProvider.GetEntityDefinition(key);
T entity = (T)definition.GenerateEntity();
IReadOnlyList <IFieldDefinition> fields = fetchExpression.Fields(_entityDefinitionProvider);
for (var i = 0; i < fields.Count; i++)
{
ReflectionFieldDefinition fieldDefinition = (ReflectionFieldDefinition)fields[i];
Field field = fieldDefinition.GetField(entity);
var valueConverter = Converter(fieldDefinition);
field.Value = valueConverter(dataReader.GetValue(i));
}
return(default(T));
}