private static Func <T> CreateActivatorDelegate()
{
var constructor = typeof(T).GetConstructor(Type.EmptyTypes);
// No parameterless constructor found.
if (constructor == null)
{
return(() => { throw MappingException.NoParameterlessConstructor(typeof(T)); });
}
return(Expression.Lambda <Func <T> >(Expression.New(constructor)).Compile());
}
public T Map(IDataRecord record, IEnumerable <string> columns)
{
var instance = _factory();
foreach (var column in columns)
{
if (_properties.TryGetValue(column, out var property))
{
try {
property.SetValue(instance, record[column]);
} catch (InvalidCastException e) {
throw MappingException.InvalidCast(column, e);
}
}
}
return(instance);
}