public Expression ApplyOrderBy(Expression source, OrderByClause orderByClause)
{
if (orderByClause == null)
{
return(source);
}
Expression e = _visitor.TranslateNode(orderByClause.Expression);
LambdaExpression lambda = Expression.Lambda(e, Parameter);
MethodInfo orderByMethodInfo = orderByClause.Direction == OrderByDirection.Ascending ?
OeMethodInfoHelper.GetOrderByMethodInfo(ParameterType, e.Type) :
OeMethodInfoHelper.GetOrderByDescendingMethodInfo(ParameterType, e.Type);
MethodCallExpression orderByCall = Expression.Call(orderByMethodInfo, source, lambda);
return(ApplyThenBy(orderByCall, orderByClause.ThenBy));
}
private static MethodInfo GetOrderByMethodInfo(OrderByDirection direction, Type sourceType, Type keyType)
{
return(direction == OrderByDirection.Ascending ?
OeMethodInfoHelper.GetOrderByMethodInfo(sourceType, keyType) :
OeMethodInfoHelper.GetOrderByDescendingMethodInfo(sourceType, keyType));
}