private Expression ApplyThenBy(Expression source, OrderByClause thenByClause)
{
if (thenByClause == null)
{
return(source);
}
Expression e = _visitor.TranslateNode(thenByClause.Expression);
LambdaExpression lambda = Expression.Lambda(e, Parameter);
MethodInfo thenByMethodInfo = thenByClause.Direction == OrderByDirection.Ascending ?
OeMethodInfoHelper.GetThenByMethodInfo(ParameterType, e.Type) :
OeMethodInfoHelper.GetThenByDescendingMethodInfo(ParameterType, e.Type);
MethodCallExpression thenByCall = Expression.Call(thenByMethodInfo, source, lambda);
return(ApplyThenBy(thenByCall, thenByClause.ThenBy));
}
private static MethodInfo GetThenByMethodInfo(OrderByDirection direction, Type sourceType, Type keyType)
{
return(direction == OrderByDirection.Ascending ?
OeMethodInfoHelper.GetThenByMethodInfo(sourceType, keyType) :
OeMethodInfoHelper.GetThenByDescendingMethodInfo(sourceType, keyType));
}