/// <summary>
/// Sorts the elements of a sequence in ascending order according to a key.
/// </summary>
/// <typeparam name="TKey">The type of the key returned by the function that is represented by keySelector.</typeparam>
/// <param name="keySelector">A function to extract a key from an element.</param>
/// <returns>A new query instance containing all specified query parameters</returns>
public IOrderedQuery <T> OrderBy <TKey>(Expression <Func <T, TKey> > keySelector)
{
var expression = _expressionTranslator(keySelector);
var sortExpression = new Expressions.SortExpression(expression, Expressions.SortDirection.Ascending);
var query = new Query <T>(_dataProvider, _expressionTranslator, FilterExpressions, new[] { sortExpression }, SkipValue, TakeValue);
return(query);
}
/// <summary>
/// Performs a subsequent ordering of the elements in a sequence in descending order, according to a key.
/// </summary>
/// <typeparam name="TKey">The type of the key returned by the function represented by keySelector.</typeparam>
/// <param name="keySelector">A function to extract a key from each element.</param>
/// <returns>A new query instance containing all specified query parameters</returns>
IOrderedQuery <T> IOrderedQuery <T> .ThenByDescending <TKey>(Expression <Func <T, TKey> > keySelector)
{
if (!SortExpressions.Any())
{
throw new InvalidOperationException("No sorting defined yet, use OrderBy or OrderByDescending first.");
}
var expression = _expressionTranslator(keySelector);
var sortExpression = new Expressions.SortExpression(expression, Expressions.SortDirection.Descending);
var sortExpressions = SortExpressions.ToList();
sortExpressions.Add(sortExpression);
var query = new Query <T>(_dataProvider, _expressionTranslator, FilterExpressions, sortExpressions, SkipValue, TakeValue);
return(query);
}
public static IOrderedDataServiceQueryable <TEntity, TBase> OrderBy <TEntity, TBase>(this IDataServiceQueryable <TEntity, TBase> queriable, RLinq.SortExpression expression) where TEntity : TBase where TBase : Entity
{
var newQueriable = new OrderedDataServiceQueryable <TEntity, TBase>((DataServiceQueryable <TEntity, TBase>)queriable);
newQueriable.Sortings.Clear();
newQueriable.Sortings.Add(new DataServiceQueryable <TEntity, TBase> .Sort(expression));
return(newQueriable);
}
