/// <summary>
/// Returns a pager which allows entities to be paged.
/// </summary>
/// <param name="sortSelector"> Required sorting criteria. </param>
/// <param name="pageSize"> The desired page size. </param>
/// <param name="predicate"> Optional predicate to filter the paged entities. </param>
/// <param name="fetchOptions">Optional delegate to specify additional fetching options.</param>
/// <returns>
/// <see cref="IPager{T}" /> which allows the entities to be paged.
/// </returns>
public IPager <T> Pager(ISortSelector sortSelector, int pageSize, Expression <Func <T, bool> > predicate = null,
Action <IFetchOptions <T> > fetchOptions = null)
{
if (sortSelector == null)
{
throw new ArgumentNullException("sortSelector");
}
var query = GetFindQuery(predicate, null, fetchOptions);
return(new Pager <T>(query, sortSelector, pageSize));
}
/// <summary>
/// Returns a pager which allows shaped entities to be paged.
/// </summary>
/// <param name="selector"> The selector used to shape the entities. </param>
/// <param name="pageSize"> The desired page size. </param>
/// <param name="sortSelector"> Required sorting criteria. </param>
/// <param name="predicate"> Optional predicate to filter the paged entities. </param>
/// <param name="fetchOptions">Optional delegate to specify additional fetching options.</param>
/// <typeparam name="TResult"> The shape of the result. </typeparam>
/// <returns>
/// <see cref="IPager{T}" /> which allows the shaped entities to be paged.
/// </returns>
public IPager <TResult> Pager <TResult>(Func <IQueryable <T>, IQueryable <TResult> > selector, int pageSize,
ISortSelector sortSelector, Expression <Func <T, bool> > predicate = null,
Action <IFetchOptions <TResult> > fetchOptions = null)
{
if (selector == null)
{
throw new ArgumentNullException("selector");
}
if (sortSelector == null)
{
throw new ArgumentNullException("sortSelector");
}
var query = GetFindQuery(selector, predicate, null, fetchOptions);
// If TResult is not an entity type, then the query strategy must be set to DataSourceOnly
// otherwise the EntityQueryPager doesn't return any data. This appears to be a bug in DevForce.
if (!EntityManager.IsEntityType(typeof(TResult)))
{
query = query.With(QueryStrategy.DataSourceOnly);
}
return(new Pager <TResult>(query, sortSelector, pageSize));
}
public Pager(IEntityQuery <T> baseQuery, ISortSelector sortSelector, int pageSize)
{
_entityQueryPager = EntityQueryPager.Create(baseQuery, sortSelector, pageSize);
}