public PagingSourceSelector(IPagingDataSource <TSource> source, Func <IEnumerable <TSource>, IEnumerable <TResult> > pageSelector)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (pageSelector == null)
{
throw new ArgumentNullException("pageSelector");
}
_dataSource = source;
_pageSelector = pageSelector;
}
public PagingSourceSelector(IPagingDataSource <TSource> source, Func <TSource, TResult> selector)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
_dataSource = source;
_selector = selector;
}
/// <summary>
/// 对分页数据源中的每一页进行指定映射操作，得到一个新的分页数据源
/// </summary>
/// <typeparam name="TSource">源分页数据类型</typeparam>
/// <typeparam name="TResult">映射后的类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="pageSelector">映射函数</param>
/// <returns>执行映射操作后的分页数据</returns>
public static IPagingDataSource <TResult> PageSelect <TSource, TResult>(this IPagingDataSource <TSource> source, Func <IEnumerable <TSource>, IEnumerable <TResult> > pageSelector)
{
return(new PagingSourceSelector <TSource, TResult>(source, pageSelector));
}
/// <summary>
/// 对分页数据源中的每一项进行指定映射操作，得到一个新的分页数据源
/// </summary>
/// <typeparam name="TSource">源分页数据类型</typeparam>
/// <typeparam name="TResult">映射后的类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="selector">映射函数</param>
/// <returns>执行映射操作后的分页数据</returns>
public static IPagingDataSource <TResult> Select <TSource, TResult>(this IPagingDataSource <TSource> source, Func <TSource, TResult> selector)
{
return(new PagingSourceSelector <TSource, TResult>(source, selector));
}
