/// <summary>
/// Initializes a new instance of the <see cref="LinqPagedMetadata{TSource}"/> class.
/// </summary>
/// <param name="items">The items.</param>
/// <param name="criteria">The criteria.</param>
/// <exception cref="System.ArgumentNullException">
/// items
/// or
/// criteria
/// </exception>
public LinqPagedMetadata(IEnumerable <TSource> items, LinqPagedCriteria criteria)
{
Items = (items ?? throw new ArgumentNullException(nameof(items))).Count();
Criteria = criteria ?? throw new ArgumentNullException(nameof(criteria));
TotalItems = criteria.TotalItemsAccessor?.Invoke() ?? Items;
Index = criteria.Index;
Pages = TotalItems > 0 ? (int)Math.Ceiling(TotalItems / (decimal)Criteria.PageSize) : 1;
HasOverflowedShowAll = Criteria.ShowAll && Items < TotalItems;
EnsureVisiblity();
}
public LinqPagedMetadata(IEnumerable <TSource> items, LinqPagedCriteria criteria)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
if (criteria == null)
{
throw new ArgumentNullException("criteria");
}
Criteria = criteria;
Items = items.Count();
var totalItemsAccessor = criteria.TotalItemsAccessor;
TotalItems = (totalItemsAccessor == null ? Items : totalItemsAccessor());
Index = criteria.PageIndex;
Pages = (TotalItems > 0 ? (int)Math.Ceiling(TotalItems / (decimal)Criteria.PageSize) : 1);
HasOverflowedShowAll = ((Criteria.ShowAll) && (Items < TotalItems));
EnsureVisiblity();
}
/// <summary> /// Gets the metadata. /// </summary> /// <typeparam name="TSource">The type of the t source.</typeparam> /// <param name="source">The source.</param> /// <param name="criteria">The criteria.</param> /// <returns>IPagedMetadata.</returns> public abstract IPagedMetadata GetMetadata <TSource>(IEnumerable <TSource> source, LinqPagedCriteria criteria);
public static IPagedList <TSource> ToPagedList <TSource>(this IEnumerable <TSource> source, LinqPagedCriteria criteria)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
return(ToPagedList(source.AsQueryable(), criteria));
}
public static TSource[] ToPagedArray <TSource>(this IEnumerable <TSource> source, LinqPagedCriteria criteria, out IPagedMetadata pagedMeta)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
return(ToPagedArray(source.AsQueryable(), criteria, out pagedMeta));
}
public override IPagedMetadata GetMetadata <TSource>(IQueryable <TSource> source, LinqPagedCriteria criteria)
{
return(new LinqPagedMetadata <TSource>(source, criteria));
}
public static IPagedList <TSource> ToPagedList <TSource>(this IQueryable <TSource> source, LinqPagedCriteria criteria)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (criteria == null)
{
throw new ArgumentNullException("criteria");
}
var meta = LinqPagedMetadataProviders.Current.GetMetadata <TSource>(source, criteria);
int pageSize = criteria.PageSize;
int index = meta.Index;
if (meta.TotalItems > 0)
{
return(new PagedList <TSource>((index == 0 ? source.Take(pageSize) : source.Skip(index * pageSize).Take(pageSize)), meta));
}
return(new PagedList <TSource>(meta));
}
public static TSource[] ToPagedArray <TSource>(this IQueryable <TSource> source, LinqPagedCriteria criteria, out IPagedMetadata meta)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (criteria == null)
{
throw new ArgumentNullException("criteria");
}
meta = LinqPagedMetadataProviders.Current.GetMetadata <TSource>(source, criteria);
int pageSize = criteria.PageSize;
int index = meta.Index;
if (meta.TotalItems > 0)
{
return(new Buffer <TSource>(index == 0 ? source.Take(pageSize) : source.Skip(index * pageSize).Take(pageSize)).ToArray());
}
return(new TSource[] { });
}
/// <summary> /// Gets the metadata. /// </summary> /// <typeparam name="TSource">The type of the source.</typeparam> /// <param name="source">The source.</param> /// <param name="criteria">The criteria.</param> /// <returns></returns> public override IPagedMetadata GetMetadata <TSource>(IEnumerable <TSource> source, LinqPagedCriteria criteria) => new LinqPagedMetadata <TSource>(source, criteria);
public override IPagedMetadata GetMetadata <TSource>(IQueryable <TSource> source, LinqPagedCriteria criteria)
{
throw new NotSupportedException();
}
/// <summary>
/// To the paged array.
/// </summary>
/// <typeparam name="TSource">The type of the t source.</typeparam>
/// <param name="source">The source.</param>
/// <param name="criteria">The criteria.</param>
/// <param name="metadata">The metadata.</param>
/// <returns>TSource[].</returns>
/// <exception cref="System.ArgumentNullException">
/// source
/// or
/// criteria
/// </exception>
public static TSource[] ToPagedArray <TSource>(this IEnumerable <TSource> source, LinqPagedCriteria criteria, out IPagedMetadata metadata)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (criteria == null)
{
throw new ArgumentNullException(nameof(criteria));
}
metadata = LinqPagedMetadataProviders.Current.GetMetadata(source, criteria);
var pageSize = criteria.PageSize;
var index = metadata.Index;
return(metadata.TotalItems > 0
? new Buffer <TSource>(index == 0 ? source.Take(pageSize) : source.Skip(index * pageSize).Take(pageSize)).ToArray()
: new TSource[] { });
}
