public async Task <IPage <T> > PageAsync(
int pageSize,
byte[] pagingState)
{
byte[] currentPagingState = pagingState;
PagingState ps = pagingState.DeserializePageState();
var records = await RetrieveAllAsync();
var slice = records.Skip(ps.CurrentIndex).Take(pageSize).ToList();
if (slice.Count < pageSize)
{
// we are at the end
pagingState = null;
}
else
{
ps.CurrentIndex += pageSize;
pagingState = ps.Serialize();
}
var page = new PageContainer <T>(currentPagingState, pagingState, slice);
return(page);
}
public static byte[] Serialize(this PagingState pagingState)
{
if (pagingState == null)
{
return(null);
}
var bytes = ZeroFormatterSerializer.Serialize(pagingState);
return(bytes);
}
public static string SerializeToBase64String(this PagingState pagingState)
{
if (pagingState == null)
{
return(null);
}
byte[] bytes = pagingState.Serialize();
var psString = Convert.ToBase64String(bytes);
return(psString);
}
public static PagingState DeserializePageStateFromBase64String(this string psString)
{
if (string.IsNullOrEmpty(psString))
{
return new PagingState()
{
CurrentIndex = 0
}
}
;
var bytes = Convert.FromBase64String(psString);
PagingState pagingState = bytes.DeserializePageState();
return(pagingState);
}
}