public static IEnumerable <IEnumerable <T> > AsPaged <T>(this IEnumerable <T> items,
int pageLength = 10)
{
using (var enumerator = new WrappedEnumerator <T>(items.GetEnumerator()))
while (!enumerator.IsDone)
{
yield return(enumerator.GetNextPage(pageLength));
}
}
/// <summary>Returns an enumerator that iterates through the collection.</summary>
/// <returns>An enumerator that can be used to iterate through the collection.</returns>
public IEnumerator <T> GetEnumerator()
{
var p = Aspect.Context.Promise <IEnumerable <T> >();
ExpressionHashData hash = null;
if (p is Containing <IEnumerable <T> > || p is Demanding <IEnumerable <T> > )
{
hash = Expression.CalculateHash();
}
try
{
if (p is Containing <IEnumerable <T> > c)
{
var td = c.Get(hash.Hash, Description.Description);
return(td.GetEnumerator());
}
var tran = Aspect.Context.GetQueryTransaction();
var originalEnumerator = CreateNewOriginal(hash?.ModifiedExpression).GetEnumerator();
if (p is NotifyCompleted <IEnumerable <T> > nc)
{
nc.Fulfill(Description.Description);
}
if (p is Demanding <IEnumerable <T> > d)
{
var result = new WrappedEnumerator <T>(originalEnumerator, tran);
result.Demands(d, hash.Hash, Description);
return(result);
}
return(originalEnumerator);
}
catch (Exception ex)
{
if (p is Catching <IEnumerable <T> > d)
{
d.Fulfill(ex, Description.Description);
}
throw;
}
}
/// <summary>Returns an enumerator that iterates through the collection.</summary>
/// <returns>An enumerator that can be used to iterate through the collection.</returns>
public IEnumerator GetEnumerator()
{
var p = Aspect.Aux.Promise <IEnumerable <object> >();
if (p is Containing <IEnumerable <object> > c)
{
var td = c.Get(Expression.CalculateHash(), Description.Description);
return(td.GetEnumerator());
}
var tran = Aspect.Aux.GetQueryTransaction();
var originalEnumerator = Original.GetEnumerator();
var result = new WrappedEnumerator(originalEnumerator, tran);
if (p is Demanding <IEnumerable <object> > d)
{
result.Demands(d, Expression.CalculateHash(), Description);
}
return(result);
}
